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SR1911 barrel leading

This is a discussion on SR1911 barrel leading within the Reloading forums, part of the Firearm Forum category; After about 500 rounds of factory FMJ 230 GR rounds through my SR1911, I shot 50 rounds of my reloads and experienced quite a bit ...


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Old March 23rd, 2013, 11:49 AM   #1
 
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SR1911 barrel leading

After about 500 rounds of factory FMJ 230 GR rounds through my SR1911, I shot 50 rounds of my reloads and experienced quite a bit of leading in the first 1/2" to 5/8" of the barrel. My loads were 230 GR RNL consisting of 92% lead, 6% antimony, and 2% tin with a BHN 0f 18 in front of 4.6 Gr of W231 using CCI 300 primers. Bullet Dia. seems to be a consistent .452 Dia. Bullet lube is commercial wax base. Velocity should be around 750-775 FPS and pressure around 19000 PSI. I realize this could be a "Can of Worms" since there so many variables but I'm wondering If anyone else has experienced this and found a solution. Thanks-



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Old March 23rd, 2013, 12:32 PM   #2
 
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These two metals stick to each other. Just like liquors, don't mix your lights and darks.

Clean before changing bullet types and it will greatly reduce fouling with either.

Kroil brand oil works great at penetrating and lifting the lead out. Run a well soaked patch through the barrel and let it sit a bit.
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Old March 23rd, 2013, 12:59 PM   #3
 
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With a CUP of 19000 wouldn't a BHN of around 15 be optimal?
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Old March 23rd, 2013, 04:36 PM   #4
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I question your estimate of 750-775 FPS with 4.6gn of 231. I also use 231 and shoot lead 230gn w/5.1gn over Win primers and measure the speed as 775 to 780fps with my chrono. During tests as I was first developing the load for my SR I recorded 680fps with 4.6gn.

I'm using S-n-S bullets and can't address the lead mix for a good comparison. Like you said, there's a lot of variables. YMMV
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Old March 23rd, 2013, 06:49 PM   #5
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nickoftime, You have two options .... use a very soft bullet, or increase your powder charge and use a softer bullet. 45 ACPs were designed to operate at 21k psi @ 850 fps with a 230gr LRN bullet. 5.1 gr of W-231 is the minimum charge weight in the Speer #14 manual for a 230 gr LRN .... 5.6gr is the max in the Speer #14 manual because they use a BHN 10 bullet. The minimum load develops about 14,500 psi @ 760 fps whereas the max charge develops only 18k psi chamber pressure @ 831 fps.

With a 230 gr LRN BHN 14 bullet, chamber pressure would be 20k psi with a W-231 load of 6.0 gr and would produce about 860 fps.

The optimum bullet hardness for the 5.6 gr load would be BHN 12~13. The formula is BHN=chamber pressure divided by 1400. BHN 18 is way too hard to obturate. It would take a chamber pressure of more than 25k psi ... which is well over the max for a 45 ACP.

I think you will find a softer bullet loaded a bit hotter will fix you lead fouling problems, will be very accurate, yet well under max chamber pressure. Like stargeezer, I have chronographed these loads and I don't see any way your 230 gr bullet will achieve 750 fps with a W-231 charge weight of 4.6 gr.

Last edited by Iowegan; March 23rd, 2013 at 06:54 PM.
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Old March 24th, 2013, 09:18 PM   #6
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Quote:
Originally Posted by nickoftime View Post
After about 500 rounds of factory FMJ 230 GR rounds through my SR1911, I shot 50 rounds of my reloads and experienced quite a bit of leading in the first 1/2" to 5/8" of the barrel. My loads were 230 GR RNL consisting of 92% lead, 6% antimony, and 2% tin with a BHN 0f 18 in front of 4.6 Gr of W231 using CCI 300 primers. Bullet Dia. seems to be a consistent .452 Dia. Bullet lube is commercial wax base. Velocity should be around 750-775 FPS and pressure around 19000 PSI. I realize this could be a "Can of Worms" since there so many variables but I'm wondering If anyone else has experienced this and found a solution. Thanks-
I was having the same problem with W231 in my SR1911. I'm shooting 230g Mastercast (PA) LRN and started out with 5.1g and had a big leading issue. I gradually backed it down to 4.2g and that seemed to eliminate most of my barrel leading problem (still a little chamber leading though). I just tried 4.8g IMR 700X with the same bullet and that worked fine so I think I'll stick with it for the time being.
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Old March 25th, 2013, 03:22 AM   #7
 
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Anyone shooting lead bullets should not be without this:

LEWIS LEAD REMOVER | Brownells

It works great. There's a video on the above page that shows you how to use it.
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Old March 25th, 2013, 05:43 AM   #8
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StandingTall, Lead removers are totally unnecessary if you match chamber pressure to bullet hardness. See: http://rugerforum.net/library/19869-...revolvers.html The techniques for revolvers also works for pistols.
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Old March 25th, 2013, 09:06 AM   #9
 
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Quote:
Originally Posted by Iowegan View Post
StandingTall, Lead removers are totally unnecessary if you match chamber pressure to bullet hardness. See: http://rugerforum.net/library/19869-...revolvers.html The techniques for revolvers also works for pistols.
That's some good info. Thanks.
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Old March 25th, 2013, 12:02 PM   #10
 
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Sometimes I can get an answer in before Iowegan, but not today! I would say try a softer bullet, 18 isn't necessary for 45 ACP (a whole lot of folks think "hard cast" means harder is better, but it's not necessarily so). Leading in the beginning of the barrel is often from undersize/too hard bullets not sealing the bore...
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