Thread: rifling twist what are the effects?

Fast twist can have some dramatic effects - seen that with a fast twist 223 barrel fitted to a 22-250 and projectiles vapourising part way to the target.

Also fast twist will cause higher pressures and may be not able to reach desired fps b4 over pressure becomes an issue. Been watching a mate trying to get 7mm 183 gr SMKs with long bearing surfaces perform in a fast twist 284W. Ran into pressure problems b4 reaching a desired velocity. Firing 180 gr Scenars and no problem with getting fps and accuracy with acceptable pressure. Firing the same SMKs in a SAUM no problem. Fitted a 1:9 barrel to the 284W and now reaching good velocity (in the node) with the SMKs with no pressure issues. Improved velocity has optimised the BC.

A balancing act of trade offs.