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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
My 338 Sherman Shortmag
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<blockquote data-quote="elkaholic" data-source="post: 1467141" data-attributes="member: 13833"><p>I went out today with my long action Sherman to compare powder/velocity, etc. to the SS. Mine is a 24' barrel. I was primarily looking at the 285 ELDM but did fire a proof round with my hunting load of 65 grains H100v behind a 250 Berger. It clocked 2821, which was up about 14' from my hunting clock in at 46 degrees of 2810'. Todays temp was about 25 degrees warmer at 71, so that is about right for H100V.</p><p>I then tried 70 grains Magpro, which was all I could stuff in behind the 285. It clocked at 2582'. Pressure was low but that is all there is room for. I then shot 68 grains N560 for 2609' and 69 grains at 2644'. Both loads were under max but I think the 69 grain load was getting close. I might be able to squeeze another 1/2 grain in, but not sure? Unless Superformance or RL26 are used, it looks like N560 is king. I did get 2679 with RL26 with a compressed load and Superformance will reach a little higher but the temp instability is not worth it in my opinion, at least with the Superformance. So Doc, I think you can scratch Magpro from your SS list as it would not pressure up in that case.</p><p>[ATTACH=full]102870[/ATTACH]</p></blockquote><p></p>
[QUOTE="elkaholic, post: 1467141, member: 13833"] I went out today with my long action Sherman to compare powder/velocity, etc. to the SS. Mine is a 24' barrel. I was primarily looking at the 285 ELDM but did fire a proof round with my hunting load of 65 grains H100v behind a 250 Berger. It clocked 2821, which was up about 14' from my hunting clock in at 46 degrees of 2810'. Todays temp was about 25 degrees warmer at 71, so that is about right for H100V. I then tried 70 grains Magpro, which was all I could stuff in behind the 285. It clocked at 2582'. Pressure was low but that is all there is room for. I then shot 68 grains N560 for 2609' and 69 grains at 2644'. Both loads were under max but I think the 69 grain load was getting close. I might be able to squeeze another 1/2 grain in, but not sure? Unless Superformance or RL26 are used, it looks like N560 is king. I did get 2679 with RL26 with a compressed load and Superformance will reach a little higher but the temp instability is not worth it in my opinion, at least with the Superformance. So Doc, I think you can scratch Magpro from your SS list as it would not pressure up in that case. [ATTACH=full]102870[/ATTACH] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
My 338 Sherman Shortmag
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