How much tension

tayhot

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Nov 26, 2009
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With redding bushings, is it possible to be too loose for lack of a better term? My 338 rum with a dummy round is .366-.365. I have the .364 bushing but when I press the brass it doesn't feel like my my regular dies do. This is my first comp die reloading
 

Rimfire

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Jul 14, 2007
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With redding bushings, is it possible to be too loose for lack of a better term? My 338 rum with a dummy round is .366-.365. I have the .364 bushing but when I press the brass it doesn't feel like my my regular dies do. This is my first comp die reloading


I often get one thou spring back so your .364 could size to .365
 

AZShooter

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Dec 12, 2005
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Tucson Az
If you are shooting this rifle as a repeater with ammo in a magazine the recoil might cause those bullets to move. I figure you know that too much neck tension might cause accuracy to suffer.

I would seriously consider getting a .363 and a .362 Then shoot the loads to see which one is the most accurate. My RCBS 300 RUM dies make a .003" difference between sized necks and loaded ammo which has worked out perfectly.
 

Greyfox

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Many of the standard dyes are set up to give very tight neck tension for a given caliber. I think they do this because of differences between the brass wall thickness from the manufacturers. This is achieved by sizing the neck down a few thousandths or more smaller, then an expander plug will open it up. This can result in a neck size that is typically tight, depending on the brand of brass you are using. When you go to bushing dyes and use a bushing that is 1-2 thousandths smaller, if feels like you have much less tension. If the bullet doesn't move into the case when pressed hard against a wood surface you are OK. The most important aspect is to have the least amount of tension that holds the bullet tight enough not to move if loaded in a magazine under recoil, and have consistency of tension from bullet to bullet.
 
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