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I would have to confirm via my notes, but I'm getting somewhere between 2550 and 2700 with Barnes TSX 350gr bullets in the 458 Winchester
You should be able to get much more speed than 2300 with a 325 - that's if you have a proper 458 Winchester throat.
Or not.
It's a Blaser, not a Win Mag. Original factory load was 350g at 2000 for driven boar with the same recoil as a 9,3x62. 400g at 2100 could be considered hot rodding but it works
http://www.cartridgecollector.net/45-blaser-115-x-55
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