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Rifles, Reloading, Optics, Equipment
Reloading
IMR-7828
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<blockquote data-quote="brianwinzor" data-source="post: 96451" data-attributes="member: 1067"><p>Dakor, Since about 1986, I have tested IMR7828 in a numerous rifles and bullet weights, and found that although in many instances it delivers the highest velocity, it also is a bit unpredictable and spikey with pressures. It is for that reason that I have never used it in a field load in one of my rifles.</p><p></p><p>I have also read numerous reports that Ramshot Magnum is temp stable, but it appears from data I have seen to be 2 - 3 grains slower burning than Re22. However, I have not tested the powder, as it has not been imported into Australia.</p><p></p><p>I have found that my current tins of IMR 7828 which were purchased between 1986 and 1990, seem a tad faster burning than data from some other users. </p><p></p><p>I have found that Re 22, IMR 7828, Viht N560, Viht N165, Win WXR, AR 2213sc(H4831sc), and the long discontinued W785 all seem to produce Max pressure with load variation of 0.5 to 1.0 grains. As an example, I have listed below velocities obtained at about max pressure with most of above powders with the 69 grain Sierra HPBT in a 22/250AI on 25/08/2003. (Temp 14C, Rem Cases, Rem 91/2M primer:</p><p>43.5 Win WXR - 3439 fps</p><p>44.0 Win 785 - 3359 fps</p><p>44.0 Vith N165- 3378 fps (Near Max)</p><p>44.0 AR 2213sc- 3264 fps</p><p>43.5 Viht N560 - 3326 fps</p><p>44.0 Re 22 - 3416 fps</p><p>46.0 Win WMR - 3402 fps</p><p></p><p>At this stage I cannot recommend a powder that would be temp stable to replace Re 22. H4831sc (AR 2213sc in Oz) is supposed to be temp stable, but the velocities it has produced in many of my tests have been disappointing. Maybe I have had "dodgy" tins. Hope the above helps, Brian.</p></blockquote><p></p>
[QUOTE="brianwinzor, post: 96451, member: 1067"] Dakor, Since about 1986, I have tested IMR7828 in a numerous rifles and bullet weights, and found that although in many instances it delivers the highest velocity, it also is a bit unpredictable and spikey with pressures. It is for that reason that I have never used it in a field load in one of my rifles. I have also read numerous reports that Ramshot Magnum is temp stable, but it appears from data I have seen to be 2 - 3 grains slower burning than Re22. However, I have not tested the powder, as it has not been imported into Australia. I have found that my current tins of IMR 7828 which were purchased between 1986 and 1990, seem a tad faster burning than data from some other users. I have found that Re 22, IMR 7828, Viht N560, Viht N165, Win WXR, AR 2213sc(H4831sc), and the long discontinued W785 all seem to produce Max pressure with load variation of 0.5 to 1.0 grains. As an example, I have listed below velocities obtained at about max pressure with most of above powders with the 69 grain Sierra HPBT in a 22/250AI on 25/08/2003. (Temp 14C, Rem Cases, Rem 91/2M primer: 43.5 Win WXR - 3439 fps 44.0 Win 785 - 3359 fps 44.0 Vith N165- 3378 fps (Near Max) 44.0 AR 2213sc- 3264 fps 43.5 Viht N560 - 3326 fps 44.0 Re 22 - 3416 fps 46.0 Win WMR - 3402 fps At this stage I cannot recommend a powder that would be temp stable to replace Re 22. H4831sc (AR 2213sc in Oz) is supposed to be temp stable, but the velocities it has produced in many of my tests have been disappointing. Maybe I have had "dodgy" tins. Hope the above helps, Brian. [/QUOTE]
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