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Long Range Hunting & Shooting
advice on dialing in a load
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<blockquote data-quote="benchracer" data-source="post: 827677" data-attributes="member: 22069"><p>I agree with other posters regarding cleaning between groups. Start with a clean barrel. Shoot 3 fouling shots. Begin testing for seating depth, shooting in "round robin" fashion, using the method described here:</p><p> </p><p><a href="http://www.longrangehunting.com/forums/f28/getting-best-precision-accuracy-berger-vld-bullets-your-rifle-40204/" target="_blank">http://www.longrangehunting.com/forums/f28/getting-best-precision-accuracy-berger-vld-bullets-your-rifle-40204/</a></p><p> </p><p>As detailed in the above referenced procedure, you should be working from touching the lands to .120 off the lands in .040 increments. I believe your total testing depth of .040 is too small and that your test increments are too small.</p><p> </p><p>You have the right idea about using a low to mid range powder charge for your seating depth test. In a modern rifle, book 6.5x55 loads are generally VERY light loads. Hodgdon shows a max of 46 grains using the traditionally low pressure restrictions for this cartridge. You can most likely exceed this by a good bit. Do your homework, consult multiple sources, and work up carefully to max in your rifle.</p><p> </p><p>When you do your powder charge workup, I recommend using this procedure:</p><p> </p><p><a href="http://optimalchargeweight.embarqspace.com/#/ocw-instructions/4529817134" target="_blank">OCW Overview - Dan Newberry's OCW Load Development System</a></p><p> </p><p>I did the same thing with my Swede a few years ago using H4831 and 140g Berger VLD's. I used .260 Remington max loads for comparison to give me a general idea of where my max should be.</p><p> </p><p>I found my best load just a hair above the listed max for a .260 Remington with a base-to-tip COAL of 3.020. With that load, my rifle is shooting well below .5" groups @ 100 yards. I have shot it to 600 yards with excellent results, limited mostly by my poor wind reading skills.</p></blockquote><p></p>
[QUOTE="benchracer, post: 827677, member: 22069"] I agree with other posters regarding cleaning between groups. Start with a clean barrel. Shoot 3 fouling shots. Begin testing for seating depth, shooting in "round robin" fashion, using the method described here: [URL]http://www.longrangehunting.com/forums/f28/getting-best-precision-accuracy-berger-vld-bullets-your-rifle-40204/[/URL] As detailed in the above referenced procedure, you should be working from touching the lands to .120 off the lands in .040 increments. I believe your total testing depth of .040 is too small and that your test increments are too small. You have the right idea about using a low to mid range powder charge for your seating depth test. In a modern rifle, book 6.5x55 loads are generally VERY light loads. Hodgdon shows a max of 46 grains using the traditionally low pressure restrictions for this cartridge. You can most likely exceed this by a good bit. Do your homework, consult multiple sources, and work up carefully to max in your rifle. When you do your powder charge workup, I recommend using this procedure: [url=http://optimalchargeweight.embarqspace.com/#/ocw-instructions/4529817134]OCW Overview - Dan Newberry's OCW Load Development System[/url] I did the same thing with my Swede a few years ago using H4831 and 140g Berger VLD's. I used .260 Remington max loads for comparison to give me a general idea of where my max should be. I found my best load just a hair above the listed max for a .260 Remington with a base-to-tip COAL of 3.020. With that load, my rifle is shooting well below .5" groups @ 100 yards. I have shot it to 600 yards with excellent results, limited mostly by my poor wind reading skills. [/QUOTE]
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