450Bushmaster.net

Hoot wrote:

Rklenke wrote:Luckily, I've had good luck with the HAP bullets... So far. I've got lots more to shoot. I'm using LilGun and Shooters World heavy pistol (AA9) as my test powders. Here's a AA9 group at 100.
...snip...

Maybe I'll make my make my own thread instead of hijacking yours...

Nonsense! Threads are made for hijacking. Look around. We do enjoy more Range Reports however.

Hoot

Yep. Love those range reports. Make your own if possible though. It makes things easier to research.

Hoot-
With my ongoing galloping senility, it has taken me a bit longer to get my mental ducks arranged properly regarding your question.

An easy check of temperatures at your problematic case mouths is likely possible with a temperature indicating lacquer, such as Tempilaq:Tempilaq web site.

Placing two or three dabs that have different temperature levels around the periphery of the case mouth might provide clues about what's happening. I'd try it myself, but my three 450B rifles are all bolt actions, and case heat is readily transferred to the chamber area of the barrel.

--Bob