243, why reinvent the wheel...

been around 60 plus years... brass ain't an issue...

if its a new toy, then why not the Creedmoor... gives ya something to play with...

a 1 in 7 twist on a Mauser Length or Long Action, where one can seat a bullet out there, can upgrade performance that is worthwhile, and noticeable... AI it for a little more of a good thing.