Mr_Flintstone
Member
The other day I was reading about bullet options for 6.5 Carcano rifles. One of the articles mentioned using standard .264" bullets instead of bore filling .267-.268" bullets to reduce the pressure in older rifles. I can see where you would have gas leakage around .264 bullets, especially boat tail bullets that don't obturate, but how much pressure would be lost in this way? Is there a way to calculate the size of the gap through which the gas would leak and/or a way to enter that into Quickload or GRT?