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Building a long-range rifle in 300 Jr.
Discussions related to Guns and Firearms
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Deer Sniper
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Joined: Apr 26, 2007
Posts: 475
Location: Oklahoma

PostPosted: Fri Mar 23, 2018 7:08 pm    Post subject: Building a long-range rifle in 300 Jr. Reply with quote

Okay guys, as promised, here is the start of a new build. This rifle will be chambered in 300 Jr., which is a cartridge I designed and developed...

Here is a little history on the 300 Jr.:

I designed and developed this cartridge in 1994 as a tribute to my dad. The first rifle I built and chambered in the 300 Jr., was to be a gift to my dad, and when I completed the build, he wanted me to shoot a deer at 1,000 yds. with it. So, I did a complete load development on this gun and when all was said and done, 300 yard groups averaged just under an inch, 600 yard groups averaged around 2 1/4 inches and 1,000 yard groups averaged around 5 inches. Understand that I am a deer hunter and not a target shooter in any way...

I shot this gun to the maximum limit of my rifle range, which was 1,380 yards long. It use to be a place where crop dusting planes landed many years earlier. The scope stayed sighted in to strike point of aim at 600 yards, and was dialed in, in 50 yard increments, from 600 yards to 1,380 yards. All of this took place just before deer season in 1994. I had also shot a lot of deer at my shooting range, but not too many that were past the 1,000 yard mark...

Early one morning, a couple weeks into deer season, I was setting at my shooting bench, waiting for a deer to walk out into my shooting lane. While waiting for a deer to show up, 2 gentlemen showed up and identified their selves, and asked me what I was doing. I don't remember their names, but one was a Federal Game Warden and the other was local. I told them I had planned on shooting a deer at long range, and I was waiting on one to step out. They looked my rifle over, asked a bunch of questions, and asked if they could record me shooting a deer. I told them they could, only as long as I got a copy of the tape. They agreed, got their equipment out, and waited with me...

We waited and talked for probably an hour or so, and a deer finally showed up. The Game Wardens were watching through my spotting scope and binoculars. The range was 1,118 yards, and I thought the deer was closer to my range marker than what it actually was. There was "0" wind to contend with, so I dialed my scope in at 1,100 yards. I got settled in behind the gun, put the cross hairs at the top point of the front shoulder, and very gently touched the 6 oz. trigger until the gun fired. The deer just stood there, and I was heartbroken. Probably a good 10 seconds went by, and the legs just buckled under that deer, and it dropped straight down. Then another long 5 seconds went by, and the deer laid over on its side. One deer down, a perfect shot and we got it on film!

While the guys were congratulating me, one of them kept looking through the spotting scope, and said - there's another deer!

They were still set up to record, and asked if I would or could shoot another deer. I said yes, looked where it was standing, and it was next to the tree line, at the very end of my range, 1,380 yards away! I dialed my scope in, let my pulse rate slow down, and began the trigger pull. Cross hairs were on the top point of the front shoulder, and about 4 seconds later, this deer dropped and never moved a muscle! I asked the guys if they were able to record it, and they did...

About a month later, the local Game Warden came by my house, and brought a video of the 2 long shots that I had made. We ate dinner and watched that video 3 times! I was so proud of that video and wanted to pay the Warden for it, but he said the experience of watching those shots was all the payment he needed!

I had sent the video to my dad for him to watch, and it was a couple of weeks later before I got in a good enough gun case to ship that gun off in. I called my dad and told him his gun would be shipped off as soon as I got it ready, and it would ship out in a couple of days. Talk about excited!!! I had everything laid out and had just put the rifle in it's case, when the phone rang. My sister called, and said our dad just passed away....

So needless to say, this build means a lot to me, and in a lot of different ways. It will be a slow build, because everything has to perfect, and if I cannot do it to absolute best of my ability, I won't do it!

A big thank you to my customer for the opportunity to build this rifle and thank you for allowing me to post pictures along the way...

My 300 Jr., it is based on a maximized 280 Remington case with minimum body taper, a 40 degree shoulder angle and a short neck...

My furthest shot to date was with a 300 Jr. rifle that I built, and the range was 1,862 yards.. A shot that I will never be able to duplicate!


The action is a Remington 700 long action that will be set up as a single shot and will be blue-printed to match specifications...

The barrel is a Bartlein .30 caliber / 1-10" twist rate / 32" length / finish length will be 30" plus the addition of one of muzzle brakes, for an overall length of 31 1/2"...

The stock is a McMillan MBR with a 3" wide forend...





Some of the accessories that go with this build: Oversize recoil lug / lightweight firing pin with heavy duty firing pin spring / steel scope base with .040 taper / base and action will be modified for the larger 8-40 screws / steel trigger guard with new action screws / single shot follower that will be glued in the bottom of the action / trigger that will be adjusted and set to 10 oz. per customer request...





More to follow as work starts and progresses...


Last edited by Deer Sniper on Tue Jul 03, 2018 7:17 am; edited 6 times in total
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Deer Sniper
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Joined: Apr 26, 2007
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Location: Oklahoma

PostPosted: Fri Mar 23, 2018 7:11 pm    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

Once my gauge was set up, the chamber end of the barrel was dialed in at two different points. One point was at the breech face, and the second point was 3 inches inside the bore. The barrel was dialed in, in a 4 jaw chuck, and a spider was used on the outboard end of the lathe to help keep everything in perfect alignment, and to keep the muzzle end of the barrel from flopping around. Once everything was dialed in to my satisfaction, the dial gauge did not even quiver when the barrel was spun at 200 or 700 rmp...




I used a boring bar to cut the bolt recess in the barrel, and started roughing in the chamber...








The reason for the blue shop towel around the barrel, is because I could not get my camera to focus on anything but the lathe chuck. After adding the paper towel, the camera was able to focus better...


Last edited by Deer Sniper on Mon Jul 02, 2018 8:51 am; edited 3 times in total
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Elvis
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Location: south island New Zealand

PostPosted: Fri Mar 23, 2018 7:28 pm    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

wow Im loving this one already...... even more so as its .30 cal and not an imitation 7mm the .284 lads have been crowing too much lately.
so I guess its pretty close/similar to a .30/06 Ackley improoved???
what projectiles were you using at that extreme range????

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Vince
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PostPosted: Fri Mar 23, 2018 7:33 pm    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

Mate, your story bought a tear to my eye for more reasons than one. I planned on taking my Dad on a rabbit hunt, but he passed away about a week or more before the planned trip.

By the way, outstanding shooting to bag both those deer, and even better with a calibre designed by yourself in honour of your Dad.

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Illegitimi non carborundum
(Never let the bastards grind you down)

Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God.

"Nulla Si Fa Senza Volonta."
(Without Commitment, Nothing Gets Done)
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Deer Sniper
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Location: Oklahoma

PostPosted: Fri Mar 23, 2018 7:33 pm    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

The first 2 deer were shot with Hornady's 168 gr. A-MAX...

My furthest shot was with Hornady's 178 gr. A-MAX...

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Deer Sniper
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PostPosted: Fri Mar 23, 2018 7:36 pm    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

Thank you Vince!

I'm sorry you missed out on that rabbit hunt with your dad.

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Precision Riflesmith LLC / (918) 576-3217 / Custom Gun Work
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Vince
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PostPosted: Fri Mar 23, 2018 7:39 pm    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

It is my belief that Hornady are currently producing the best “standard everyday” projectile on the market today. Both my Weatherby .243 and Savage Axis .223 shoot the V-Max and Z-Max with good authority.

The A-MAX is an even better projectile, but they are expensive over here and the V-Max meets my needs brilliantly.

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Cheers, Vince Cheers

Illegitimi non carborundum
(Never let the bastards grind you down)

Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God.

"Nulla Si Fa Senza Volonta."
(Without Commitment, Nothing Gets Done)
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Deer Sniper
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Location: Oklahoma

PostPosted: Fri Mar 23, 2018 7:42 pm    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

I'll post more pictures of the build as it progresses...

I finished cutting the chamber today, and started blue printing the action. I'll get back on it Monday, and try to post a couple more pictures that night...


Vince - those two guns and my 30-284 are the only guns I have shot, that shot Hornady bullets accurately. At the time, I knew that those A-MAX bullets were the only bullets on the market that would expand on deer at those ranges...


Last edited by Deer Sniper on Fri Mar 23, 2018 7:47 pm; edited 1 time in total
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Vince
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PostPosted: Fri Mar 23, 2018 7:43 pm    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

Deer Sniper wrote:
Thank you Vince!

I'm sorry you missed out on that rabbit hunt with your dad.

Thanks mate...it happens, and I know that there was one thing my Dad enjoyed more than a good feed of fresh caught ocean fish, and that is a nice succulent rabbit backstrap on the BBQ. I really miss him and it’s been near enough 10 years now.

I’ll be following your build closely mate...the love and workmanship you will instill in this rifle will make it something really special.

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Cheers, Vince Cheers

Illegitimi non carborundum
(Never let the bastards grind you down)

Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God.

"Nulla Si Fa Senza Volonta."
(Without Commitment, Nothing Gets Done)
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Elvis
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PostPosted: Fri Mar 23, 2018 7:47 pm    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

Vince...they are eggzachary the same,just the tip is different depending on calibre the zmax are either v max or a max and some are even closer to a sst.
dont let price fool you. I use the zmax 50 grn in my .223...naaasty.

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stovepipe
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PostPosted: Mon Mar 26, 2018 10:31 am    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

THIS is why I come here.

Real shooter and a Real Gun Maker.

No Bullonee!

D-Dub, as always, you are truly such a grounded and heart-felt genuine person.

And, a Tier 1 "Chips Maker".

I love how, why and what you have done with your life, and how many other's life's have been enriched through/by you.

NEVER STOP!

Thanks, man.

-k.
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Azar
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PostPosted: Mon Mar 26, 2018 1:13 pm    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

Very cool indeed.

I love reading build threads like this, and the backstory with your father makes it all the more meaningful.

Thanks for sharing it with us.
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Azar
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PostPosted: Mon Mar 26, 2018 1:14 pm    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

Oh, and a quick question if you don't mind.

What exactly does "blue printing an action" entail?
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Deer Sniper
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PostPosted: Mon Mar 26, 2018 2:20 pm    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

I am on a late lunch break, so I though I would stop by for a minute or two...

I appreciate the kind words from you guy, and I am very humbled by them. Thank you again...

Blue printing basically makes a $400 mass produced action comparable to a $1,200 custom action. With factory actions being mass produced, they need a lot of attention to make them like what they should have had in the first place.

The face of the action is trued to the centerline of the action, so when a barrel is installed, the chamber will be in perfect alignment with bolt face, and the barrel will sit centered in a stock, instead of being cocked to one side or another...

The bolt face is cut true, so there will be 100% contact with the cartridge case head...

The circumference of the bolt nose is trued, as well as the outer diameter and front of the locking lugs. This all allows for a more precise fit of the barrel when it is screwed onto the action...

The back of the barrel lugs are recut then lapped to there is a minimum of 80% contact between the bolt and the action. This keeps the bolt from being cocker off to one side when the gun is fired...

All of these improvements help the gun to achieve it's highest accuracy potential. Of course this is also dependent upon the shooters skills and his ability at the loading bench...

No matter how precise I build a gun, if the one behind the trigger does not know what he is doing, then nothing I can do is going to help...

On the other hand though, put one of my rifles in the hands of a man that knows how to shoot, reload and is very dedicated, then things get very interesting very fast. An accurate rifle with a man that knows to use it, is a sight to behold!

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Precision Riflesmith LLC / (918) 576-3217 / Custom Gun Work
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Vince
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PostPosted: Mon Mar 26, 2018 6:33 pm    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

Elvis wrote:
Vince...they are eggzachary the same,just the tip is different depending on calibre the zmax are either v max or a max and some are even closer to a sst.
dont let price fool you. I use the zmax 50 grn in my .223...naaasty.

Yes mate. I checked with Hornady on the difference between the VMax and ZMax and they openly said the only difference is the colour to cater to the “zombie fad”.

My Savage Axis performs very well with the 55gr V/ZMax bullets.

_________________
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Illegitimi non carborundum
(Never let the bastards grind you down)

Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God.

"Nulla Si Fa Senza Volonta."
(Without Commitment, Nothing Gets Done)
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