Burn/tarnish marks on 45 ACP fired brass

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Burn/tarnish marks on 45 ACP fired brass

Post by imflyer on 9/24/2018, 9:18 pm

I am a newbi to reloading (just 2 years).  Have noticed that my reloaded 45 ACP brass have burn/tarnish marks approx. 1/3 around and down from the case mouth. I use a single stage press, with Lee carbide die set and load 180gr LSWC(flat base) .453 dia (slugged bbl to get proper dia for bullet), CBC and Starline 1-3 time fired cases,  3.5 gr of bullseye, 1.25 AOL, .469 taper crimp.  I use a Lyman "M" die with a very slight bell for flairing. I am very carefull in placing the bullet straight on the case before seating the bullet, then taper crimp (seperate stage). This load functions perfectly in my SA RO Elite w/ 10#recoil spring and 18# hammer spring. Never had a malfunction from day 1 using this process.  Need input from experienced reloaders as to why this is happening?

imflyer

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Re: Burn/tarnish marks on 45 ACP fired brass

Post by Jon Eulette on 9/24/2018, 9:26 pm

Lighter charges don’t seal as well as a warmer load. I would tighten the crimp down to 0.465-0.467 because it will help with the burn, but you will still get the burn marks.
Jon
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Jon Eulette

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Re: Burn/tarnish marks on 45 ACP fired brass

Post by imflyer on 9/24/2018, 9:31 pm

Thanks Jon..I will try that on my next reload session.

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Re: Burn/tarnish marks on 45 ACP fired brass

Post by zanemoseley on 9/24/2018, 9:50 pm

I recently went from .469" crimp to .463" crimp and am pleased with the results so far. I feel I get more consistent ignition and am able to slightly lower my charges due to higher pressure per grain of powder.

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Re: Burn/tarnish marks on 45 ACP fired brass

Post by BE Mike on 9/25/2018, 9:10 am

If you are getting good groups at 50 yards, fogetaboutit!
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Re: Burn/tarnish marks on 45 ACP fired brass

Post by zanemoseley on 9/25/2018, 9:33 am

BE Mike wrote:If you are getting good groups at 50 yards, fogetaboutit!

And good reliability/consistency.

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Re: Burn/tarnish marks on 45 ACP fired brass

Post by lablover on 9/25/2018, 7:05 pm

I did the same and went to .463 crimp..better burn and better accuracy.  For me anyway

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Re: Burn/tarnish marks on 45 ACP fired brass

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