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Deleted member 46119
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R-33 isn't going to give the best velocity when it's that overbore. R-50, 869, WC872, etc are going to be your friends. But like I said....around 3600fps is a safe max. Sure there are fast barrels that get 150fps more on occasion but it's not the norm.
Yup.
If you want to go fast, IMO go up in diameter.
It might help to understand why you want a 6mm 105grain projectile to go 3800fps