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DWF Supporters
December 21, 2016
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375 SM. after firing, 4 chambers release easily, but two chambers need to have the brass driven (tapped) out. can these chambers be polished with lapping compound? always the same chambers. starline brass. sierra 200gr. any answers, suggestions?
October 17, 2017
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I've found the Flex Hone system sold by Brownells to be a very effective cure for this problem.
DWF Supporters
December 21, 2016
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i'll gives a try. Thanks.
February 21, 2011
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I used some 1/3" wide strips of Kitchen green "ScotchBrite" wrapped round a .30 cal jag & spun with a power screwdriver. It polished nicely while removing almost zero material. 1 dry, followed by one wet to finish.
That one chamber no longer hangs up.
Matthew Quigley on handguns:
“I said I never had much use for one. Never said
I didn't know how to use it.”
DWF Supporters
December 21, 2016
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i made the .375 cartridges from .375 win's. i believe they were the problem. although they
miked .416 at the head after full length sizing, that last 1/16" was snug. the dies were correctly adj. I managed to find .375 brass from Quality Cartridge. they seem to solve the problem. i was given a IHMSA .375 cartridge with the dies when i purchased the gun. these Quality Cartridge brass don't have that problem with that last 1/16" tightness. I think this has solve the problem.
February 29, 2020
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Had same problem with my 375 SM. No matter what cases I used, they all stucked up tightly in chambers. I polished the chambers with honing paste and very fine (1000 mesh) metal polishing paper and now cases come out without difficulty, even with hot/near maximum loads. The biggest problem with the gun is still the fact that I haven´t found a single load which groups as nicely as I would like...Using Norma N200 powder I got two-inch groups at fifty yards (or meters here in Europe...), but velocity was very low, about 1090 fps, and groups opened wildly at 100 yards, being unacceptable. Gotta try VihtaVuori N120 again, I am trying to get about 4 inch groups at 100 yds, but this still waits to happen...I am using Sierra 200 grs Flat point bullet, the only one available here...I´d like to try cast bullets, but they are unavailable here, as well as moulds for 200-250 grs flat point bullets.
DWF Supporters
December 21, 2016
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i was lucky and found some boxes of 220 grain Hornady. every thing i've read say these perform best. Plus, i understand the .375 prefers "hot" loads. i have never pushed loads to Maximum, but they are loaded close to it by my loading manuals. hope you have luck.
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