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February 3, 2020
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Hello all.
I recently came I to a 375 supermag DW revolver. I got 2 boxes of loaded ammo with it, that was supposedly "professionally loaded" by a reputable compan . I'd rather not mention the loader, since I am not 100% sure the loads are his. These loads hit nearly 8 inches low of point of aim. After shooting 2 rounds of the 200 grain loads, I opened the cylinder to look, and seen both had blown the primers out of their pocket . Not pierced primers, when i pulled the rounds from the cylinder, the primers fell out of the cases. Ok no more of them.
So I tried a couple of the 220 gr loads I was give . Less recoil, and hit point of aim at 50 yd . When I went to extract these, after firing 2 rds, they had pretty flattened primers, and were pretty tough to get out.
So to the point of all of this, I talked to the loader who supposedly loaded these shells, and was told that sticky Extraction is very common on the DW supermag, and not an indication of excessive pressure. He did, however, want the 200 gr loads back to pull down and see if they were his loads, as the blown out primers are obviously not right.
So is sticky Extraction really a hallmark of the 375 supermag, or were these shells loaded too hot? Thanks in advance for any help or advice.
April 25, 2008
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I've never had sticky extraction or blown primers on my .375 SuperMag unless they were too hot. Personally, I don't trust any commercial reloads of any caliber SuperMag ammo. Sometimes, when I purchased a DW second hand, it came with the owners loads. I always pulled them down and salvaged the components, if they were ok.
P.S. I've never had any blown primers on any of my revolver loads.
The Savantist
February 3, 2020
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Thank you. That's what I was thinking, but wanted a second opinion from someone with experience with this cartridge. I will start a load workup on my own and see what I get from it. Thanks again for the info.
February 29, 2020
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Hello rgbonej,
I have had similar problems with my 375 DW (as I have written elsewhere on this forum). My 375 SuperMag flattens primers and extraction is sticky even with minimum loads (from many sources) if I try to use H110 or similar powders with Sierra 200 grs bullet. So obviously there are specimens, which do not tolerate fast burning powders for some reason. Today I am going to have some Norma N200 powder and try to use it.
I would say too that sticky extraction is not common with SuperMags. My brother had 357 SM for years, as some of my friends too, and we never had any issues with extraction. I don´t know if it is typical with 375, but the truth is that I haven´t yet discovered a load that would be both accurate and shootable in my 375: either the pressure is over limits or the accuracy is not good. But I still keep on searching a good load...
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Dans Club
February 22, 2009
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I had accuracy problems with my 375SM and after measuring cylinder chambers and the bore I found that some chambers were a bit oversized. I reamed to .377 and use soft (BHN 12) GC- WFN bullets that are sized to .377". The soft bullet fills the bore, groove to groove, and viola! Accuracy issue solved.
FWIW, I never shoot another person's reload unless shooting with them and after they've already shot them in their firearm first. I wouldn't trust a box of reloads otherwise- they all get pulled and recycled. New powder is cheap insurance.
Technically, the glass is always full; half liquid, half air....
August 8, 2016
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rwsem said
FWIW, I never shoot another person's reload unless shooting with them and after they've already shot them in their firearm first. I wouldn't trust a box of reloads otherwise- they all get pulled and recycled. New powder is cheap insurance.
THIS! Always.
April 25, 2008
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Apparently, the .375 SuperMag barrels were oversize for jacketed bullets, so accuracy wasn't all that great in them. Mine is just so-so, unlike my Seville in .375 SuperMag, which has outstanding accuracy.
If I ever get my health back, I had planned to try the Leadhead .375 cast bullet, which is sized .377-.379.
The Savantist
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February 22, 2009
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I've thought about beagling my mould and size a bit larger to see if it will improve. Might have to do that since I like to water quench.
Technically, the glass is always full; half liquid, half air....
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