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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
More range testing with 338 Allen Magnum XHS rifle....
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<blockquote data-quote="Fiftydriver" data-source="post: 155783" data-attributes="member: 10"><p>Scott,</p><p></p><p>Good to see you on LRH!!! I tested US869 in my 510 Allen Magnum and I believe Kieth Pagel did an article for the upcoming VHP about this wildcat and also my 50 Allen Tactical as well for those not interested in an improved 50 BMG style round.</p><p></p><p>I tested WC872, US869, H-50BMG and VV 20N29 in my 510 AM and found that all worked very well in this chambering which has roughly 30 grains more usible powder capacity then the standard 50 BMG.</p><p></p><p>All powders worked much more consistantly with the heavy bullets then the standard 750 gr A-Max at least from a velocity consistancy stand point.</p><p></p><p>You are correct that WC872 has a very high graphite content compared to other ball powders. IF you do not run it to its upper end pressure ranges, it burns very dirty. It works well in the BMG and 510 AM but again, you can not get working pressures up high enough for it to burn cleanly, well, as clean as it will burn anyway!! /ubbthreads/images/graemlins/grin.gif</p><p></p><p>In my testing with my lots of US869, the burn rate in the BMG was slightly faster then average for H-50BMG. I am sure there are some lot to lot variations with the new powder as there generally is. This happened when Hodgdon brought Retumbo to the market as well and now that seems to have settled down to where lot to lot variations are pretty tight with Retumbo.</p><p></p><p>In my smaller bore Allen Magnums US869 often resembles a burn rate much closer to Retumbo then the slower burning powders. </p><p></p><p>In the 50 cal rounds on the BMG case it seems that it has a slower burn rate personality.</p><p></p><p>I have not tested it in my 50 BMG or 510 AM for temp change variation but I have in my 257 Allen Mag, 270 Allen Mag, 7mm Allen Mag and 338 Allen Mag and in every case it was nearly identical to that of WC872.</p><p></p><p>WC872 also has a much more apporpriate burn rate for these chambering as well and dramatically cheaper to shoot so I have dropped US869 in favor of WC872.</p><p></p><p>Do not read that as saying I do not think its a good powder. I believe it will be about the best powder there is for my new 300 Allen Xpress as early tests have proven very impressive with that round and this powder easily pushing slighly over 3200 fps with the 240 gr SMK.</p><p></p><p>As far as the best powders for my 510 AM, right now for the 750 gr A-Max it looks like H-50BMG loaded to around 2770 fps is about the best load. For the heavier Wildcat 835 gr pills, WC872 and VV 20N29 are getting more velocity with VV 20N29 having an edge in velocity spreads, I am sure because of the higher load density.</p><p></p><p>I am interested to read the tests in my next issue of VHP. I hope they include lot numbers for the tests as well to see how they compare lot to lot.</p><p></p><p>Again, good to have you here on LRH, your knowledge with the big 50s will be very valuable.</p><p></p><p>Kirby Allen(50)</p></blockquote><p></p>
[QUOTE="Fiftydriver, post: 155783, member: 10"] Scott, Good to see you on LRH!!! I tested US869 in my 510 Allen Magnum and I believe Kieth Pagel did an article for the upcoming VHP about this wildcat and also my 50 Allen Tactical as well for those not interested in an improved 50 BMG style round. I tested WC872, US869, H-50BMG and VV 20N29 in my 510 AM and found that all worked very well in this chambering which has roughly 30 grains more usible powder capacity then the standard 50 BMG. All powders worked much more consistantly with the heavy bullets then the standard 750 gr A-Max at least from a velocity consistancy stand point. You are correct that WC872 has a very high graphite content compared to other ball powders. IF you do not run it to its upper end pressure ranges, it burns very dirty. It works well in the BMG and 510 AM but again, you can not get working pressures up high enough for it to burn cleanly, well, as clean as it will burn anyway!! [img]/ubbthreads/images/graemlins/grin.gif[/img] In my testing with my lots of US869, the burn rate in the BMG was slightly faster then average for H-50BMG. I am sure there are some lot to lot variations with the new powder as there generally is. This happened when Hodgdon brought Retumbo to the market as well and now that seems to have settled down to where lot to lot variations are pretty tight with Retumbo. In my smaller bore Allen Magnums US869 often resembles a burn rate much closer to Retumbo then the slower burning powders. In the 50 cal rounds on the BMG case it seems that it has a slower burn rate personality. I have not tested it in my 50 BMG or 510 AM for temp change variation but I have in my 257 Allen Mag, 270 Allen Mag, 7mm Allen Mag and 338 Allen Mag and in every case it was nearly identical to that of WC872. WC872 also has a much more apporpriate burn rate for these chambering as well and dramatically cheaper to shoot so I have dropped US869 in favor of WC872. Do not read that as saying I do not think its a good powder. I believe it will be about the best powder there is for my new 300 Allen Xpress as early tests have proven very impressive with that round and this powder easily pushing slighly over 3200 fps with the 240 gr SMK. As far as the best powders for my 510 AM, right now for the 750 gr A-Max it looks like H-50BMG loaded to around 2770 fps is about the best load. For the heavier Wildcat 835 gr pills, WC872 and VV 20N29 are getting more velocity with VV 20N29 having an edge in velocity spreads, I am sure because of the higher load density. I am interested to read the tests in my next issue of VHP. I hope they include lot numbers for the tests as well to see how they compare lot to lot. Again, good to have you here on LRH, your knowledge with the big 50s will be very valuable. Kirby Allen(50) [/QUOTE]
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