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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Caliber and Barrel Length for New PD Barrel
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<blockquote data-quote="Fiftydriver" data-source="post: 63187" data-attributes="member: 10"><p>Varmint hunter &amp; Brian B.</p><p></p><p>We have had this discussion before several times and I fully agree with out conclusion that the 3 grooves are harder on thin jacketed match bullets sucha s the A-Max and Bergers.</p><p></p><p>Still I have only had a problem with the 6mm-284 and the like. With this round the Hornady and Berger bullets shot extremely well up to around 3200 to 3250 fps. Generally into around 1" to 1.5" groups at 500 yards. IT was only above this level that accuracy dropped off and since it was a 6mm-284, we simply need all the velocity we can get, well that was my reasoning for using the Sierra 107 anyway /ubbthreads/images/graemlins/smile.gif!!</p><p></p><p>I do not think there would be a problem at the 3100 fps and under velocity that the 243 would produce.</p><p></p><p>One interesting note converning fast twist barrels and the 3 groove rifling. I just finished a V-Block rifle for a customer that used a 1-8" .224", 30" Lilja 3 goove barrel which was chambered in 22-6mmAI. This rifle was designed to use the 80 gr Wildcat ULD bullets but until they arrive I tested some 80 gr Berger and Sierra bullets.</p><p></p><p>I was not expecting anything out of the Bergers but I tried them anyway. They shot extremely well up to 3300 fps and then simply started not landing on paper at 200 yards. I lengthened the seating depth so they were around 0.020" into the lands and tested again and was able to get them to 3590 fps and groups most would not believe.</p><p></p><p> <img src="http://www.hunt101.com/img/256969.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p>This is my personal best three shot group at the 200 yard target. Now I am not saying this rifle will average this but it will average in the 1/4" range at 200 yards and at 500 yards it is printing average groups of right at 1" even with this load which produced 3560 fps, just a tick off max.</p><p></p><p>Perhaps it is more an issue of the 6mm/3 groove combo then anything else.</p><p></p><p>Sorry for hyjacking the post for a bit /ubbthreads/images/graemlins/blush.gif.....</p><p></p><p>Good Shooting!!</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 63187, member: 10"] Varmint hunter & Brian B. We have had this discussion before several times and I fully agree with out conclusion that the 3 grooves are harder on thin jacketed match bullets sucha s the A-Max and Bergers. Still I have only had a problem with the 6mm-284 and the like. With this round the Hornady and Berger bullets shot extremely well up to around 3200 to 3250 fps. Generally into around 1" to 1.5" groups at 500 yards. IT was only above this level that accuracy dropped off and since it was a 6mm-284, we simply need all the velocity we can get, well that was my reasoning for using the Sierra 107 anyway [img]/ubbthreads/images/graemlins/smile.gif[/img]!! I do not think there would be a problem at the 3100 fps and under velocity that the 243 would produce. One interesting note converning fast twist barrels and the 3 groove rifling. I just finished a V-Block rifle for a customer that used a 1-8" .224", 30" Lilja 3 goove barrel which was chambered in 22-6mmAI. This rifle was designed to use the 80 gr Wildcat ULD bullets but until they arrive I tested some 80 gr Berger and Sierra bullets. I was not expecting anything out of the Bergers but I tried them anyway. They shot extremely well up to 3300 fps and then simply started not landing on paper at 200 yards. I lengthened the seating depth so they were around 0.020" into the lands and tested again and was able to get them to 3590 fps and groups most would not believe. [img]http://www.hunt101.com/img/256969.jpg[/img] This is my personal best three shot group at the 200 yard target. Now I am not saying this rifle will average this but it will average in the 1/4" range at 200 yards and at 500 yards it is printing average groups of right at 1" even with this load which produced 3560 fps, just a tick off max. Perhaps it is more an issue of the 6mm/3 groove combo then anything else. Sorry for hyjacking the post for a bit [img]/ubbthreads/images/graemlins/blush.gif[/img]..... Good Shooting!! Kirby Allen(50) [/QUOTE]
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Caliber and Barrel Length for New PD Barrel
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