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Message: <blockquote data-quote="nemesis" data-source="post: 3581832" data-attributes="member: 12082">Lots of considerations here.  TCM is on a burn rate chart ....<a href="https://www.longrangeonly.com/forum/threads/latest-hodgdon-powder-burn-rate-chart-november-2019.7402/" target="_blank">https://www.longrangeonly.com/forum/threads/latest-hodgdon-powder-burn-rate-chart-november-2019.7402/</a>.... #53 and Alliant 2400 is #54.  2400 is a slower burning powder used for heavier loads for stout cartridges such as 357/44 magnum.  The Speer reloading manual #10 also lists 2400 as a load for 38 Special +P loads, but only for jacketed bullets. Since 2400 is right next to TCM on the burn rate chart, I would assume TCM could also be used for 38 Special +P loads.  But since there is no extant load data for that use, I would definitely contact Accurate.  However, other considerations enter in.  Secondary Explosive/Explosion Effect, for example.  <a href="http://www.sportingshooter.com.au/ask-uncle-nick/secondary-explosion-effect-a-reality" target="_blank">http://www.sportingshooter.com.au/ask-uncle-nick/secondary-explosion-effect-a-reality</a><a href="https://castboolits.gunloads.com/archive/index.php/t-265685.html" target="_blank">https://castboolits.gunloads.com/archive/index.php/t-265685.html</a>Or, we could just go old school on the whole thing.  Elmer Keith style.  He reputedly would take a powder.  Any powder.  And keep adding powder to the load until his gun blew up.  Then he'd back off 10%.  In the OP's case, if I could not cancel the order, I'd reserve the powder for a specified cartridge.</blockquote>

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