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Picture of Tanoose
posted
Whats the story with gas checks , are they to be used with lead bullets when you reach a certain velocity? Ive been shooting cast performance 460 WFNGC from 1200-1500 fps, and was thinking on tring some 500 grain bullets from Oregon Trail but i noticed they were plainj base not gas checkes.
 
Posts: 869 | Location: Bellerose,NY USA | Registered: 27 July 2001Reply With Quote
<Don Martin29>
posted
I am not sure what cartridge or gun you are loading for?

In my 38-55 schuetzen rifles I shoot plain base and in my .375 H&H and Improved I use gas checked bullets. I don't have a cut off number where to use them or not but the handbooks might suggest one.
 
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Plain base ought to work fine at those load levels.

My version is that you use gas checks when the mold is cut for them, but you usually don't need a gas checked design for loads less than 1600 fps in a rifle. I have never had any luck shooting gas check bullets without the gas check except in extremely mild loads.

In a straight case, if the bullet you want is only available in plain base, you can go a good bit hotter by using an upside down gas check. I only do this when the GC will touch the powder.
 
Posts: 1570 | Location: Base of the Blue Ridge | Registered: 04 November 2002Reply With Quote
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I have 1000 38 gas ckecks and 1000 45 gas check ,,,both in original IDEAL boxes, along with Herters 38 Cal.Pistol jackets all for $50.plus shipping....Al boxes are in very good shape,,,nice for collection as they are old.....EMAIL at janehal@yahoo.com
 
Posts: 93 | Location: Evart Mich USA | Registered: 19 March 2002Reply With Quote
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Picture of Paul H
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Unfortunately it isn't as simple as saying you need gas checks at a certain velocity.

The point at which a gas check provides a benefit to prevent leading is a factor of the guns dimensions, ie throat and bore, bullet dimensions, bullet hardness, operating pressure of the cartridge, and velocity.

As a general rule, plainbase bullets require (I hasten to say tighter) a better match of chamber/bore dimensions, and a more limited range of velocities. Gas check bullets are more tolleranct of dimensional variances in the gun, and can generally be run faster w/o leading.

I'm assuming from your post that you are shooting a 45-70. I'd also guess that at the velocities you are running, you shouldn't have problems with leading.

One thing to note, if you do get leading with the plainbase bullets, run a few gas check bullets through the gun, and they'll take the leading right out.
 
Posts: 7213 | Location: Alaska | Registered: 27 February 2001Reply With Quote
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