Mark Bansner is making me one of his ultimate ovis rifles. I was originally intending to have it chambered in 7mm wsm. I spoke with a cousin recently who suggested I go with a 6.5mm wsm due to the ballistic superiority of the 6.5mm bullet for long range shooting. I reload so having a wildcat cartridge isn't a problem. I'm thinking about loading with Swift scirocco 2 bullets. Swift makes a 6.5mm 130gr scirocco with a SD of .266 and a BC of .571. Swift makes a 7mm 150gr scirocco with a SD of .266 and a BC of .515. I'm not like all the other studs on here shooting goats and sheep at 800 yards or more . I'd like to keep my shooting to 400 yards or less, so this doesn't have to be a 1000 yard gun. What are your thoughts about the practical differences between the 6.5mm wsm vs. the 7mm wsm for distances out to 500yards?
PS. I'm waiting to hear back from Swift. When I do I'll post expected velocities for the two bullets out of their respective cartridges.