View previous topic :: View next topic |
Author |
Message |
shrpshtrjoe Super Red Neck Member
Joined: Jan 26, 2005 Posts: 2965 Location: Maryland
|
|
Back to top |
|
|
Blaine Member
Joined: Feb 24, 2005 Posts: 260 Location: Maine
|
Posted: Mon Mar 07, 2005 4:15 am Post subject: Re: Max Overall Cartridge Length |
|
Hello again,
My method is probably way too complicated and cumbersome, but I know it works. The first thing I do is measure the magazine to see what my maximum OAL can be. then I subtract .030" from that to ensure that there will be no problems feeding rounds into my chamber. This gives me my "drop dead" (absolute longest) OAL. I then take a "fire-formed" case from my gun and crush the neck VERY slightly so that it will hold a bullet. Next I start a bullet into the case just enough so that it stays there. Take a black "magic marker" and completely paint the exposed bullet. I then carefully load the shell into the chamber and close the bolt. (Don't trip the trigger or your measurement will be way off.) Open the bolt slowly and remove the round. If the bullet is still in the case, check for rifling marks. If they are present, the lands have seated your bullet so just simply mike the round and subtract the amount you want the bullet to set off the lands, and that is your OAL. (At this point, if there are no rifling marks, the throat is too long to use your rifling as a measuring point. Simply use the "drop dead" OAL you calculated above as your OAL. ) If the bullet is stuck in the rifling, gently tap it out with a cleaning rod from the muzzle end. Without wiping off the ink, stick the bullet back into the case and push it down just to where the ink line is . Proceed as you did above (Be sure to subtract the amount you want the bullet to set off the lands) and you have your OAL. Compare this OAL to the "drop dead" OAL you calculated above to be sure you're not exceeding it and you're good to go. I then adjust my bullet seating die and using an un-primed case, I seat a bullet to this exact OAL and write on the side of the case the OAL & exact bullet used. I then set aside this "dummy round" for future reference. There, is that clear as mud?
P.S. I have been thinking about getting a Stoney Point OAL gauge, but at this point I've got most of my AOL's established, so I'm not sure it will pay for itself.
Blaine
_________________ Shoot straight and above all shoot SMART....and remember God is still in control !!!!
Last edited by Blaine on Mon Mar 07, 2005 2:47 pm; edited 1 time in total |
|
Back to top |
|
|
BenB Rookie Member
Joined: Feb 01, 2005 Posts: 10
|
|
Back to top |
|
|
Knifeboy Member
Joined: Feb 09, 2005 Posts: 165 Location: The Arizona desert
|
Posted: Mon Mar 07, 2005 1:52 pm Post subject: Re: Max Overall Cartridge Length |
|
Well Blane,
Sounds like you really took some time to figure this whole thing out.
Thanks for the info on this both of you.
Knifeboy
|
|
Back to top |
|
|
Coyote_Hunter_ Member
Joined: Mar 05, 2005 Posts: 208 Location: Franktown, CO
|
Posted: Thu Mar 10, 2005 1:46 pm Post subject: Re: Max Overall Cartridge Length |
|
It varies by gun. Some I just seat to the cannelure and crimp. (.375 Win, .44 Mag, some .45-70). Some loads for my Marlin .45-70 are determined by the maximum length that will cycle from the magazine to the chamber and then eject. Others I use a Stoney point OAL gauge (.22-250, .257 Roberts, 7mm Mag). My new Ruger .300 Win Mag has such a long throat I seat as far out as I can for the magazine.
_________________ Coyote Hunter
NRA, GOA, DAD |
|
Back to top |
|
|
calsibley Super Member
Joined: Jan 28, 2005 Posts: 317
|
Posted: Fri Mar 11, 2005 9:05 am Post subject: Re: Max Overall Cartridge Length |
|
I also use the Stoney Point OAL guage and like it. There is a slight learning curve involved, but you catch on quickly. The secret appears to be in using a light touch. Don't push hard to get the bullet tight into the lands or pressures can skyrocket on you. With todays rifle chambering I find there are some rifles where you can't even begin to touch the lands. You'd think the manufacturers had never even heard of SAAMI, muchless adher to their guidelines.
I think you have to remember that not all rifles shoot best with the bullets into the lands. Some seem to prefer a jump to the lands. I never worry about a round being too long to clear the magazine. Most of my shooting is at the range, and I load everything single shot anyway. Best wishes.
Cal - Montreal
|
|
Back to top |
|
|
WildHorse Member
Joined: Feb 17, 2005 Posts: 184 Location: Nebraska
|
Posted: Fri Mar 11, 2005 4:10 pm Post subject: Re: Max Overall Cartridge Length |
|
Ditto on the Stoney Point Gauge. I couldn't live without mine.
_________________ It is dangerous to be right when the government is wrong.
- Voltaire (1694- 1778) |
|
Back to top |
|
|
shrpshtrjoe Super Red Neck Member
Joined: Jan 26, 2005 Posts: 2965 Location: Maryland
|
Posted: Sun Mar 20, 2005 3:50 am Post subject: Re: Max Overall Cartridge Length |
|
Howdy. Just ordered the stoney point gauge. My method works well just takes more time, but it seems im turning into the reloading center for all my buddies, and the stoney point gauge should be quicker than my method and should eliminate any second guess's
_________________ "MOLON LABE"
P E T A
People Eating Tasty Animals |
|
Back to top |
|
|
calsibley Super Member
Joined: Jan 28, 2005 Posts: 317
|
Posted: Mon Mar 21, 2005 12:19 pm Post subject: Re: Max Overall Cartridge Length |
|
Hello Joe,
There's nothing wrong with the method you originally described. Many reloaders use it and are quite satisfied. This can be a frustrating task though because all bullets simply aren't the same length. I've noticed a difference even in the same box. It shouldn't matter much though since the length is only critical to the ogive. I've also got the RCBS Precision Mic for a couple of calibers but rarely use it any more. Isn't it amazing the variety of stuff we end up with for reloading? When I pass on and leave all this stuff to my son I imagine he'll spend many an evening just sitting there scratching his head in wonderment. Best wishes.
Cal - Montreal
|
|
Back to top |
|
|
shrpshtrjoe Super Red Neck Member
Joined: Jan 26, 2005 Posts: 2965 Location: Maryland
|
Posted: Mon Mar 21, 2005 7:20 pm Post subject: Re: Max Overall Cartridge Length |
|
Howdy cal. I agree i am comfortable with the method i described but as i load more for other people i would feel better with the stoney point gauge the last thing i want to do is get it wrong. I think the gauge will eliminate any doubt.
_________________ "MOLON LABE"
P E T A
People Eating Tasty Animals |
|
Back to top |
|
|
BillPa Member
Joined: Mar 17, 2005 Posts: 89
|
Posted: Wed Mar 23, 2005 9:02 am Post subject: Re: Max Overall Cartridge Length |
|
I use the Stoney Point tool with a few modifications. I make my own inserts bored .002" under the bullet ogive to get hopefully a more accurate measurement. Another trick is to use two gages, one on the bullet ogive and one on the base to accurately measure the bearing length of the bullets. You can sort bullets based on this measurement.
In addition to the bullet inserts, I also make some in 27,30 and 40 degrees to measure the headspace so I can bump the shoulders back .001". Its not a actual measurement, but a realitive one that I record for each rifle.
Anyone wanting to modify their own cases, the thread is 5/16-36. You can get the taps from MSC and use a .297" bit to drill out the primer pocket. The necks can be opened up using some 320-400 paper.
|
|
Back to top |
|
|
shrpshtrjoe Super Red Neck Member
Joined: Jan 26, 2005 Posts: 2965 Location: Maryland
|
Posted: Wed Mar 23, 2005 3:13 pm Post subject: Re: Max Overall Cartridge Length |
|
Howdy Bill. Welcome to huntingnut. Thanx for the tips. My gauge should be here tommorow and i will see how it does.
_________________ "MOLON LABE"
P E T A
People Eating Tasty Animals |
|
Back to top |
|
|
shrpshtrjoe Super Red Neck Member
Joined: Jan 26, 2005 Posts: 2965 Location: Maryland
|
Posted: Fri Mar 25, 2005 12:48 pm Post subject: Re: Max Overall Cartridge Length |
|
Howdy. Got my stoney point gauge and tried it out . Much quicker and easier than my other method i can't believe i waited this long to get one. Much impressed with it.
_________________ "MOLON LABE"
P E T A
People Eating Tasty Animals |
|
Back to top |
|
|
slamfire Rookie Member
Joined: Feb 07, 2005 Posts: 19
|
Posted: Sat Mar 26, 2005 11:32 pm Post subject: Re: Max Overall Cartridge Length |
|
I use a flat based bullet inserted into the case point first. After chambering it gives an accurate head to land measurement.
|
|
Back to top |
|
|
Blaine Member
Joined: Feb 24, 2005 Posts: 260 Location: Maine
|
Posted: Sun Mar 27, 2005 8:13 pm Post subject: Re: Max Overall Cartridge Length |
|
Slamfire,
How do you use this "head to lands" measurement after you find it? Won't this measurement be different for each different bullet depending on the ogive? Do you use another gauge (StoneyPoint or similar) to find your OAL for each different bullet? I've been considering a Stoney Point, but don't want to invest in all those "modified cases".
Blaine
_________________ Shoot straight and above all shoot SMART....and remember God is still in control !!!! |
|
Back to top |
|
|
|