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Idahoans sound off.
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<blockquote data-quote="royinidaho" data-source="post: 883025" data-attributes="member: 2011"><p>I use between 93 and 99 grains of US-869 in an improved 277 cal cartridge based on the 300 RUM case.</p><p></p><p>869 is quite temperature sensitive as seems to be the case with ball powders, generally.</p><p></p><p>I'm limited to ball powders by "powder bridging".</p><p></p><p>Regardless of availability I'd shy away from 869 in the 300 RUM unless maybe you want to push a 230 offering. Otherwise you may find it too slow with lighter offerings.</p><p></p><p>869 does ok but only ok. No exceptional shooting with it. </p><p></p><p>I switch to 7828ssc and 150class bullets and she shoots much much better.</p><p></p><p>Also, with 94 grains of 869 in that big case about one out of 10 shots is a hang fire.:roll eyes:</p><p></p><p>My most recent choreographing was done at 65 degrees.</p><p></p><p>As soon as the day time temp remains in the teens I'll see just how temp sensitive it is.</p><p></p><p>The rifle maintains consistent accuracy from 93 to 95 grains thus I figure temp sensitivity will be taken care of by the ballistics calculated when I enter accurate data for fps/temp.</p><p></p><p>HTH.</p></blockquote><p></p>
[QUOTE="royinidaho, post: 883025, member: 2011"] I use between 93 and 99 grains of US-869 in an improved 277 cal cartridge based on the 300 RUM case. 869 is quite temperature sensitive as seems to be the case with ball powders, generally. I'm limited to ball powders by "powder bridging". Regardless of availability I'd shy away from 869 in the 300 RUM unless maybe you want to push a 230 offering. Otherwise you may find it too slow with lighter offerings. 869 does ok but only ok. No exceptional shooting with it. I switch to 7828ssc and 150class bullets and she shoots much much better. Also, with 94 grains of 869 in that big case about one out of 10 shots is a hang fire.:roll eyes: My most recent choreographing was done at 65 degrees. As soon as the day time temp remains in the teens I'll see just how temp sensitive it is. The rifle maintains consistent accuracy from 93 to 95 grains thus I figure temp sensitivity will be taken care of by the ballistics calculated when I enter accurate data for fps/temp. HTH. [/QUOTE]
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