if going supersonic, why go through the fuss of a specialty round, when the X39 works just fine, even with a cheap model one sales upper?
Thats always been my point.
The 300/221 works better suppressed becasue of less case capacity with heavy bullets and thats an issue, best accuracy is almost always better at 100 percent density.
IE I would not liek to try to find subs with a 308 and deal with all that extra case capacity...
Just my take on the whole thing.
I'd use a 30 carbine but my go to 194 lehigh isn't going to get enough powder in that small case I don't think, to get it close to 1000 fps, much less not stuck in the barrel possibly
Again, the X39 has lots of ammo choices, its not a specialty thing. Cheap plinking ammo, easy to load accurate ammo, kills well with 125 bts, and I'm sure with 110 ish X bullets.
