Home Forums Hunting & Shooting Hunter's Campfire Reloading... Reading pressure signs

I have been banned from more gun forums for posting my overload work up... than I have blown up guns.

~15 years ago there was a guy on Accurate Reloading forum that could calculate von mises stress in brass case heads.
https://en.wikipedia.org/wiki/Von_Mises_yield_criterion
His name was "a$$ clown".

When I overload a 308 case until extractor groove growth [mauser case head] Quickload would say ~72 kpsi
That agreed with his prediction, as did 223 at a higher pressure.

Man ass clown I haven’t heard that handle in a long time. He was the one that loved the 50 Beowulf??

He was resented by many.. I never understood the rivalry.. too smart, african big game, drinking.. or what.

Some people are azzhole magnets. Every azzhole on the forum finds me eventually.

Lately, there's a whole new crop of azzholes on here. They're getting younger. Those "living in mom's basement" azzholes have started turning up here lately.

This is like the thread where a guy posted pictures of another mans buck and claims it as his.. Only more obvious. Kind of like the idiots that start at the max book loads and work up from there to "find pressure and rock on". Those guys are known for starting there and then adjusting seating depth to find accuracy too. Carry on though, is all I can say..

Wouldn't be surprised if the bullet from that .308 round didn't hit dead center - inherent accuracy, you know.

OK lads, see below:
L-R
Nosler 180gr AB factory load
Winchester 180 ST factory load (70s vintage)
180gr TTSX WW cases (virgin) 71gr RL-22 CCI 250 primers (max load in Barnes book)
180gr TTSX RP cases (3X loaded) same load as above.



Rifle is a pre-war 70 300 H&H. My hand loads and the Nosler load shoot .75 MOA, the factory Silvertips about 1.25"

OK, first check out the primers and second, can you guess which load resulted in a hard bolt lift? All velocities under 3000fps, with the TTSXs right at 299o or so.

When a rifle cartridge goes off, the primer is pushed backward, due to powder gas pushing through the flash-hole, so it would seem to make sense that a really flat primer indicates high pressure. Not necessarily. A really flat primer can also be caused by slightly excessive headspace.

When the firing pin hits the primer, it drives the case forward. If there’s a little slop between case and chamber, the expanding powder gas first pushes the primer backward in the primer pocket. If the pressure is low enough, as with the .30-30 Winchester, the primers will remain slightly backed out of the fired brass. This is common in ancient and well-worn .30-30 lever actions.
If the pressure is higher, however, as with the .30-06, the rear of the primer itself expands a little as it backs out, since it’s no longer supported by the primer pocket. In another micro-second the case itself is thrust back over the slightly expanded primer.

At the same time, the case stretches a little bit, so the handloader also finds a shiny ring a half-inch in front of the case head. Our innocent handloader now sees what he thinks are two signs of high pressure, when in reality the only problem is oversizing the case.

https://www.handloadermagazine.com/mistakes-and-misconceptions

.

I believe that was primarily about false negatives, i.e., when there are "no pressure signs" but there actually was high pressure.

Some people are azzhole magnets. Every azzhole on the forum finds me eventually.

Lately, there's a whole new crop of azzholes on here. They're getting younger. Those "living in mom's basement" azzholes have started turning up here lately.

I do not recall the bump back in thousands. but I am going to try with a Lee Collect (neck only) and see what happens.