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Rifles, Reloading, Optics, Equipment
AR15/10 Rifles
Secret to lowering es and sd on a ar10?
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<blockquote data-quote="Pdvdh" data-source="post: 1190277" data-attributes="member: 4191"><p>I do many of the same things. In addition, I've outside neck turned 3,500 223 cases, annealed all of those case necks, purchased a Forster FL resizing die with a custom ground neck diameter to get rid of the neck expanding ball, weighed all 3,500 cases and eliminated about 8% of the outliers by weight, primer pocket uniformed all cases, flash hole de-burred all cases, weighed all powder charges to +/- 0.1 grain on a RCBS Chargemaster 1500, lubed all case necks prior to bullet seating with either Hornady Unique sizing was or Imperial sizing wax.</p><p></p><p>I'm currently crimping case necks a little with a Lee Factory Case Crimp die, after seating the bullets, in the effort to see if that helps/hurts. Seems to improve accuracy. Doesn't appear to have any affect on ES/SD. </p><p></p><p>I shoot all bullets over a triplicate chronograph setup that provides me with 4 recorded velocities for each bullet fired. I've had lower ES/SD when only shooting - say - six rounds over the chronographs. When I shoot 10 or more bullets, the ES/SD inevitably increases. I've had ES higher than 100fps with some powders. Varget is particularly finicky in the .223 case. BL-C(2) is a little better than Varget. Benchmark is better than BL-C(2).</p><p></p><p>Remington 7 1/2 primers provided a notable reduction in ES/SD with Benchmark powder, compared to Federal 205s.</p><p></p><p>I'm going to put a little more effort into it, but not much more. I don't shoot this rifle at more than 5-600yds at anything other than paper/rocks.</p><p></p><p>I'd like to be wrong, but I'm about exasperated to the point of concluding the semi-autos commonly produce higher ES/SD than fixed/bolt action rifles.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1190277, member: 4191"] I do many of the same things. In addition, I've outside neck turned 3,500 223 cases, annealed all of those case necks, purchased a Forster FL resizing die with a custom ground neck diameter to get rid of the neck expanding ball, weighed all 3,500 cases and eliminated about 8% of the outliers by weight, primer pocket uniformed all cases, flash hole de-burred all cases, weighed all powder charges to +/- 0.1 grain on a RCBS Chargemaster 1500, lubed all case necks prior to bullet seating with either Hornady Unique sizing was or Imperial sizing wax. I'm currently crimping case necks a little with a Lee Factory Case Crimp die, after seating the bullets, in the effort to see if that helps/hurts. Seems to improve accuracy. Doesn't appear to have any affect on ES/SD. I shoot all bullets over a triplicate chronograph setup that provides me with 4 recorded velocities for each bullet fired. I've had lower ES/SD when only shooting - say - six rounds over the chronographs. When I shoot 10 or more bullets, the ES/SD inevitably increases. I've had ES higher than 100fps with some powders. Varget is particularly finicky in the .223 case. BL-C(2) is a little better than Varget. Benchmark is better than BL-C(2). Remington 7 1/2 primers provided a notable reduction in ES/SD with Benchmark powder, compared to Federal 205s. I'm going to put a little more effort into it, but not much more. I don't shoot this rifle at more than 5-600yds at anything other than paper/rocks. I'd like to be wrong, but I'm about exasperated to the point of concluding the semi-autos commonly produce higher ES/SD than fixed/bolt action rifles. [/QUOTE]
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AR15/10 Rifles
Secret to lowering es and sd on a ar10?
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