Re: Idaho legal 338 Allen Mag testing
Corn meal method is simple and very old way of doing it. Depending on the size of your case your forming, 300mag sized cases use around 20grns of a fast burning powder, larger cases just increase the amount, the 408 sized cases use up to 50grns. I use Unique in the reg sized cases and the large ones i use 4198, just because i have some old powder laying around. Prep the cases and prime them, put in the powder, on top of the powder fill the case full with corn meal. Make a small wad of tissue paper and press it into the neck to hold all the contents. Fire the case in your rifle with the muzzel brake REMOVED. I say clean out the residue in the bbl after 5 rounds, the burnt cornmeal tends to get everywhere. Use a bore guide when cleaning to keep the stuff out of your trigger. The shots are loud so were hearing protectors. No recoil. Saves on barrel life and is easier on the brass if your doing a major form. The Snipe-tac and 338AM are major forms, the brass is heavy. They will only form about 90-95% However they will shoot the same as fired cases. P.O. Ackley used this method with most of his wildcats.