walther wrote:
My group of ipsc friends had all tried to 231 , we all had same problems , keyholing etc.
This was back in 1989. Maybe they've change the formulation a little bit but we couldn't get a good load without going to a really oversized slugs.
now we were shooting tuned cz75's
they were military grade not commercial market pistols.
maybe that's why. But once we got that a number seven and I have a round wow so easy to shoot an accurate like a laser.
So 1989 ?? Yeah a lot changes in 30 years. But you don't have any idea what you are talking about. How does powder cause key holing? Powder is just to propel the projectile. You get key holing when say a undersized bullet, or say a too soft bullet causes leading and rifling is useless, or a too hard that the rifling doesn't grip, or wrong weight bullet for the rifling. So sounds like the issue was your bullets, NOT the powder. That's like blaming your PCP air, for a pellet not grouping.
Because my group of friends, Most all shoot CZ Platforms from 75/85/Sp01/Shadow 1/2. ALL run Winchester 231 powder, and various types of bullets from 120grn, 124, 125, 135 cast sized to .357, 124, 125 and 147 xmetal, 115, 124, and 147 campros. And I have not once seen a bullet keyhole. With the 1000s of bullets we shot in a night.
I put 5000rds thru my CZ this year with 231, and thousands with other guns, and never key holed 1 round.
Also I brought this up with a older gentleman that used to shoot bulleyes and IPSC in the 80s 90s and when I shot.. He destroyed a 38 super barrel with AA7, it caused throat erosion, it's too hot of a powder. Even the gunsmith agreed.