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Rifles, Reloading, Optics, Equipment
Reloading
H1000 old lot vs new lot.
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<blockquote data-quote="entoptics" data-source="post: 2542672" data-attributes="member: 104268"><p>Thought I would update regarding the mixing...</p><p></p><p>Shot again today, 4 Old, 4 New, and 5 Mixed. Same 61.0 grain load for all.</p><p></p><p>Old = 3036 fps</p><p>New = 2953 fps</p><p>Mixed = 2982 fps</p><p></p><p></p><p>Pretty cool huh? <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:" /></p><p></p><p>Why is that cool? I mixed 2.8 lbs of old powder with 4.8 lbs of new powder. So linear mixing model would predict...</p><p></p><p>((2.8 lbs Old x 3036 fps) + (4.8 lbs New x 2953 fps)) ÷ (7.6 lbs Total) = 2983 fps</p><p></p><p>So it appears that mixing two lots, at least for the same powder, will produce a velocity that is on a mixing line between the two. Pretty cool.</p><p></p><p><em><strong>To summarize for those aren't comfortable with forum formatted algebra</strong></em></p><p></p><p>1) Measure the velocity of the old lot, and the weight of powder you have left.</p><p>2) Do the same for the new lot.</p><p>3) Multiply Old Velocity x Old Weight</p><p>4) Multiply New Velocity x New Weight</p><p>5) Add 3 and 4 together</p><p>6) Divide that by total weight of your Mixed Lot and that should get you relatively close to the new Mixed Lot velocity.</p><p></p><p>DISCLAIMER! This seems to be valid for the same powder in good condition. It is highly unlikely, and potentially dangerous, to apply this to different types of powder. Mixing a couple of pounds of Retumbo and a few tablespoons Red Dot will almost certainly not get you some of that H4350 you've been dying to find...<img class="smilie smilie--emoji" loading="lazy" alt="😳" title="Flushed face :flushed:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f633.png" data-shortname=":flushed:" /></p></blockquote><p></p>
[QUOTE="entoptics, post: 2542672, member: 104268"] Thought I would update regarding the mixing... Shot again today, 4 Old, 4 New, and 5 Mixed. Same 61.0 grain load for all. Old = 3036 fps New = 2953 fps Mixed = 2982 fps Pretty cool huh? 😁 Why is that cool? I mixed 2.8 lbs of old powder with 4.8 lbs of new powder. So linear mixing model would predict... ((2.8 lbs Old x 3036 fps) + (4.8 lbs New x 2953 fps)) ÷ (7.6 lbs Total) = 2983 fps So it appears that mixing two lots, at least for the same powder, will produce a velocity that is on a mixing line between the two. Pretty cool. [I][B]To summarize for those aren't comfortable with forum formatted algebra[/B][/I] 1) Measure the velocity of the old lot, and the weight of powder you have left. 2) Do the same for the new lot. 3) Multiply Old Velocity x Old Weight 4) Multiply New Velocity x New Weight 5) Add 3 and 4 together 6) Divide that by total weight of your Mixed Lot and that should get you relatively close to the new Mixed Lot velocity. DISCLAIMER! This seems to be valid for the same powder in good condition. It is highly unlikely, and potentially dangerous, to apply this to different types of powder. Mixing a couple of pounds of Retumbo and a few tablespoons Red Dot will almost certainly not get you some of that H4350 you've been dying to find...😳 [/QUOTE]
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H1000 old lot vs new lot.
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