MoscowMike
Member
I have ordered a suppressor for my FM (Argentine) Hi Power. In prep I bought a threaded barrel from Brownells and have started working up 9mm sub sonic loads. The pistol is scarcely used, and has worked fine with various 115, 124 and 147 gr loads.
The Brownells barrel dropped right in and worked reasonably well with 115 gr factory loads. With heavier bullets I have had problems. 124 gr RMR TCFN and 4.4 gr HP-38 or 147 gr RMR TCFN 3.6 gr HP-38 seem to not move the slide back enough to reliably pick up the next round so I have stovepipes, FTE and FTF problems.
Brownells suggested the barrel needed breaking in, and it had a fairly rough finish. I polished the chamber, used a buffing wheel and Dremel rubber polishing tips to slick everything up as well as thoroughly oiled contact points.
Seems to feed the 115 gr a bit more smoothly, but has the same problems with 124 or 147 grain. The bullets feed fine, but don’t eject reliably. Those are close to maximum loads with HP-38 according to some sources.
I have a spare Hi Power spring. It seems to be a bit stiffer than the factory spring that came with the Hi Power. Seems to me my next step is to start trimming it down a bit at a time.
Any other ideas?
The Brownells barrel dropped right in and worked reasonably well with 115 gr factory loads. With heavier bullets I have had problems. 124 gr RMR TCFN and 4.4 gr HP-38 or 147 gr RMR TCFN 3.6 gr HP-38 seem to not move the slide back enough to reliably pick up the next round so I have stovepipes, FTE and FTF problems.
Brownells suggested the barrel needed breaking in, and it had a fairly rough finish. I polished the chamber, used a buffing wheel and Dremel rubber polishing tips to slick everything up as well as thoroughly oiled contact points.
Seems to feed the 115 gr a bit more smoothly, but has the same problems with 124 or 147 grain. The bullets feed fine, but don’t eject reliably. Those are close to maximum loads with HP-38 according to some sources.
I have a spare Hi Power spring. It seems to be a bit stiffer than the factory spring that came with the Hi Power. Seems to me my next step is to start trimming it down a bit at a time.
Any other ideas?