Driftwood Johnson
Member
With regards to cast bullets, I assume you slugged the bore. I once had a NO.4 with a .315" groove dia. Accuracy was hopeless as my largest bullet was .314". Then I tried shotshell buffer which made a HUGE difference. I've no idea why, but it definitely worked.
35 Whelen:
Yeah, but I don't still have the one that keyholed so badly, so I don't remember what it slugged at.
As I said earlier, the Savage gun has just two skinny little grooves. They are very deep, I seem to recall the slug came out with two tiny fins on it that were .317 in diameter. The biggest bullets I have are .314 in diameter. I really don't think a larger bullet would make any difference, other than perhaps raising pressure too much. Since the grooves are so thin, I think the bullet is simply stripping as it goes down the bore, the two grooves are too narrow to get a good hold on the lead, although they get a good bite on the harder copper jacket of a jacketed bullet.
I slugged the Australian gun that shoots so well with anything, but off the top of my head I don't remember what size it slugged to. But I was using the same .314 bullets.
Now I have a question for you.
What in the dickens is shotshell buffer? I have never heard of that.