New cases shoot better than neck sized??????????? - The HuntingPA.com Outdoor Community
 
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post #1 of 8 (permalink) Old 11-07-2010, 07:25 AM Thread Starter
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New cases shoot better than neck sized???????????

Has anyone had a gun like this? The darn gun,a new one to boot,shoots new cases[hand loads] in a tighter group than a neck sized !Any idea why????????

WILLY P
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post #2 of 8 (permalink) Old 11-07-2010, 09:05 AM
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Re: New cases shoot better than neck sized???????????

The case body has expanded to fit the rifle chamber. This results in another pressure level. You need to adjust your load before firing again.

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post #3 of 8 (permalink) Old 11-07-2010, 09:28 AM
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Re: New cases shoot better than neck sized???????????

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Originally Posted by willyp
Has anyone had a gun like this? The darn gun,a new one to boot,shoots new cases[hand loads] in a tighter group than a neck sized !Any idea why????????
I have heard that before. Especially with large magnum calibers.
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post #4 of 8 (permalink) Old 11-07-2010, 10:31 AM
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Re: New cases shoot better than neck sized???????????

When you remove a case from the gun it needs to oriented with a mark.After reloading you must place the round in the chamber with the mark in the same place.This is due to the fact no chamber or barrel is perfectly machined.A black magic marker will work.Machines have limits to thier own accuracy and suffer from wear and tear.Trust me when I tell you the products used in machining are quite valuable.So they use them until they can't anymore.Unless a certain product needs held to millionths of an inch,the machining tool is well used.I know this because my brother is a machinest.He actually jig bores which is a high precision part of machining.Oh and remember your dies were machined.

Bob Seger,till it shines.
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post #5 of 8 (permalink) Old 11-08-2010, 07:14 AM Thread Starter
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Re: New cases shoot better than neck sized???????????

I shall try that,D666,but i wish it weren't so close to deer season!The gun,a Mossberg ATR,will hold a good enough group for hunting?

WILLY P
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post #6 of 8 (permalink) Old 11-14-2010, 07:24 AM
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Re: New cases shoot better than neck sized???????????

My guess is if you see a deer and do your part you will be fine.Deer are big targets.

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post #7 of 8 (permalink) Old 11-14-2010, 10:54 AM
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Re: New cases shoot better than neck sized???????????

My experience with my rifles is, Varmint calibers .243 and under shoot best neck sized, larger calibers shoot best FL sized, I dont know what the reason would be, but this is the case with my guns.
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post #8 of 8 (permalink) Old 11-14-2010, 01:18 PM
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Re: New cases shoot better than neck sized???????????

when a rifle shoots better with fl sized cases rather than neck sized cases indicates a chamber that is not cut concentric with the bore.

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