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Rifles, Reloading, Optics, Equipment
Reloading
Thoughts on mixing powder lots?
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<blockquote data-quote="J E Custom" data-source="post: 1259307" data-attributes="member: 2736"><p>In a perfect world, Blending would be ok but this is not a perfect world and different lots/batches of powder are sometimes not the same so the problem is getting a perfect mixture of different powders without damaging the powder. There was a post a long time ago about tumbling loaded rounds to clean up the brass. that also had a downside and that was because It damaged the coating and altered the burn rate. (Coatings are to aid in consistent burn rates and minimize heat sensitivity). so damage to this coating can/will change the burn characteristics.</p><p></p><p>When I switch to a new lot/batch of powder I test over a chronograph against the older lot so I know exactly what the change if any is in both SDs and velocity And can adjust if I have to. (Some times I see no difference, but some times I do). with blended powders I found an occasional flier with different velocity and SDs than the rest and had no real explanation for what happened. now when I do get a flier it is much closer to the same velocity and the SD change is very slight. So by not blending I have eliminated one more possibility and look at my loading process to see if I may not have done as good as I can.</p><p>I use to be thrilled with SDs in the teens, now I consistently get below 10 ft/sec and most of the time if I do my part, below 5 ft/sec. I would like to reach zero but I am not sure that is possible with so many variables in re loading, But I try.</p><p></p><p>For me, this has been the best way to manage the difference with large quantity powder charges.</p><p>my 50 bmg took 250+ grains and a 1# can didn't last long but I had no problems with adjusting to new lots of powder (Normally less that 5 rounds of the new, and 3 rounds of the old).</p><p></p><p>Hey its ok if anyone wants to blend there powders, I just choose not to because of the reasons posted.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1259307, member: 2736"] In a perfect world, Blending would be ok but this is not a perfect world and different lots/batches of powder are sometimes not the same so the problem is getting a perfect mixture of different powders without damaging the powder. There was a post a long time ago about tumbling loaded rounds to clean up the brass. that also had a downside and that was because It damaged the coating and altered the burn rate. (Coatings are to aid in consistent burn rates and minimize heat sensitivity). so damage to this coating can/will change the burn characteristics. When I switch to a new lot/batch of powder I test over a chronograph against the older lot so I know exactly what the change if any is in both SDs and velocity And can adjust if I have to. (Some times I see no difference, but some times I do). with blended powders I found an occasional flier with different velocity and SDs than the rest and had no real explanation for what happened. now when I do get a flier it is much closer to the same velocity and the SD change is very slight. So by not blending I have eliminated one more possibility and look at my loading process to see if I may not have done as good as I can. I use to be thrilled with SDs in the teens, now I consistently get below 10 ft/sec and most of the time if I do my part, below 5 ft/sec. I would like to reach zero but I am not sure that is possible with so many variables in re loading, But I try. For me, this has been the best way to manage the difference with large quantity powder charges. my 50 bmg took 250+ grains and a 1# can didn't last long but I had no problems with adjusting to new lots of powder (Normally less that 5 rounds of the new, and 3 rounds of the old). Hey its ok if anyone wants to blend there powders, I just choose not to because of the reasons posted. J E CUSTOM [/QUOTE]
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Thoughts on mixing powder lots?
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