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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm RUM and H50BMG Velocity Data
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<blockquote data-quote="dwm" data-source="post: 28326" data-attributes="member: 1136"><p>Hey guys, I have some 7MM RUM - H50BMG data.</p><p></p><p>REM 700 action</p><p>Choate Varmint Stock (screwed a 1 1/2"W x 8"L strip of aluminum under the forend and under the back of the Choate stock to help it ride the rest better, slides really smooth now.)</p><p> </p><p>Pacnor Super Match, 1 in 11 twist - 28 inch barrel, not counting muzzle break, fully bedded.</p><p>Factory trigger set to 1.5 pounds</p><p></p><p>Weather: </p><p>Temp: 81-86 degrees, 60-70% humidity, close to sea level.</p><p>Wind: 0-2</p><p></p><p>Cases, full length sized with Hornady FL sizing die. Case necks turned to 0.012- thickness. Don't have a small enough bushing for the Redding neck die yet.</p><p></p><p>Bullets seated partially into the lands.</p><p></p><p>Fed GM215M primers</p><p>H50BMG powder, all charges weighed to +0.1 grains</p><p>Sierra 168 HPBT Match bullets</p><p></p><p>Hodgdon H50BMG load data:</p><p>Start: 94 grains Max: 100 grains</p><p></p><p>Group 1 - 94 grains</p><p>3134, 3303(?), 3104, 3238, 3210</p><p></p><p>Group 2 - 94.5 grains</p><p>3256,3143, 3224,3249, 3198</p><p></p><p>Group 3 - 95 grains</p><p>3228, 3236, 3244, 3226, 3230</p><p></p><p>Group 4 - 96 grains</p><p>3266, 3277, 3281, 3287</p><p></p><p>Group 5 - 97 grains</p><p>3260, 3251, 3258,</p><p></p><p>Group 6 - 98 grains (new data from here down)</p><p>3223, 3269, 3264, 3257, 3244, 3257, 3264</p><p></p><p>Group 7 - 99 grains</p><p>3310, 3294, 3282, 3273, 3280, 3281, 3291, 3309</p><p>3292, 3300</p><p></p><p>Group 8 - 100 grains</p><p>3315, 3346,3336, 3336, 3309</p><p></p><p>No pressure signs at all, no marks on any cases, good looking primers. Looks like I could continue safely above 100 grains. The temperature was a little low for Texas though, not sure how these will do in the mid 90s.</p><p></p><p>Groups are getting smaller, several groups went ~1/2 inch. (Maybe my shooting is improving.)</p><p></p><p>I guess the whole point here is that H50BMG is shooting as good or better for me than Retumbo so far. The H50BMG velocity is good and it has a definite pressure advantage.</p><p></p><p>Will this help the throat/barrel last longer?</p><p></p><p>Doug</p><p></p><p>[ 09-03-2003: Message edited by: dwm ]</p></blockquote><p></p>
[QUOTE="dwm, post: 28326, member: 1136"] Hey guys, I have some 7MM RUM - H50BMG data. REM 700 action Choate Varmint Stock (screwed a 1 1/2"W x 8"L strip of aluminum under the forend and under the back of the Choate stock to help it ride the rest better, slides really smooth now.) Pacnor Super Match, 1 in 11 twist - 28 inch barrel, not counting muzzle break, fully bedded. Factory trigger set to 1.5 pounds Weather: Temp: 81-86 degrees, 60-70% humidity, close to sea level. Wind: 0-2 Cases, full length sized with Hornady FL sizing die. Case necks turned to 0.012- thickness. Don't have a small enough bushing for the Redding neck die yet. Bullets seated partially into the lands. Fed GM215M primers H50BMG powder, all charges weighed to +0.1 grains Sierra 168 HPBT Match bullets Hodgdon H50BMG load data: Start: 94 grains Max: 100 grains Group 1 - 94 grains 3134, 3303(?), 3104, 3238, 3210 Group 2 - 94.5 grains 3256,3143, 3224,3249, 3198 Group 3 - 95 grains 3228, 3236, 3244, 3226, 3230 Group 4 - 96 grains 3266, 3277, 3281, 3287 Group 5 - 97 grains 3260, 3251, 3258, Group 6 - 98 grains (new data from here down) 3223, 3269, 3264, 3257, 3244, 3257, 3264 Group 7 - 99 grains 3310, 3294, 3282, 3273, 3280, 3281, 3291, 3309 3292, 3300 Group 8 - 100 grains 3315, 3346,3336, 3336, 3309 No pressure signs at all, no marks on any cases, good looking primers. Looks like I could continue safely above 100 grains. The temperature was a little low for Texas though, not sure how these will do in the mid 90s. Groups are getting smaller, several groups went ~1/2 inch. (Maybe my shooting is improving.) I guess the whole point here is that H50BMG is shooting as good or better for me than Retumbo so far. The H50BMG velocity is good and it has a definite pressure advantage. Will this help the throat/barrel last longer? Doug [ 09-03-2003: Message edited by: dwm ] [/QUOTE]
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7mm RUM and H50BMG Velocity Data
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