In a 9mm rifle with a 16" barrel, 147gr factory subsonics aren't subsonic.
Comparing chrono results between a 5" barrel 9mm and a 16" barrel I'm seeing on average an 11% velocity bump. That's obviously enough to push those 147s too fast.
I've started to make some handloads for the 16" and ended up going too low, the gun cycles reliably but who wants a subsonic 9mm going only 850 fps? Gotta bump up that charge and find my 950 fps happy spot.
What I'm really wondering though is, what's a good powder to make use of all that barrel to make bullets go faster? Carrying around 16" of barrel for legal reasons and only getting a lousy 100-150 fps boost over a full sized handgun is lame.
Anyone have a load using a slower powder that works well in their carbine? This ammo would be for 'carbine only' so if it doesn't work right, produces crap velocities or massive fireballs in a handgun it doesn't matter, we just want it fast out of a 16" barrel without being +P+ or 9mm major (which seems to be what some people are doing).
Searching for the info online produces painfully bogus results (so far).
Comparing chrono results between a 5" barrel 9mm and a 16" barrel I'm seeing on average an 11% velocity bump. That's obviously enough to push those 147s too fast.
I've started to make some handloads for the 16" and ended up going too low, the gun cycles reliably but who wants a subsonic 9mm going only 850 fps? Gotta bump up that charge and find my 950 fps happy spot.
What I'm really wondering though is, what's a good powder to make use of all that barrel to make bullets go faster? Carrying around 16" of barrel for legal reasons and only getting a lousy 100-150 fps boost over a full sized handgun is lame.
Anyone have a load using a slower powder that works well in their carbine? This ammo would be for 'carbine only' so if it doesn't work right, produces crap velocities or massive fireballs in a handgun it doesn't matter, we just want it fast out of a 16" barrel without being +P+ or 9mm major (which seems to be what some people are doing).
Searching for the info online produces painfully bogus results (so far).