Well that’s interesting.
So with the Blazer 115 FMJ, the little 3.68” barrel Shield got 80% of the velocity the 16” barrel made. I’m going to interpret that as the 30 Super Carry is all about high chamber pressure but doesn’t have the case capacity or expansion ratio to keep the high acceleration past the first 4 inches or so. In other words the last 12” of acceleration only netted 200 fps but the first 3.68” netted 1030 fps. That makes me think the little Shield EZ might be a better host for 30 Super Carry than I thought.
The low muzzle report from your carbine also means low muzzle pressure.
But, that’s not a bad thing for carbine. Yep I’ll bet you have fun with it.
Thanks for posting.