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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
240 SMK, H50BMG powder, 300RUM...anyone?
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<blockquote data-quote="jmden" data-source="post: 309582" data-attributes="member: 1742"><p>Well...went out and shot some H50BMG under 240's. </p><p> </p><p>This was quick and dirty. Fired 'em all in less than five minutes up an old logging road. Good lighting conditions, so fairly confident in the chrono numbers. Chrono didn't miss a beat. </p><p> </p><p>I've had this powder probably 4-5 years sitting in the shop. Used some old fired brass (some fired many times--don't have much nice new prepped brass and don't want to damage what I have carefully prepped in wild hair load development at the moment) I had lying around as seems like using new brass always results in less pressure signs showing and lower velocities--sometimes seems like new brass doesn't give the true picture.</p><p> </p><p>Didn't start getting interesting until I got to 104g. Started at 98g in the mid 2700's. </p><p> </p><p>Yes, compressed--haven't done much of that--any pointers? </p><p> </p><p>300RUM, 26", 1-10", approx. 65 deg., ~3.775" COL, seated to lands, FED 215M:</p><p> </p><p>(corrected MV using JBM ballistics for chrono 20' from muzzle)</p><p> </p><p>104g--2932--small hint of ejector pin mark, primer cratered a bit</p><p>105g--same--no ejector pin mark at all, primer cratered a bit (almost makes me wonder if I loaded what I thought was 105 at 104, but I was pretty careful--maybe it's just a big node?)</p><p>106g--3007--definite ejector pin mark (partly shiny) and cratered primer</p><p> </p><p>Have to get out and mess around with accuracy potential and velocity ES.</p><p> </p><p>Use this info at your own risk. Maybe it'll help someone else out.</p></blockquote><p></p>
[QUOTE="jmden, post: 309582, member: 1742"] Well...went out and shot some H50BMG under 240's. This was quick and dirty. Fired 'em all in less than five minutes up an old logging road. Good lighting conditions, so fairly confident in the chrono numbers. Chrono didn't miss a beat. I've had this powder probably 4-5 years sitting in the shop. Used some old fired brass (some fired many times--don't have much nice new prepped brass and don't want to damage what I have carefully prepped in wild hair load development at the moment) I had lying around as seems like using new brass always results in less pressure signs showing and lower velocities--sometimes seems like new brass doesn't give the true picture. Didn't start getting interesting until I got to 104g. Started at 98g in the mid 2700's. Yes, compressed--haven't done much of that--any pointers? 300RUM, 26", 1-10", approx. 65 deg., ~3.775" COL, seated to lands, FED 215M: (corrected MV using JBM ballistics for chrono 20' from muzzle) 104g--2932--small hint of ejector pin mark, primer cratered a bit 105g--same--no ejector pin mark at all, primer cratered a bit (almost makes me wonder if I loaded what I thought was 105 at 104, but I was pretty careful--maybe it's just a big node?) 106g--3007--definite ejector pin mark (partly shiny) and cratered primer Have to get out and mess around with accuracy potential and velocity ES. Use this info at your own risk. Maybe it'll help someone else out. [/QUOTE]
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240 SMK, H50BMG powder, 300RUM...anyone?
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