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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: Thu Mar 29, 2018 12:08 pm    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

My computer and photobucket have both been going nuts, so please bare with me. Since I am having so much trouble posting pictures, I'll post what I can and if you have any questions, just ask!

Factory bolt face -







This shows the front of the Remington action with their "grinding" marks on it -




Action set up for the truing process -







The face of the action was NOT square and one lug set .004 higher than the other! So then the bolt was in battery, it was sitting .004 high and above center! Not good!







When I turned the barrel between centers for threading, I always cut the threads .0015 over size so I can lap the barrel and action threads together. There is "0" play between the barrel and action threads...







I replaced the factory firing pin and spring with a much lighter weight firing pin, and a heavier firing pin spring. I also turned the firing pin tip to where it is .0005 smaller that the firing pin hole. The assembly shown here is less than half the weight of the factory firing pin and spring...




For whatever reason, my pictures keep getting thrown out of order, So I hope you'll understand...


More pictures to follow within the next couple of days...


Last edited by Deer Sniper on Mon Jul 02, 2018 8:58 am; edited 3 times in total
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stovepipe
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Joined: Sep 25, 2008
Posts: 4877
Location: Pine, Az.

PostPosted: Thu Mar 29, 2018 12:15 pm    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

Awesome sauce as always d-dub!

Tier-1 chip-maker at the helm!

Wow!
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Vince
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Joined: May 25, 2005
Posts: 13659
Location: Brisbane AUSTRALIA

PostPosted: Thu Mar 29, 2018 5:41 pm    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

That is outstanding work mate...no way I would ever be able to even think about doing that sort of work. Admittedly I’m not trained in “fitting and turning”, but your work is more that of a high grade artisan than a tradesman.

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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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Azar
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Joined: Jan 04, 2010
Posts: 273
Location: Utah

PostPosted: Fri Mar 30, 2018 11:55 am    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

Thank you for the explanations (with pics!). Looks great.
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Deer Sniper
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Joined: Apr 26, 2007
Posts: 475
Location: Oklahoma

PostPosted: Fri Mar 30, 2018 2:46 pm    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

Thanks again for the compliments guys, I appreciate the kind words...

A little more information on the barrel, since I have asked about it several times.

It is a Bartlein barrel, stainless steel, 5R rifling, the breech end is 1.250" for 5 inches, then it tapers down to 1.00" at the muzzle at 32". The barrel will be cut to 30" and I'll add one of my muzzle brakes, making the overall length 31 1/2"...

Customer requested that the muzzle brake be left oversize, and I just finished making a 1 1/4" diameter brake that will be threaded onto the barrel after I cut and crown it...

And the bi-pod, that is mine and does NOT go with the rifle...

If everything goes according to plan, I'll have more pictures first of next week...

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Precision Riflesmith LLC / (918) 576-3217 / Custom Gun Work
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Elvis
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Joined: Jul 27, 2008
Posts: 7578
Location: south island New Zealand

PostPosted: Mon Apr 02, 2018 1:08 am    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

looks great,enjoying this thread very much.

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Deer Sniper
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Joined: Apr 26, 2007
Posts: 475
Location: Oklahoma

PostPosted: Tue Apr 03, 2018 4:22 pm    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

I set the action up "between centers" so I could re-drill and tap the base holes to the larger 8-40 screws...

Then I modified the base for the larger screws as well...

And last, since my customer wanted the muzzle brake to be left oversize, I made one for this build that is 1.250" in diameter. I went ahead and made 2 more brakes that are 1" in diameter, since I already had everything set up on the milling machine...












More to follow in the next couple of days...


Last edited by Deer Sniper on Mon Jul 02, 2018 9:08 am; edited 3 times in total
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Deer Sniper
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Joined: Apr 26, 2007
Posts: 475
Location: Oklahoma

PostPosted: Tue Apr 03, 2018 4:36 pm    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

Two Custom Encore barrels that I built and put muzzle brakes on. One is chambered in 308 Winchester and the other one is a 6mm Bench Rest...


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By HIS stripes, we are healed!
.

Precision Riflesmith LLC / (918) 576-3217 / Custom Gun Work
.
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Elvis
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Joined: Jul 27, 2008
Posts: 7578
Location: south island New Zealand

PostPosted: Wed Apr 04, 2018 12:40 am    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

keepem coming Mate.

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You shot it You pluck it !
Them who eats the most duck eats the most feathers!
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Deer Sniper
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Joined: Apr 26, 2007
Posts: 475
Location: Oklahoma

PostPosted: Wed Apr 04, 2018 3:19 pm    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

Before cutting the barrel and adding one of my muzzle brakes, I went and test fired the gun before proceeding any further.

Starting off with new Norma brass in 280 Remington, the case is expanded to .35 caliber, then necked down to .30 caliber to create a secondary shoulder, loaded and fired in the guns chamber, you now have what I call my 300 Jr.. Neck length is .220...




I'll take the gun back apart tomorrow, cut the barrel to 30", thread it, crown it and add a muzzle brake...

_________________
By HIS stripes, we are healed!
.

Precision Riflesmith LLC / (918) 576-3217 / Custom Gun Work
.


Last edited by Deer Sniper on Mon Jul 02, 2018 9:44 am; edited 1 time in total
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Vince
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Joined: May 25, 2005
Posts: 13659
Location: Brisbane AUSTRALIA

PostPosted: Wed Apr 04, 2018 6:25 pm    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

This is looking absolutely brilliant mate. The work on the Encore barrels...and...dang...all of it, is extremely high grade and flawless. I owned a TC Contender 10” BBL in 30.30 Win some years ago and loved it tremendously. I seriously considered buying a carbine barrel and stock for it, but it was cost prohibitive at the time. I damn near cried when I handed it in to the Police. One day I might be able to find the money to buy a TC single shot rifle.

I like the look of your .300 Jnr...an interesting calibre. How does it compare to the .308 and 30.06 rounds?

_________________
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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Joined: Apr 26, 2007
Posts: 475
Location: Oklahoma

PostPosted: Wed Apr 04, 2018 8:10 pm    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

Thank you Vince!!!

The 300 Jr. betters the 308 and 30-06 by a good 300 fps...

With bullets up to 180 grains, it matches or beats standard factory loadings for the 300 Win. Mag...

_________________
By HIS stripes, we are healed!
.

Precision Riflesmith LLC / (918) 576-3217 / Custom Gun Work
.
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hunterjoe21
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Joined: Mar 30, 2007
Posts: 1413
Location: Billings, Montana

PostPosted: Wed Apr 04, 2018 8:56 pm    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

What about dies for the Junior?

You got me thinking now...

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Deer Sniper
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Joined: Apr 26, 2007
Posts: 475
Location: Oklahoma

PostPosted: Thu Apr 05, 2018 5:59 am    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

I make hand dies for the 300 Jr., that I cut with the same reamer that I use to cut the chamber. The size die uses interchangeable neck bushings...

For bullet seating, the customer has the choice of using a Hornady .30 caliber universal bullet seater or a hand die that is cut with the same reamer, then have a micrometer bullet seater...

If you are interested in me building you a rifle chambered in 300 Jr, send me your address and I will send you a fireformed case...

_________________
By HIS stripes, we are healed!
.

Precision Riflesmith LLC / (918) 576-3217 / Custom Gun Work
.
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Azar
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Joined: Jan 04, 2010
Posts: 273
Location: Utah

PostPosted: Thu Apr 05, 2018 8:09 am    Post subject: Re: Building a long-range rifle in 300 Jr. Reply with quote

What's the case capacity of the 300 Jr.?
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