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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 RUM, 200g Accubond, H50BMG
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<blockquote data-quote="Brent" data-source="post: 33160" data-attributes="member: 99"><p>John,</p><p>You're right, density seems much more appropriate with H50BMG or one of the slow VV powders. </p><p></p><p>I tested 100.0, 102.0 and 104.0gr H50BMG. Pressure was about 65, 70, and 75k psi respectively. I consider 102gr a max load. </p><p>MV was also 3200, 3250, 3330 fps respectively. </p><p></p><p>I will play with the load a little more though. Primer, OAL and I'll know if it'll shoot at that speed. </p><p></p><p>I'm satisfied with 3150-3200 fps using Retumbo if not, accuracy is very good. Like you say though, 90gr is pretty low for this case, but it does seem to work just fine, heck even 84gr RL22 shot real well in the Lapua. </p><p></p><p>I wondered if RL22 or H4831 would really be too fast of powder, but couldn't resist the urge to see if things really tighten up moving to a little faster burn with less muzzle pressure. </p><p></p><p>No doubt in my mind that these cases could use more barrel length, especially if even slower powders are used. I think with a 30 caliber we just may have just about maxed out the case capacity for these powders. Maybe 40" barrels with slower than H50BMG would do better?? </p><p></p><p>I think with Retumbo we're already running in the fast burn range, probably why accuracy is what it is in the bigger 30's.</p></blockquote><p></p>
[QUOTE="Brent, post: 33160, member: 99"] John, You're right, density seems much more appropriate with H50BMG or one of the slow VV powders. I tested 100.0, 102.0 and 104.0gr H50BMG. Pressure was about 65, 70, and 75k psi respectively. I consider 102gr a max load. MV was also 3200, 3250, 3330 fps respectively. I will play with the load a little more though. Primer, OAL and I'll know if it'll shoot at that speed. I'm satisfied with 3150-3200 fps using Retumbo if not, accuracy is very good. Like you say though, 90gr is pretty low for this case, but it does seem to work just fine, heck even 84gr RL22 shot real well in the Lapua. I wondered if RL22 or H4831 would really be too fast of powder, but couldn't resist the urge to see if things really tighten up moving to a little faster burn with less muzzle pressure. No doubt in my mind that these cases could use more barrel length, especially if even slower powders are used. I think with a 30 caliber we just may have just about maxed out the case capacity for these powders. Maybe 40" barrels with slower than H50BMG would do better?? I think with Retumbo we're already running in the fast burn range, probably why accuracy is what it is in the bigger 30's. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 RUM, 200g Accubond, H50BMG
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