Hombre0321 said:I believe the purpose of the small primer .308 brass is for Palma Competitions.
EddieHarren said:Jim Carmichael & Fred Huntington used this brass when developing the first version of the 22 CHeetah. They almost instantly had ignition problems when temps fell. They then went to 243 brass for the CHeetah Mk II.
EddieHarren said:Jim Carmichael & Fred Huntington used this brass when developing the first version of the 22 CHeetah. They almost instantly had ignition problems when temps fell. They then went to 243 brass for the CHeetah Mk II.
Laurie said:The answer to that question is ..... it's variable. Depends on both the primer used and how easily the powder is ignited and achieves a clean, consistent burn. When I ran some tests back when the brass was first introduced, Viht N140 was affected at around 3-deg C (38F) but not a larger charge of Viht N150. Rerunning the N140 loads at 10-deg C (50F) on another day, saw groups and ES values shrink and the average MV rise back to what it should have been.
Although ball powders have traditionally been regarded as hard to ignite, a case-full charge of H414 gave excellent results on a day with low single figure Centigrade temperatures.
So, make of that what you will :-\ !! The US Palma teams put Lapua Palma ammo in a fridge overnight and it still performed well within minutes of being removed. I imagine H. VarGet isn't a difficult powder to ignite fully.
EddieHarren said:SDWhirlwind, you are correct! I am an old fart. I wanted one of those CHeetahs as well but at the time was heavily invested in a 12 twist 6x284 with 60 Gr. Sierra HP bullets and a case full of H450. I thought I had died and gone to prairie dog nirvana. Czech CZ Mauser action, Douglas barrel, Chet Brown stock and Unertl 15X Ultra-Varmint.
bsekf said:Please educate me! I thought one of the reasons for the small rifle primer in the Palma 308, 6.5x47L , the BR family and etc. was so they could run more pressure and not blow primer pockets.
Bill