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Long Range Hunting & Shooting
1000 yds...Next step?
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<blockquote data-quote="Bart B" data-source="post: 659323" data-attributes="member: 5302"><p>I and others have shot Sierra 200 HPMK's in SAAMI spec .308 Win. chambers and they do just fine. Watched a guy in 1997 break the 600 yard prone record with aperture sights putting 19 of 'em inside 4 inches at 600 yards from prone; one just barely went outside that. All from a SAAMI spec chamber with Rem. BR .308 cases with Rem. 7.5 primers and 48 grains of IMR4350.</p><p></p><p>Folks have got several dozen reloads on .308 cases properly full length sizing them. Most I've got was 47 and a friend nearby got 57; all with normal max loads. No annealing was done whatsoever. You just need to size fired case body diameters down no more than 2 thousandths and set the case shoulder back the same amount. The die's neck needs to be about 2 thousandths smaller than a loaded round's neck diameter. .308 fired cases so sized has shot test groups at 600 yards smaller than current benchrest records; from pre-'64 classic box magazine Win. 70 based rifles at that. Benchresters today are doing the same dimensional changes with the popular 6mm cases they full length size, but reduce body diameters and set shoulders back only about 1 thousandths.</p><p></p><p>If neck only sizing doesn't hurt accuracy, why have the best scores and records set in high power match rifle competition been done with full length sized cases? Would the benchresters have switched over to full length sizing if it didn't produce better accuracy?</p></blockquote><p></p>
[QUOTE="Bart B, post: 659323, member: 5302"] I and others have shot Sierra 200 HPMK's in SAAMI spec .308 Win. chambers and they do just fine. Watched a guy in 1997 break the 600 yard prone record with aperture sights putting 19 of 'em inside 4 inches at 600 yards from prone; one just barely went outside that. All from a SAAMI spec chamber with Rem. BR .308 cases with Rem. 7.5 primers and 48 grains of IMR4350. Folks have got several dozen reloads on .308 cases properly full length sizing them. Most I've got was 47 and a friend nearby got 57; all with normal max loads. No annealing was done whatsoever. You just need to size fired case body diameters down no more than 2 thousandths and set the case shoulder back the same amount. The die's neck needs to be about 2 thousandths smaller than a loaded round's neck diameter. .308 fired cases so sized has shot test groups at 600 yards smaller than current benchrest records; from pre-'64 classic box magazine Win. 70 based rifles at that. Benchresters today are doing the same dimensional changes with the popular 6mm cases they full length size, but reduce body diameters and set shoulders back only about 1 thousandths. If neck only sizing doesn't hurt accuracy, why have the best scores and records set in high power match rifle competition been done with full length sized cases? Would the benchresters have switched over to full length sizing if it didn't produce better accuracy? [/QUOTE]
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