Re: .408 Twist rate and barrel length recommendations
The folks at chey tac are using a 1-13 twist for the 408. However, for their 375 CT they are using a 1-11.5 twist.
Im currently building a 375 snipe tac (408-375 improved). I've really struggeled with the right twist rate vs bullet combo. I have two barrels in the works, a 1-10.5 twist and the other is on hold waiting the results of some testing of new bullets.
You may decide to neck your 408 to 375 or even take it one step further and neck it to 338. Either way, like me, you will probably drive yourself crazy trying to find the best caliber. And then after that, finding the right twist and bullet can even be more fun.
The 375 was not real popular in the past, but the arrival of new bullets for this caliber is really creating great interest. There are alot of guys on this site and Longrangehunting.com that can help you in your qwest.
Some are bullet makers, some are shooters like me and others are gunsmiths, barrel makers etc. All of them can help you. Take some time to read old posts and it will educate you tons.
take care,
kz