30 BR cast bullet optimum freebore

[Spook]

Looking to begin shooting in local cast matches and my 30 BR is shooting patterns as opposed to groups.
My thought is , it being a 15 twist, to use "light for caliber" bullets.
Does anyone have an ideal freebore dimension before I chuck it up and have at it?
I appreciate any help.

 

[JSH]

You might have some more in put at the cast bullet association site. A lot of knowledge there.

 

[charlie b]

Yep, I'd look over at that forum as well. I shot a lot of .308 cast, but, a 1-10 twist so I was usually shooting heavier bullets slower.

If you want a shorter bullet I'd look at the RCBS 165SIL or the NOE 310-165-FN H3 (XCB). They should work with a 15 twist. There are some others that might also work. Look at the Cast Bullet Assn website for past match results. A lot of folks run the .30BR and show their equipment and loads.

Before I had to stop casting a .30BR was my next pick for a barrel.