10mm questions...

[czgunner]

Is it reasonable to expect to hit 1200 fps out of a 4.6" barrel using 20 grain hard cast projectiles?
I have been using several powders and can't seem to hit that speed out of my M&P. The bullet is a Montana bullet gas checked hardcast 200 grain. I've tried .400 and .401. I can get to around 1140 or so before running out of "book" room. I'm at about 4500 feet, if that matters. It's been hot lately too, so cold isn't an issue. Powders have been Longshot, Power Pistol, and AA #9.

 

[bozo699]

Is it reasonable to expect to hit 1200 fps out of a 4.6" barrel using 20 grain hard cast projectiles?
I have been using several powders and can't seem to hit that speed out of my M&P. The bullet is a Montana bullet gas checked hardcast 200 grain. I've tried .400 and .401. I can get to around 1140 or so before running out of "book" room. I'm at about 4500 feet, if that matters. It's been hot lately too, so cold isn't an issue. Powders have been Longshot, Power Pistol, and AA #9.

I’ve shot a M&P but not sure if i chronographed it, I have and do shoot Montana 200 gr hard cast outta my 6” 1911 with AA#9 and hit over 1200 I would have to look up exact numbers
Wayne

 

[czgunner]

I’ve shot a M&P but not sure if i chronographed it, I have and do shoot Montana 200 gr hard cast outta my 6” 1911 with AA#9 and hit over 1200 I would have to look up exact numbers
Wayne

Let me know what your load is.