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Shooting & Reloading - Mausers, Big Bores and others >> Rifles

DarylS
.700 member

Reged: 10/08/05
Posts: 26516
Loc: Beautiful British Columbia, Ca...

Re: My 35.303 is Finally Finished
16/02/11 01:40 AM

.384 neck diameter is good - only .004" expansion over unfired (I assume loaded)

.454" unfired vs. .499" fired - yes- tight chambering to squeeze the case down.

A .401" shoulder is normal.

A .455" to .457" base at the rim in a fired case would be quite normal. That is why once fired .303 brass usually makes good .458 cal. bullet jackets. John Buhmiller used to call them his mouse-hole makers.

Necking to .40 cal. removes the shoulder completely to a straight case.

Necking to .375, then back down in your die to form a brand new ie: false shoulder is what I suggested. Even if they necked out straight, this is what to do. Your sizer will remove any 'bulge' - do not worry about that. No - the brass will not thicken.

Creating false shoulders for proper case fit removes or reduces problems, it does not create them - as long as your FL die is properly made, it will reduce the case to slightly smaller than our fired size. That is normal.

As long as the tight base doesn't give you any problems, I wouldn't worry about it - that-is, as long as you can chamber them OK - otherwise, I'd have that rectified.

I am in no way attemting to start anything. I was only making suggestions to help with brass life. If you wish not to follow, that's fine - it is something I do automatically with every new rifle - check chambers and make the brass fit prior to shooting them.

SAAMI and CIP standards were VERY slack. They allow way too much latitude in case and reamer sizing - just went through this on a Swedish gun forum - with 9.3x62 specs and standard rifles.

Those who let the belt and rim or FL die look after their headspace, have poor case life. This is normal, but doesn't have to be.

Edited to include FL die in the last sentence. THAT is where 99% of heaspace slop in rimless and belted cases comes from.

Edited by Daryl_S (16/02/11 02:10 AM)

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Subject	Posted by	Posted on
My 35.303 is Finally Finished	Perry	31/01/11 11:23 PM
Re: My 35.303 is Finally Finished	mehulkamdar	05/02/11 03:23 AM
Re: My 35.303 is Finally Finished	Perry	14/02/11 07:11 AM
Re: My 35.303 is Finally Finished	Rule303	14/02/11 12:25 PM
Re: My 35.303 is Finally Finished	Perry	14/02/11 08:11 PM
Re: My 35.303 is Finally Finished	ovny	14/02/11 08:26 PM
Re: My 35.303 is Finally Finished	DarylS	15/02/11 03:16 AM
Re: My 35.303 is Finally Finished	mauserand9mm	15/02/11 08:57 AM
Re: My 35.303 is Finally Finished	DarylS	15/02/11 09:45 AM
Re: My 35.303 is Finally Finished	mauserand9mm	15/02/11 02:39 PM
Re: My 35.303 is Finally Finished	450_Ackley	15/02/11 05:25 PM
Re: My 35.303 is Finally Finished	Perry	15/02/11 10:17 PM
Re: My 35.303 is Finally Finished	DarylS	16/02/11 01:40 AM
Re: My 35.303 is Finally Finished	mauserand9mm	16/02/11 09:01 AM
Re: My 35.303 is Finally Finished	450_Ackley	16/02/11 03:51 PM
Re: My 35.303 is Finally Finished	mauserand9mm	16/02/11 05:11 PM
Re: My 35.303 is Finally Finished	DarylS	17/02/11 03:50 AM
Re: My 35.303 is Finally Finished	Rule303	20/02/11 07:35 PM
Re: My 35.303 is Finally Finished	mauserand9mm	17/02/11 08:44 AM
Re: My 35.303 is Finally Finished	NitroX	31/01/11 11:51 PM
Re: My 35.303 is Finally Finished	rigbymauser	01/02/11 04:03 AM
Re: My 35.303 is Finally Finished	Perry	01/02/11 06:49 AM
Re: My 35.303 is Finally Finished	Ben	01/02/11 07:04 AM
Re: My 35.303 is Finally Finished	458Shooter	02/02/11 07:22 AM
Re: My 35.303 is Finally Finished	Rule303	02/02/11 10:33 AM
Re: My 35.303 is Finally Finished	NitroX	02/02/11 03:20 PM
Re: My 35.303 is Finally Finished	DarylS	03/02/11 08:49 AM

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