Thread: Powder for 303 150's

Originally Posted by Three O'Three

Thanks Mickey Duck. I do know about only neck sizing 303 which I do and loose chambers and head space In 303's, mines at quite excessive but had it checked and still safe to shoot. I know about the o'ring trick just never tried it, probably a good idea to do so next time I go out shooting. As for low pressure signs I'm seeing pushed out primers and excessive soot around the necks. With some 748 loads I've been getting a both push out primers and sticky bolt on extraction, over pressure? 180g jacketed boolits without hurting the wallet are hard to find. I have bought and used Roberts 210g's with good results, 28gn of 2208 and 10gn of trailboss with a WLR primer give me .75 to 1" groups at 50m. Weird thing is I get no pushed out primers with 28gn of 2208 but between 28-32gn primers are pushed out, more than 10gn of trailboss pushes out primers aswell?

Photos.

I dont understand what you are meaning buy pushing out primers? This can basicly only happen from excessive headspace.