.220 Swift load work up
I wanted a new powder for the Swift, the current manuals ignore, the new powders, so with a bit of research I picked IMR 8208 XBR, I've had very good results in the .223/5.56, they use it in the 22-250 and the .243 , max load in the 22-250 was 35.8 I started at 35.5 and went up half grain at a time. Measured case head with a mike. the photos show the results. OACL 3.445 was a bit long do to the rifle being a single shot Cooper MD 22 Case head size. was as follows.
Un-fired .445 avenge
36. grs 447.1
37. grs 447.4
Interesting the top load the head size was smaller