Originally Posted by mathman
This site has many references to deer killed with fast twist 22-250 rifles, Improved and regular. How different is a Creedmoor going to be?


CM : Minimal taper .462” diameter at 30 degree shoulder ,
AI : A tad more taper, .454” +/- at 40 degree shoulder ,
.22-250 Standard Lots of taper .414” with 28 degree shoulder angle

All similar, but subtly different shapes.

Will the 22 CM clean up a 22-250 Rem Standard chamber ?

Will that CM chamber fire form Standard brass to CM ?
Or does it need a step in the neck for forming ?

History May Not Repeat, But it Rhymes.