7MM 08 40' Improved

[Catfish]

I am a wildcat nut and have several of them, but what Rocky said about your increase in velocity is absolute correct. Another thing to consider is that wildcat rifle bring far less than one chambered in factory round if you sell it. If you plan on shooting out the barrel yourself that makes no difference though. In any event your gain in velocity with that round will be very small on paper and unnoticable in the field.