Trimming 40/65 starline brass

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csshooter
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Joined: Thu Mar 17, 2016 9:47 am

Trimming 40/65 starline brass

Post by csshooter »

After fire forming I'm finding cartridge length less than 2.1. If I trim them all to the shortest 2.087 will l be creating any problems ?
jackrabbit
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Re: Trimming 40/65 starline brass

Post by jackrabbit »

I don't think so, but others here may disagree. I have done some excellent shooting with brass as short as 2.08.
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desert deuce
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Re: Trimming 40/65 starline brass

Post by desert deuce »

It depends on how you prepare your brass before loading and what you are loading for.

Most fireformed brass gets longer when full length sized.

It is possible using a brass stretching technique to stretch brass 20 thousandths or so, no problem.

I have gotten new in the box Remington Factory Brass that is 1.80" , I fireform it with cornmeal, anneal slightly, stretch it and by the way I do not size brass, I just shoot it again with cornmeal to fire form it, trim to length and load.

My experience says it is better to have brass a tad short rather than a tad long.
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BFD
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Re: Trimming 40/65 starline brass

Post by BFD »

csshooter wrote:After fire forming I'm finding cartridge length less than 2.1. If I trim them all to the shortest 2.087 will l be creating any problems ?

Yes. Why would you trim them more if they are already shorter than 2.1?
Kurt
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Re: Trimming 40/65 starline brass

Post by Kurt »

csshooter wrote:After fire forming I'm finding cartridge length less than 2.1. If I trim them all to the shortest 2.087 will l be creating any problems ?
If you have one of the newer Shiloh 7°chamber end transitions then the normal 45° or the flatter of the originals then it does not make much difference if the cases are a little shorter.
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gunlaker
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Re: Trimming 40/65 starline brass

Post by gunlaker »

I have the standard Shiloh .40-65 chamber and use brass that is a couple of thousandths longer than 2.1" after fireforming, as I get very tiny lead rings on the case mouths if I run it any shorter.

Chris.
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Lumpy Grits
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Re: Trimming 40/65 starline brass

Post by Lumpy Grits »

OP-Do you do any case sizing?
Check OAL, after you size.
Chamfer the inside of the case mouth. :wink:
Gary
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csshooter
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Re: Trimming 40/65 starline brass

Post by csshooter »

Thanks for your feedback.
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