BD408 is currently working with a 1-11.25 twist I believe in his 338 Sniper Tac. Basically a ballistic twin to my 338 AM. He is reporting fine results with that twist rate.
As far as more velocity potential, don;t think it will make alot of difference. Bore and groove diameter will probably make more difference in ultimate velocity potential then a difference of basically 1" of twist rate. I do not suspect the difference will be enough to really be measurable.
Dan Lilja tells me the velocity potential between a 1-7 and a 1-10 3 groove barrel in 7mm for instance is so small that barrel to barrel variations will impact velocity more then twist rate differences.
I am sure the larger and heavier a bullet is the larger the difference may be but its not much.
Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.
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I do not think a 400 gr 338 bullet is practical. If we jump up to a 375 cal bore then it certainly becomes possible and will be happening here in the future, already in the works.
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Kirby, you are always such a tease! [img]/ubbthreads/images/graemlins/grin.gif[/img] A 400gr. .375 caliber hunting bullet?!?!?!? [img]/ubbthreads/images/graemlins/shocked.gif[/img] Where from?!?
I knew that Bill Shehane is working on similar wildcats to you and Dave AND that one of those is a .375 cal, 350 grain pill launched out of a modified CheyTac to 3100fps.......BUT a 400gr. .375 has my attention!!! I need a QUICK TWIST big bore to mirror my 1-7" 6mm Ackley that Darrell Holland built for me!!! [img]/ubbthreads/images/graemlins/grin.gif[/img]
What and awesome looking rifle… What are you doing about reloading dies? I assume you will have to use a fifty press. Also have you ever run the numbers for the drop in mins at 2000 or 2500 yds? The Ivey rings might be perfect for this project.
It sounds to me like the .408 CT is to the .505 Gibbs as the .338 Lapua is to the .416 Rigby. I'm referring to the beefed up web area, is this so? And what is the head diameter of the .408 CT?
"Fenced yards ain't hole cards and like as not never will be, reason for rhymers and old five and dimers like me."