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Shep Magnum Primers Question

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Shep Magnum Primers Question

Postby Marauder 1 » Fri Sep 20, 2013 10:57 pm

Hey Shep I remember you posted I think it was in your 1000 yard thread about you were using magnum primers in your rounds and thought you might be over pressurizing the case and rifle.

I meant to ask you was there any evidence in the case of this? i.e. bulged primers etc. I don't see why chouldn't be able to use magnum primers if you reduce your load by at least 10 percent. I know my NRA reloading class said it's a No No due to over pressures. I have only found one source for pressure data and that is in a very expensive reloading manual by A Squared. I did remember reading in your post where it through your shots was off quite a bit.

This is a very interesting article on primer pressure
PRIMERS AND PRESSURE

Anyway I'd love to start this discussion it seems there could be some valuable info to be had.

Seeya
Mark
“Americans have the right and advantage of being armed – unlike the citizens of other countries whose governments are afraid to trust the people with arms.” (James Madison, The Federalist Papers #46 at 243-244)
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Re: Shep Magnum Primers Question

Postby Shepard » Sat Sep 21, 2013 8:25 am

OK -- to start -- this Pet Load that I shoot was given to me by Ken from Rock Solid. It is not something I invented. The first time I ordered I called it in and we talked for about 25 minutes.

The Load 52gr - 56gr of IMR4350 under a .311 - 174gr SMK with a standard primer. I shoot a .308 - 175gr bullet and 54gr load out of my 26 inch barrel gives me 2600-2625 FPS.

I was up to Bens house and we were shooting 400 yards. I was shooting my normal load. 20 rounds I shot and had to add 5 inches of elevation to be on target. I had loaded 20 experimental rounds - same load data but with a Federal 215 Magnum primer. I shot 10 of them and had to come back to 4 inches added to be on target. Theses are much hotter -- how much - I don't know yet. I'm going to chronograph the ten I have left just to see how much hotter they really are.

End results = rifle zeroed at 100yds with my load. 400 yds add 5 inchs to be on target with my load. My load - change the primer - only had to add 4 inches to be on target.
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Re: Shep Magnum Primers Question

Postby Shepard » Sat Sep 21, 2013 10:14 am

I was concerned with how radical of a change there was between Magnum and Standard. Like 20% at 400 yds so I have to investigate the safety of the data and if my accuracy suffers. Two things I have noticed --- #1 is my primers are always pushed out flat -- but no blow outs. #2 is when I use my full sizing die - the only part of the Lapua case that needs sizing is the neck, case body doesn't seem to touch the die. So far my conclusion is I'm right on the edge of what is safe.
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Re: Shep Magnum Primers Question

Postby Marauder 1 » Sat Sep 21, 2013 12:20 pm

So if you backed the load down 10% I'd almost bet you'd be right back in the same ball park. Best part would be using less powder.

I did find some data that shows certain magnum primers are way hotter than others. I'm going to buy that A Squarded Book it's supposed to be the reloaders ruin stone.

Seeya
Mark
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