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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
22-250 witha 8" twist
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<blockquote data-quote="Fiftydriver" data-source="post: 158157" data-attributes="member: 10"><p><strong>Re: 22-250 witha 8\" twist</strong></p><p></p><p>VH,</p><p></p><p>I can not say if the 3 groove has deeper grooves or not. I have never asked Dan Lilja about that. If they do that would certainly effect this in some way.</p><p></p><p>TO that point however, I have tested this theory in my Allen Magnums extensively with many different rifling designs. In the Lilja 3 groove barrels I get issues with some of the really heavy Wildcat Bullets in fast twist barrels so I tested some Rock 5R barrels. THey were even worse then the Lilja at tearing apart bullets. This example was with the 7mm AM shooting 200 gr ULD RBBTs built on J4 jackets.</p><p></p><p>I had Rock barrels redesign the 5R to a very thin land design. Roughly 1/3 of its original land width with no change to depth of groove and the problem totally went way. Even more, I was able to increase velocity nearly 100 fps with no bullet failures to this point.</p><p></p><p>So that tells me its more to do with baring surface compression percentage then anything else.</p><p></p><p>Still, if the 3 groove has deeper grooves, that would not help any with the thin jacketed match bullets.</p><p></p><p>Good point!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 158157, member: 10"] [b]Re: 22-250 witha 8\" twist[/b] VH, I can not say if the 3 groove has deeper grooves or not. I have never asked Dan Lilja about that. If they do that would certainly effect this in some way. TO that point however, I have tested this theory in my Allen Magnums extensively with many different rifling designs. In the Lilja 3 groove barrels I get issues with some of the really heavy Wildcat Bullets in fast twist barrels so I tested some Rock 5R barrels. THey were even worse then the Lilja at tearing apart bullets. This example was with the 7mm AM shooting 200 gr ULD RBBTs built on J4 jackets. I had Rock barrels redesign the 5R to a very thin land design. Roughly 1/3 of its original land width with no change to depth of groove and the problem totally went way. Even more, I was able to increase velocity nearly 100 fps with no bullet failures to this point. So that tells me its more to do with baring surface compression percentage then anything else. Still, if the 3 groove has deeper grooves, that would not help any with the thin jacketed match bullets. Good point!! Kirby Allen(50) [/QUOTE]
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22-250 witha 8" twist
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