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Shooting & Reloading - Mausers, Big Bores and others >> Mannlicher Discussion forum & Archive

DarylS
.700 member

Reged: 10/08/05
Posts: 27000
Loc: Beautiful British Columbia, Ca...

Re: 1903 groove diameter
25/07/12 06:35 AM

clatrans - I would take a new, unfired case and neck it up to .308 calibre on an '06 or .308 die, or any other die in that calibre, ie: .300 mag. whatever. You only have to open it up with the expander button, not FL size it.

Then, in your 6.5 dies, size the neck down only until the case will chamber with 'feel' on the bolt, ie: what is called a crush fit. You should see a slight false shoulder on that case before it's chambered, that is, if it has excessive headspace. That is what is meant by making them fit via handloading.

Another way of seeing if it has excessive headspace, is firing an empty case with a live primer in it. The pin will shove the case forward to engage the shoulder, then the primer will back out against the bolt. The amount (thousandths of in inch) it remains backed out, will "roughly" show the headspace.

If the case is properly fitted before fireing it will not stretch lengthwise at the web when it is fireformed. It will simply move the whole shoulder foreward to where it should be. That is, if the chamber has excessive headspace.

Overly large diameter expansion at the web is caused by an oversized chamber, not by excessive pressure nor excessive headspace. You must find out first, what the problem is - oversize chamber at the head, or a bonified headspace problem.

Could it possibly be a 6.5x55?.

--------------------
Daryl

"a gun without hammers is like a Spaniel without ears" King George V

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Subject	Posted by	Posted on
1903 groove diameter	clatrans	21/07/12 06:05 AM
Re: 1903 groove diameter	Kiwi_bloke	21/07/12 10:42 AM
Re: 1903 groove diameter	DarylS	21/07/12 11:04 AM
Re: 1903 groove diameter	MikeRowe	21/07/12 01:05 PM
Re: 1903 groove diameter	Paul	21/07/12 05:45 PM
Re: 1903 groove diameter	DarylS	22/07/12 01:41 AM
Re: 1903 groove diameter	clatrans	24/07/12 05:28 AM
Re: 1903 groove diameter	MikeRowe	25/07/12 03:14 AM
Re: 1903 groove diameter	clatrans	25/07/12 05:22 AM
Re: 1903 groove diameter	DarylS	25/07/12 06:35 AM
Re: 1903 groove diameter	clatrans	25/07/12 07:05 AM
Re: 1903 groove diameter	DarylS	25/07/12 10:56 AM
Re: 1903 groove diameter	Paul	25/07/12 01:48 PM
Re: 1903 groove diameter	DarylS	25/07/12 11:49 PM
Re: 1903 groove diameter	Paul	27/07/12 10:16 PM
Re: 1903 groove diameter	DarylS	27/07/12 11:50 PM
Re: 1903 groove diameter	Paul	28/07/12 01:57 PM
Re: 1903 groove diameter	DarylS	29/07/12 02:08 AM
Re: 1903 groove diameter	Paul	29/07/12 11:24 AM
Re: 1903 groove diameter	clatrans	28/07/12 12:46 AM
Re: 1903 groove diameter	DarylS	28/07/12 09:32 AM
Re: 1903 groove diameter	malco	22/07/12 12:40 AM

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