Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
A-Max problem?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Fiftydriver" data-source="post: 146690" data-attributes="member: 10"><p>You will find my friend that in most cases, a 6-284 with a 1-8 twist will be limited to around 3250 to 3300 fps with the 105 gr A-Max. </p><p></p><p>I would be currious to see how wide the lands are on that Rock barrel. I got one of Mikes 7mm barrels for my 7mm AM to shoot the 200 gr ULD RBBTs as the Lilja 3 groove barrels were tearing them apart after a few hundred rounds or less in some cases.</p><p></p><p>Well, right from the start the Rock was tearing bullets apart at any velocity. The reason, to much bullet baring surface compression.</p><p></p><p>Called up Rock Barrels, their main barrel maker worked with me, thinned the lands and now their bullets work perfectly.</p><p></p><p>I would suspect this is a similiar problem as you are seeing.</p><p> </p><p>You are just not tearing them apart but if the jacket core bond is weakened, accuracy will suffer ranging from poor groups to total bullet failure in flight.</p><p></p><p>Since this was just one bullet, I would not worry to much about it but pay attention. If those bullets seem to not make it to target like they should, make a mental note.</p><p></p><p>Good news, you can always use the 107 gr SMK as it will take alot more velocity before loosing accuracy.</p><p></p><p>My personal 6-284 will get 3550 fps with the 105 gr A-Max. Only problem is that anything over 3250 fps will cause accuracy to go to hell instantly, same with the Berger 105 gr VLDs. THe SMK can be driven to 3550 with fine accuracy all the way up with its thicker jacket.</p><p></p><p>Anyway, just something to be aware of. If your getting more then around 25% baring surface compression on your bullets from the lands, you may be having this problem and I suspect your well over that if the 6mm Rock barrels are similiar to the original 7mm Rock 5R barrels.</p><p></p><p>Again, just pay attention when your shooting. May be a one time deal, may not. Time will tell.</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 146690, member: 10"] You will find my friend that in most cases, a 6-284 with a 1-8 twist will be limited to around 3250 to 3300 fps with the 105 gr A-Max. I would be currious to see how wide the lands are on that Rock barrel. I got one of Mikes 7mm barrels for my 7mm AM to shoot the 200 gr ULD RBBTs as the Lilja 3 groove barrels were tearing them apart after a few hundred rounds or less in some cases. Well, right from the start the Rock was tearing bullets apart at any velocity. The reason, to much bullet baring surface compression. Called up Rock Barrels, their main barrel maker worked with me, thinned the lands and now their bullets work perfectly. I would suspect this is a similiar problem as you are seeing. You are just not tearing them apart but if the jacket core bond is weakened, accuracy will suffer ranging from poor groups to total bullet failure in flight. Since this was just one bullet, I would not worry to much about it but pay attention. If those bullets seem to not make it to target like they should, make a mental note. Good news, you can always use the 107 gr SMK as it will take alot more velocity before loosing accuracy. My personal 6-284 will get 3550 fps with the 105 gr A-Max. Only problem is that anything over 3250 fps will cause accuracy to go to hell instantly, same with the Berger 105 gr VLDs. THe SMK can be driven to 3550 with fine accuracy all the way up with its thicker jacket. Anyway, just something to be aware of. If your getting more then around 25% baring surface compression on your bullets from the lands, you may be having this problem and I suspect your well over that if the 6mm Rock barrels are similiar to the original 7mm Rock 5R barrels. Again, just pay attention when your shooting. May be a one time deal, may not. Time will tell. Kirby Allen(50) [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
A-Max problem?
Top