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June 13, 2010
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. I am the second owner and the total rounds through it is less than 150. Any advise would be appreciated.May 3, 2011
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I have had some blow back issues before. I guess you are getting blow back with sooty cases and powder hitting your face. Some of the causes can be to light of a load, not enough powder, to light of a bullet, and the primer. You may need a faster powder or heavier bullet. Some shoot the SM with the gap at 0.002. Your primer may not be hot enough. Go by the book, but you can alter somethings in a marginal way. I would work the loads up until you notice no blowback and maybe see clean outer shell cases. Just make sure you stay below the max recommended load and remember that if you load for cold weather, those same bullets could shoot hotter with higher pressures next summer.
One question is are you using a pistol rest, if so you could get blow back from the powder blowing back off the rest from the cylinder gap and barrel cone.
You did mention copper fragments. If that is coming from the bullet it sounds like you have a timing issue which can be serious. You need to check your cylinders to see if they align correctly. Even with commercial ammo some will give blow backs on others wont. I think some guns like different loads. Maybe some of the other guys will chime in here.
June 13, 2010
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It was only once that I had the copper or brass specs,my cases are clean but I think you may have hit it with the rest,not thinking, my my cylinder sits directly behind where I rest the gun and if pressure can't go forward it will come back. But why such lousy accuracy. Thanks again I think you might just be right about the rest.
Range Officer
Range Officers
Dans Club
February 9, 2009
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Danny,
I have noticed specifically with my .375SM that depending upon the twist rate of the barrell and the bullett weight you use, the accuracy can vary alot. I have had most luck with the 220 Grain Hornady's but have also loaded some of the Sierra 200 grain bullets. To my knowledge they are the only two commercially available jacketed bullets made to load in this round. I have had marginal success with the 200 grain bullets. I also noticed the best accuracy when approaching max load limits. The rest can be the cause of your blowback in powder. i have burnt holes in more than one sandbag over the years due to forgetting where to keep the gun resting. Hope this helps a little.
SMF
A man cannot have too many SuperMags
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January 24, 2009
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So far I have had great luck with my .375SM with the following load. And so far, have had no reason to mess with it...
Hornady 220GR FP bullet
20G. of IMR 4227
CCI 350 primer
That's in either a cut down .375 Win case, or a .375 IHMSA case, no difference that I can tell thus far. Now, I'm no pro by any means, but my gun has no issues with any of these rounds I feed it. In other words, it has no issues when I pull the "GO" lever, plus the bullets hit hard...they definitely hit hard.
I love this gun.
June 13, 2010
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I did try 21gr. imr4227 yesterday but I was useing cci200,I have a few bullets left that I can try again along with a different rest position.I'm thinking the back pressure would effect accuracy is this correct. I wish the 220gr weren't so costly $40/100 locally when I can find them, cause I would like to be able to shoot alot more.Thanks
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Range Officers
Dans Club
February 9, 2009
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Yes, those 220 Hornady's do command a price tag. I paid around $39.00 the last time I bought them here locally. They are actually one of the items I seek out at gun shows and to some degree of success.
A man cannot have too many SuperMags
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Dans Club
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November 17, 2008
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The guys have you covered so Ill just say 
.
LB
Wisdom is merely the realization of how little one knows, therefore I am wise.
June 13, 2010
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Thanks for the welcome and I knew I could get answers here. Also what is the shortest I can trim brass,at 1.600 I am on the edge or run out of canelure to crimp.
May 3, 2011
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Here's Waderman shooting a SM. You can't see these fireballs in the daylight, but this gives you an idea of what your pistol is doing when you shoot it. No wonder we get that blow back sometimes. Waderman records his shooting and takes a still pic from his videos. It's like a camera flash it happens so fast. If we could see these fireballs every time, we probably wouldn't shoot these SM. 
June 13, 2010
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I'll have to try that,dang good picture. Looks like lots of horse power there.
June 13, 2010
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I'll have to try that,dang good picture. Looks like lots of horse power there.
Range Officer
Range Officers
Dans Club
March 27, 2009
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Video is the only way! I have tried just to catch the flash on 357mag with still shooting so went with vid and only got one. Good info here even for those of us that dont't have our 375 yet!!! when you wanna part with it keep us in mind!! And Welcome to this place. What other Dan's do you have Danny? pics please!
June 13, 2010
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This is my first,I got it in trade for a ruger 6" 22 markll from a dealer here,apparently he didn't think ya could get dies for it,which I got from CH4D and when I told him I got a set he just had this I just got screwed look on his face. I also came with a aimpoint 2000.50 piecs of 375sm brass,ammo box and a shoulder holster which doesn't fit to good due to the aimpoint. It is hard to believe that all this hassle with the blowback was caused by the rest,I have no clue why that didn't dawn on me. I'm thankful that the folks here got me back on track. My brother does casting so I might get the mould to try useing in this fun to shoot DW. I will have to try and get a picture up.
June 13, 2010
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Here it is,not the best but covers most of it. It is in my mind that sooner or later I'll be passing this along and get started on something else,hate to this thing is alot of fun to shoot but just cost more for the amount I like to shoot.
May 3, 2011
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I thought about shooting the 445 with black powder I wonder how that would turn out. Some shoot the .45 Colt with black powder. It would probably turn out like this with some serious blow back.
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January 24, 2009
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Gary, you may be right.
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