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Rifles, Reloading, Optics, Equipment
Reloading
RL10X=speed,speed, and more speed!
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<blockquote data-quote="Fitch" data-source="post: 351077" data-attributes="member: 19372"><p><strong>Huh???</strong></p><p></p><p>Load data is indeed scarce. For those situations I use QuickLoad - been using it a lot for 3+ years now. I use it to get in the ballpark, then back off 2 grains and work up.</p><p> </p><p>Easy does it.</p><p> </p><p>I think 27.5g is a pretty hot load - it is also a compressed load of close to 110% - I'd think you have to use a drop tube to get it in there. The QuickLoad model predicts about 4,000 fps out of a 24" barrel with a 27.5g load of RL10X which isn't that far off what you are measuring.</p><p> </p><p>I'd estimate that load at between 7,500 and 10,000 psi over the SAAMI max (55,000 psi) for the brass based on a QuickLoad model optimized for my CZ527 American sporter (30.49 water grain case capacity - 2.272" COL). It may or may not show pressure signs. Bolt lift and primer pockets sometimes don't show up until one is way way over. </p><p> </p><p>If you are at 65,000 psi @ 70F as I estimate, you are about 5,000 psi short of where you will get brass flow and rapid primer pocket expansion. Be advised on a hot day, say 110F, your pressure could easily exceed 70,000 psi.</p><p> </p><p>At 25.5g I was getting around 3700 fps with RL10X. It didn't group well so I stopped experimenting with it. </p><p> </p><p>There is no magic. Velocities of 200 to 300 fps over max loads with other good powders optimized for the bullet are only possible with excessive pressure. </p><p> </p><p>As Ken Ohler once wrote, "any reloader can get velocities faster than factory ammo if they don't measure pressure."</p><p> </p><p>YMMV.</p><p> </p><p>Fitch</p></blockquote><p></p>
[QUOTE="Fitch, post: 351077, member: 19372"] [b]Huh???[/b] Load data is indeed scarce. For those situations I use QuickLoad - been using it a lot for 3+ years now. I use it to get in the ballpark, then back off 2 grains and work up. Easy does it. I think 27.5g is a pretty hot load - it is also a compressed load of close to 110% - I'd think you have to use a drop tube to get it in there. The QuickLoad model predicts about 4,000 fps out of a 24" barrel with a 27.5g load of RL10X which isn't that far off what you are measuring. I'd estimate that load at between 7,500 and 10,000 psi over the SAAMI max (55,000 psi) for the brass based on a QuickLoad model optimized for my CZ527 American sporter (30.49 water grain case capacity - 2.272" COL). It may or may not show pressure signs. Bolt lift and primer pockets sometimes don't show up until one is way way over. If you are at 65,000 psi @ 70F as I estimate, you are about 5,000 psi short of where you will get brass flow and rapid primer pocket expansion. Be advised on a hot day, say 110F, your pressure could easily exceed 70,000 psi. At 25.5g I was getting around 3700 fps with RL10X. It didn't group well so I stopped experimenting with it. There is no magic. Velocities of 200 to 300 fps over max loads with other good powders optimized for the bullet are only possible with excessive pressure. As Ken Ohler once wrote, "any reloader can get velocities faster than factory ammo if they don't measure pressure." YMMV. Fitch [/QUOTE]
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Reloading
RL10X=speed,speed, and more speed!
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