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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bolt Lug Contact & how it effects groups
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<blockquote data-quote="gonehuntingagain" data-source="post: 106537" data-attributes="member: 1206"><p>Ok guys, I searched the site to try to find my answer, but didn't really find what I was looking for. After trying some 180gr Accubonds last weekend with my Rem 700 VSLH, I was a little dissapointed to say the least. I was using Varget, Win brass (prepped, but not sorted by weight) with Fed 210 primers. </p><p>There were a few funky things happening. Up until the last loads (44.8 and 45gr (max listed load)), the loads seemed to string up and left - I didn't look at the target after each shot, only after 3 shots would I check the target. When I got to the max listed loads, the groups seemed to lose the up &amp; left trend and would shoot a triangle shaped group. The load w/ 45gr shot a 3" group. All shots were taken at 300 yards, and I caught one of the few days of the year that there was little to no wind. It didn't seem to matter if I waited 5 min between shots or not. The action is skim bedded, and there is no interference between the stock and barrel all the way to the recoil lug - I can fit a business card in there. </p><p></p><p>The 45gr load velocities were 2652.5, 2650.7, 2639.3 (chrono was a Pact MK IV 6' away from the muzzle).</p><p></p><p>I thought I read a post by Kirby that said bad lug contact would cause more issues as the pressure got higher, but with my rifle it doesn't seem to be the case, just a whole lot of wierdness. How much does the bolt lug contact play a role in the rifle's accuracy? Would it be worth it to have the receiver trued, and have the factory barrel chamber recut so it is not the sloppy factory Remington chamber (money considerations here - not able to buy a new barrel at this time in addition to having the receiver trued).</p><p></p><p>Here are some pictures to illustrate my issues.</p><p></p><p>Left bolt lug - the shiney spot was not form the flash - it appears that only a small portion of the lug has been making contact.</p><p></p><p><img src="http://myweb.cableone.net/abraden/images/Hunting/308_left_lug.JPG" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p></p><p>Right bolt lug - small contact patch as well.</p><p></p><p></p><p> <img src="http://myweb.cableone.net/abraden/images/Hunting/308_right_lug.JPG" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p>Stringing. For some perspective, the sticker on the target is 3 7/8" wide, 1 7/16" tall.</p><p></p><p><img src="http://myweb.cableone.net/abraden/images/Hunting/upandleft.JPG" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p>This one was with 45gr Varget, about 3.5" at the widest point.</p><p></p><p><img src="http://myweb.cableone.net/abraden/images/Hunting/getting_better.JPG" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p></p><p>Maybe my expectations are a little high for a factory rifle...</p></blockquote><p></p>
[QUOTE="gonehuntingagain, post: 106537, member: 1206"] Ok guys, I searched the site to try to find my answer, but didn't really find what I was looking for. After trying some 180gr Accubonds last weekend with my Rem 700 VSLH, I was a little dissapointed to say the least. I was using Varget, Win brass (prepped, but not sorted by weight) with Fed 210 primers. There were a few funky things happening. Up until the last loads (44.8 and 45gr (max listed load)), the loads seemed to string up and left - I didn't look at the target after each shot, only after 3 shots would I check the target. When I got to the max listed loads, the groups seemed to lose the up & left trend and would shoot a triangle shaped group. The load w/ 45gr shot a 3" group. All shots were taken at 300 yards, and I caught one of the few days of the year that there was little to no wind. It didn't seem to matter if I waited 5 min between shots or not. The action is skim bedded, and there is no interference between the stock and barrel all the way to the recoil lug - I can fit a business card in there. The 45gr load velocities were 2652.5, 2650.7, 2639.3 (chrono was a Pact MK IV 6' away from the muzzle). I thought I read a post by Kirby that said bad lug contact would cause more issues as the pressure got higher, but with my rifle it doesn't seem to be the case, just a whole lot of wierdness. How much does the bolt lug contact play a role in the rifle's accuracy? Would it be worth it to have the receiver trued, and have the factory barrel chamber recut so it is not the sloppy factory Remington chamber (money considerations here - not able to buy a new barrel at this time in addition to having the receiver trued). Here are some pictures to illustrate my issues. Left bolt lug - the shiney spot was not form the flash - it appears that only a small portion of the lug has been making contact. [img]http://myweb.cableone.net/abraden/images/Hunting/308_left_lug.JPG[/img] Right bolt lug - small contact patch as well. [img]http://myweb.cableone.net/abraden/images/Hunting/308_right_lug.JPG[/img] Stringing. For some perspective, the sticker on the target is 3 7/8" wide, 1 7/16" tall. [img]http://myweb.cableone.net/abraden/images/Hunting/upandleft.JPG[/img] This one was with 45gr Varget, about 3.5" at the widest point. [img]http://myweb.cableone.net/abraden/images/Hunting/getting_better.JPG[/img] Maybe my expectations are a little high for a factory rifle... [/QUOTE]
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