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Long bullets seated deep into short mag brass, effect on accuracy????

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Unread 10-30-2011, 12:02 PM
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Re: Long bullets seated deep into short mag brass, effect on accuracy????

I doubt most folks will tell the difference between either the WSM or SAUM versions of 7mm cartridges as to their accurate barrel life. There's only about 5% difference in charge weights in the mid to low 60's for charge weight for a given powder and bullet muzzle velocity. For all practical purposes, both have the same amount of hot burning gasses cutting away at any given point in the throat for the same amount of time.

Barrel life's round count differs depending on how accurate the barrel was when new to when its owner/shooter notices a loss of accuracy. New barrels that shoot sub 1/4 MOA at 100 yards seem to have half the life as one starting out in the 1/2 to 3/4 MOA level at 100 yards. And then there's conventional service and factory rifles starting out new in the 2 MOA range that go10,000 rounds of seemingly accurate life.

When one adds in how accurate the owner/shooter shoots them, then a whole new set of numbers show up. Someone shooting squirrels with their Grandpa's .22 rimfire made in the 1930's doesn't mind the fact that a couple hundred thousand rounds have gone down its barrel. But his good friend on the US Olympic Team rebarrels his two year old gold medal winning rifle every 20 to 30 thousand rounds.

Last edited by Bart B; 10-30-2011 at 12:07 PM.
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Unread 10-30-2011, 02:23 PM
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Join Date: Jun 2010
Location: greenwood, IN
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Re: Long bullets seated deep into short mag brass, effect on accuracy????

I'm not going to get into the accuracey thing and seating bullets into the shoulder area, but many people will completely dissagree with you on this point. I have not seen all that much of a problem as long as the base of the bullet is not well into the shoulder area. Still what has to be taken into fact is the reduction of case volume when that bullet moves deep into the shoulder area. So keep that in mind as this mimmics a smaller case. Recommend you start out at the bottom of the ladder and work your way up slowly as the pressures will probably ramp up very quickly. In other words I'd hold to the 10% reduction as a good starting point for your own saftey.
good luck!
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