I tried the 40's but they weren't quiet enough. Still had the crack when using them.
My test bed was an 8" twist. The A-Max wasn't stabilizing at sub-sonic speeds.
You could probably get decent enough accuracy to 100yds if you played with them enough. I did all my testing at the 50. I bought a threaded .308 and a threaded .223 to determine which would be easiest to use with both sub-sonics and regular loads. I found the .223 to be a waste of time and kept the .308.
Travis
