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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Any ideas why my 1-8 twist 6.5mm barrel refuses to shoot 142's well
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<blockquote data-quote="bgordon" data-source="post: 23368" data-attributes="member: 519"><p><strong>Re: Any ideas why my 1-8 twist 6.5mm barrel refuses to shoot 142\'s well</strong></p><p></p><p>Ahhhhh, finally figured out what the problem is. When I prepped all the new brass I used a standard inside and outside deburring tool. You know, the type that has a 45 degree angle cut to clean up the inside and outside faces of the neck. I bought a 20 degree neck deburring tool from Sinclair and did a couple of turns on 50 pieces of brass then loaded it up with some VLD bullets.</p><p></p><p>Flyers disappeared!!!</p><p></p><p>Now the rifle is shooting 1/2 MOA with VLD bullets as well as with 120 grain Matchkings.</p><p>I went out to the range this morning and shot 40 of the 123 Lapua Scenar's loaded to kiss the lands with 48 grains of Reloader 19. Got 3124 fps average velocity with an extreme spread of 32 fps for 10 shots.</p><p>Shot 10 shots at 300 yards across the chronograph with a nice tight 1 1/4" vertical spread. The horizontal spread went 2 3/4" but the wind was gusting from 10 to 25 mph and switching directions.</p><p>Shot three 10 shot groups at 500 and let the barrel cool for 15 minutes between strings but did not set up the chronograph because it blew down in the wind at 300. None of the groups went over 1/2 moa vertical except for one low called flyer. The groups were not well centered on the target, but I attribute that to the wind switching around so greatly. All three of the 500 yard groups had less than 1 moa horizontal spread, so the high BC is super helpful in windy conditions.</p><p></p><p>It is funny how such a little thing can make so much difference. Next thing will be to retest the 140's and see if the problem disappears with them as well, even though I intend to use the Lapua 123's because they have nearly as good a BC as the 142 Matchkings but 200 fps additional velocity.</p></blockquote><p></p>
[QUOTE="bgordon, post: 23368, member: 519"] [b]Re: Any ideas why my 1-8 twist 6.5mm barrel refuses to shoot 142\'s well[/b] Ahhhhh, finally figured out what the problem is. When I prepped all the new brass I used a standard inside and outside deburring tool. You know, the type that has a 45 degree angle cut to clean up the inside and outside faces of the neck. I bought a 20 degree neck deburring tool from Sinclair and did a couple of turns on 50 pieces of brass then loaded it up with some VLD bullets. Flyers disappeared!!! Now the rifle is shooting 1/2 MOA with VLD bullets as well as with 120 grain Matchkings. I went out to the range this morning and shot 40 of the 123 Lapua Scenar's loaded to kiss the lands with 48 grains of Reloader 19. Got 3124 fps average velocity with an extreme spread of 32 fps for 10 shots. Shot 10 shots at 300 yards across the chronograph with a nice tight 1 1/4" vertical spread. The horizontal spread went 2 3/4" but the wind was gusting from 10 to 25 mph and switching directions. Shot three 10 shot groups at 500 and let the barrel cool for 15 minutes between strings but did not set up the chronograph because it blew down in the wind at 300. None of the groups went over 1/2 moa vertical except for one low called flyer. The groups were not well centered on the target, but I attribute that to the wind switching around so greatly. All three of the 500 yard groups had less than 1 moa horizontal spread, so the high BC is super helpful in windy conditions. It is funny how such a little thing can make so much difference. Next thing will be to retest the 140's and see if the problem disappears with them as well, even though I intend to use the Lapua 123's because they have nearly as good a BC as the 142 Matchkings but 200 fps additional velocity. [/QUOTE]
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Any ideas why my 1-8 twist 6.5mm barrel refuses to shoot 142's well
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