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Rifles, Reloading, Optics, Equipment
Reloading
Problem with deviation on my handloads
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<blockquote data-quote="rscott5028" data-source="post: 651645" data-attributes="member: 24624"><p>What Bart said. Plus a few random thoughts...</p><p> </p><p>Chrony may be too close and thus affected by muzzle blast. Move it out as far as the cable will allow. </p><p> </p><p>Shade the chrony from variable lighting such as clouds moving overhead. </p><p> </p><p>Shade the cartridges from direct sun/heat. </p><p> </p><p>Consistent brass. Same lot. Not mixing headstamps. Norma is about the best for 7RM. But, they can all be good with prep/sorting/culling. </p><p> </p><p>Good brass prep including consistent neck wall thickness. Turn necks if necessary. </p><p> </p><p>Neck ID should be .001-.002" less than caliber. More is just overworking brass. Less than .001" is a problem. </p><p> </p><p>Uniform primer pockets and seat primers consistently. Debur flash holes. </p><p> </p><p>Norma brass, H4831sc, gm215m, and 168g Bergers work well for me. You've got too many bullets and variables. Change only one thing at a time. </p><p> </p><p>1-2 thousandths jam could be a problem as some could be touching and some not. Go at least .010" jump or jam. Just not right at the threshold since your measurement may not even be that precise. </p><p> </p><p>Ladder test to find nodes with better grouping and ES/SD. </p><p> </p><p>Use the chrony while verifying loads at long range paying close attention to vertical spread. </p><p> </p><p>-- richard</p></blockquote><p></p>
[QUOTE="rscott5028, post: 651645, member: 24624"] What Bart said. Plus a few random thoughts... Chrony may be too close and thus affected by muzzle blast. Move it out as far as the cable will allow. Shade the chrony from variable lighting such as clouds moving overhead. Shade the cartridges from direct sun/heat. Consistent brass. Same lot. Not mixing headstamps. Norma is about the best for 7RM. But, they can all be good with prep/sorting/culling. Good brass prep including consistent neck wall thickness. Turn necks if necessary. Neck ID should be .001-.002" less than caliber. More is just overworking brass. Less than .001" is a problem. Uniform primer pockets and seat primers consistently. Debur flash holes. Norma brass, H4831sc, gm215m, and 168g Bergers work well for me. You've got too many bullets and variables. Change only one thing at a time. 1-2 thousandths jam could be a problem as some could be touching and some not. Go at least .010" jump or jam. Just not right at the threshold since your measurement may not even be that precise. Ladder test to find nodes with better grouping and ES/SD. Use the chrony while verifying loads at long range paying close attention to vertical spread. -- richard [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Problem with deviation on my handloads
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