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Rifles, Reloading, Optics, Equipment
Reloading
Temperature sensitivity of IMR4451 ...
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<blockquote data-quote="Bobcape" data-source="post: 1864969" data-attributes="member: 13100"><p>I've been working on a project to change powders in my .260AI. I'm hooked on the chambering every since I made a wildcat in 1979 while in gunsmith school. At the time I named it .260 Bobcape. <img class="smilie smilie--emoji" loading="lazy" alt="😁" title="Beaming face with smiling eyes :grin:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f601.png" data-shortname=":grin:" /> I even corresponded with Ackley about the project. I've had 8 or 9 rifles chambered in it since. I have 3 right now. My primary one is on a blueprinted 700, etc. I shot it for 3 years in PRS. It's now on its 4 barrel. This time a Bartlein 25.5". </p><p></p><p>I have usually used RL17 to get the max velocity but obviously I have to pay the price with temperature sensitivity. H4350 and H4831SC have given slower velocities for me. Now I'm trying out both RL23 and IMR4451. IMR4451 gets me the same velocity as RL17 (within 12fps) and with SD of 6 and ES of 18. I'm liking that a lot. Has anyone tested IMR4451 for temperature sensitivity? What were your results? Thanks. </p><p></p><p>BTW - both RL23 and IMR4451 were giving poor SDs until near max charges. </p><p></p><p>My daughter ringing steel. </p><p>[ATTACH=full]184366[/ATTACH]</p><p></p><p>Current configuration. </p><p>[ATTACH=full]184367[/ATTACH]</p><p></p><p>RL23 and IMR4451 results. </p><p>[ATTACH=full]184368[/ATTACH]</p><p></p><p>Bob</p></blockquote><p></p>
[QUOTE="Bobcape, post: 1864969, member: 13100"] I’ve been working on a project to change powders in my .260AI. I’m hooked on the chambering every since I made a wildcat in 1979 while in gunsmith school. At the time I named it .260 Bobcape. 😁 I even corresponded with Ackley about the project. I’ve had 8 or 9 rifles chambered in it since. I have 3 right now. My primary one is on a blueprinted 700, etc. I shot it for 3 years in PRS. It’s now on its 4 barrel. This time a Bartlein 25.5". I have usually used RL17 to get the max velocity but obviously I have to pay the price with temperature sensitivity. H4350 and H4831SC have given slower velocities for me. Now I’m trying out both RL23 and IMR4451. IMR4451 gets me the same velocity as RL17 (within 12fps) and with SD of 6 and ES of 18. I’m liking that a lot. Has anyone tested IMR4451 for temperature sensitivity? What were your results? Thanks. BTW - both RL23 and IMR4451 were giving poor SDs until near max charges. My daughter ringing steel. [ATTACH=full]184366[/ATTACH] Current configuration. [ATTACH=full]184367[/ATTACH] RL23 and IMR4451 results. [ATTACH=full]184368[/ATTACH] Bob [/QUOTE]
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Temperature sensitivity of IMR4451 ...
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