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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet testing, again....
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<blockquote data-quote="mcdil" data-source="post: 2259421" data-attributes="member: 112571"><p>Well, you've got three there that will all have extremely high muzzle velocities. I usually don't like to recommend velocities, because I don't want to give someone a false sense of "safe" should their particular combination be showing unfavorable signs, but I'll put some benchmarks out there that I believe, based off extrapolated data only, will yield velocities at or near 60 ksi internal pressures, which shakes out to roughly what many Federal factory rounds exhibit in those calibers specifically, with the 7mm maybe 3-4 ksi less in factory form. Please realize, it's only an estimation. No lab work or field testing backs up the below estimates with those specific cartridges. We will know more in time as our company matures.</p><p></p><p>As a side note, most that do the "work up until pressure signs exist, then back off a grain or two" are many times operating in the 70 ksi range in actuality. So please understand that going in to my recommendations, that I estimate the velocities below will match stout factory load pressures with an ideal powder. Always though, your own work on your equipment will be better than anyone's suggestion, including mine.</p><p></p><p>All with 24" barrels at an estimated 60 ksi max pressure</p><p></p><p>1. 6.5 PRC with 102 gr Afterburner ~ 3450 fps - This one's the hardest to extrapolate as most data starts at 120 grains, and loads listed for 100 gr bullets are lead core with compressed charge weights. MV could be higher, but I don't want to say that off the cuff. As a point of reference, I anticipate the MV of the Creed to be 3250 fps.</p><p></p><p>2. 270 WSM with 103 gr Afterburner ~ 3650 fps - If you're lucky enough to find RL17, it may be 3700 fps.</p><p></p><p>3. 7mm Rem Mag with 117 gr Afterburner ~ 3500 fps</p></blockquote><p></p>
[QUOTE="mcdil, post: 2259421, member: 112571"] Well, you've got three there that will all have extremely high muzzle velocities. I usually don't like to recommend velocities, because I don't want to give someone a false sense of "safe" should their particular combination be showing unfavorable signs, but I'll put some benchmarks out there that I believe, based off extrapolated data only, will yield velocities at or near 60 ksi internal pressures, which shakes out to roughly what many Federal factory rounds exhibit in those calibers specifically, with the 7mm maybe 3-4 ksi less in factory form. Please realize, it's only an estimation. No lab work or field testing backs up the below estimates with those specific cartridges. We will know more in time as our company matures. As a side note, most that do the "work up until pressure signs exist, then back off a grain or two" are many times operating in the 70 ksi range in actuality. So please understand that going in to my recommendations, that I estimate the velocities below will match stout factory load pressures with an ideal powder. Always though, your own work on your equipment will be better than anyone's suggestion, including mine. All with 24" barrels at an estimated 60 ksi max pressure 1. 6.5 PRC with 102 gr Afterburner ~ 3450 fps - This one's the hardest to extrapolate as most data starts at 120 grains, and loads listed for 100 gr bullets are lead core with compressed charge weights. MV could be higher, but I don't want to say that off the cuff. As a point of reference, I anticipate the MV of the Creed to be 3250 fps. 2. 270 WSM with 103 gr Afterburner ~ 3650 fps - If you're lucky enough to find RL17, it may be 3700 fps. 3. 7mm Rem Mag with 117 gr Afterburner ~ 3500 fps [/QUOTE]
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Bullet testing, again....
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