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Rifles, Reloading, Optics, Equipment
Reloading
any .470-.473 bolt face small primer usage
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<blockquote data-quote="Hugnot" data-source="post: 3101292" data-attributes="member: 115658"><p>Use other's experience - small rifle primer data for .473 diameter cartridges is extremely rare. Often getting stuff to work good is a cooperative venture.</p><p></p><p>I use CCI 41'with extruded powders not to exceed 45 grains in - 6mm CM. 6.5 CM, .243 Win. reformed SP Peterson .260 Rem brass. I got a real good deal on CCI 41 & I shoot lots of them in my AR (mil spec primer).</p><p></p><p>I use Rem 7 1/2's with ball powders like RS Hunter & Staball 6.5 in the same cartridges.</p><p></p><p>I use whatever I can get at cheapest prices.</p><p></p><p>Some interesting info:</p><p></p><p>[URL unfurl="true"]https://arxiv.org/ftp/arxiv/papers/1203/1203.2701.pdf[/URL]</p><p></p><p>[ATTACH]570158[/ATTACH]</p><p></p><p>Looking at Table 1, I sees that the Rem 7 1/2 is a real frisky small primer generating about 2303 K Pascals, real close to the CCI 200, a large rifle primer.</p><p></p><p>6.5 CM - max charges of 47 grains of R-S Hunter, velocities about 3,000 fps, accuracy was greatly improved with the Rem 7 1/2 vs CCI 41.</p><p>CCI 41 -300 yards double clusters of bullet holes appeared in targets about 4 inches apart.</p><p>Rem 7 1/2 - 300 yards single group about 4 inches.</p><p>Not award winning fine accuracy but it shows something.</p><p></p><p>6.5 CM - 123 H ELDM, with Rem 7 1/2's & 44.5 of Win Staball 6.5 - 100 yard groups</p><p></p><p>6 CM - Barnes Match Burner with CCI 41 & 42.0 AA 4350. - 100 yard groups.</p><p></p><p>Brass for both was once fired Fed 6.5 CM, small primer, both neck turned.</p><p></p><p> [ATTACH]570153[/ATTACH][ATTACH]570155[/ATTACH]</p><p></p><p>Some other stuff;</p><p></p><p>[ATTACH]570157[/ATTACH]</p><p></p><p>Stats for the 6.5 CM load, Loading a big amount of 6.5 ammo using the 123 ELDM at 95 % probability (chop off both end tails of bell shaped curve, 2.5 at each end) indicates a average spread of about 18 fps. This could probably be improved with more care in loading ammo & timing of shots to get uniform barrel temps.</p><p></p><p>My attempt to make .22-.250 small primer brass from Fed 6.5 CM brass did not work out, I got lots of stress fracture indications at right angles to forces at shoulders. If somebody encouraged Privi to produce small primer .22-.250 brass it would sell good.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 3101292, member: 115658"] Use other's experience - small rifle primer data for .473 diameter cartridges is extremely rare. Often getting stuff to work good is a cooperative venture. I use CCI 41'with extruded powders not to exceed 45 grains in - 6mm CM. 6.5 CM, .243 Win. reformed SP Peterson .260 Rem brass. I got a real good deal on CCI 41 & I shoot lots of them in my AR (mil spec primer). I use Rem 7 1/2's with ball powders like RS Hunter & Staball 6.5 in the same cartridges. I use whatever I can get at cheapest prices. Some interesting info: [URL unfurl="true"]https://arxiv.org/ftp/arxiv/papers/1203/1203.2701.pdf[/URL] [ATTACH alt="Screenshot (546).png"]570158[/ATTACH] Looking at Table 1, I sees that the Rem 7 1/2 is a real frisky small primer generating about 2303 K Pascals, real close to the CCI 200, a large rifle primer. 6.5 CM - max charges of 47 grains of R-S Hunter, velocities about 3,000 fps, accuracy was greatly improved with the Rem 7 1/2 vs CCI 41. CCI 41 -300 yards double clusters of bullet holes appeared in targets about 4 inches apart. Rem 7 1/2 - 300 yards single group about 4 inches. Not award winning fine accuracy but it shows something. 6.5 CM - 123 H ELDM, with Rem 7 1/2's & 44.5 of Win Staball 6.5 - 100 yard groups 6 CM - Barnes Match Burner with CCI 41 & 42.0 AA 4350. - 100 yard groups. Brass for both was once fired Fed 6.5 CM, small primer, both neck turned. [ATTACH alt="IMG_2034.JPG"]570153[/ATTACH][ATTACH alt="IMG_1702 (2).JPG"]570155[/ATTACH] Some other stuff; [ATTACH alt="Screenshot (911).png"]570157[/ATTACH] Stats for the 6.5 CM load, Loading a big amount of 6.5 ammo using the 123 ELDM at 95 % probability (chop off both end tails of bell shaped curve, 2.5 at each end) indicates a average spread of about 18 fps. This could probably be improved with more care in loading ammo & timing of shots to get uniform barrel temps. My attempt to make .22-.250 small primer brass from Fed 6.5 CM brass did not work out, I got lots of stress fracture indications at right angles to forces at shoulders. If somebody encouraged Privi to produce small primer .22-.250 brass it would sell good. [/QUOTE]
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any .470-.473 bolt face small primer usage
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