Thread: Velocity gains with longer throat

Originally Posted by 7mmsaum

A Throating reamer is handy when you want to tidy up some throat erosion/ firecracking, and as long as the magazine will hold it, then the extra powder capacity availiable when a projectile is seated out further in the brass can be handy.

The right powder choice with a decent length barrel will help. A factory barrel length may not yield much benefit.

The difference between a short action caliber and a long action one (with same barrel length) can sway a velocity gain in favour of the short action cartridge when long throating.

Perhaps due to a short action cartridge having more rifling length in a std length barrel.

I have long throated a 7 mmsaum, a 7 mm rem mag and a 338 edge.

The saums gain in fps percentage wise beat the rem mag, and the edge beat them both, but it has a 32 inch tube, so roughly 29.5 inches of rifling, and the saum only had 18 inches of rifling and the rem mag 21 inches.

The only way to really know for your combination is to try it !

what gain did you have on the saum??