I have three 45's. I have a 1-18 twist .458 Green Mountain barrel on a renegade, a 1-30 twist .451 Green Mountain barrel that has never been shot, and a Green Mountain 1-30 twist .451 that is on a Hawken that I love.
I have shot some great groups with the 1-18 but I think it really wants a bigger bullet.
The Hawken is shooting a paper patched 409 gr RCBS 11mm rifle bullet. This bullet shoots so well in the 1-30 that I just haven't shot the others much. I would like to shoot some 500 gr or bigger in the 1-18 with a real smooth sided paper patched bullet. I just haven't done it yet.