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Hunting
Long Range Hunting & Shooting
Lost 100 fps after 550 rounds
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<blockquote data-quote="esshup" data-source="post: 2931028" data-attributes="member: 11101"><p>If I had to guess I'd say the difference in fps is due to the difference in powder lots. I always try to buy powder in the biggest quantity that I can of the same lot number. It seems every time I change lot numbers I need to re-visit the load to change something to get velocity or accuracy back to what it was with the first lot. I just bought H-4895, I couldn't find it in bigger than 1# containers, but all 4 containers that I got were the same lot number.</p><p></p><p>If throat erosion was the culprit, wouldn't the OP see a gradual change over time, not a huge difference from one shooting session to another? Throat erosion is also a function of how hot you get the barrel during your shooting sessions. Since I am not a target shooter where I have to get all my shots in during a certain time limit if the barrel is too hot to rest my hand on it as close to the chamber as possible, I stop shooting until the barrel cools back down.</p><p></p><p>When I bought the 7mm Allen Magnum, I bought enough powder and primers of the same lot number to last for at least 1,500 shots.</p></blockquote><p></p>
[QUOTE="esshup, post: 2931028, member: 11101"] If I had to guess I'd say the difference in fps is due to the difference in powder lots. I always try to buy powder in the biggest quantity that I can of the same lot number. It seems every time I change lot numbers I need to re-visit the load to change something to get velocity or accuracy back to what it was with the first lot. I just bought H-4895, I couldn't find it in bigger than 1# containers, but all 4 containers that I got were the same lot number. If throat erosion was the culprit, wouldn't the OP see a gradual change over time, not a huge difference from one shooting session to another? Throat erosion is also a function of how hot you get the barrel during your shooting sessions. Since I am not a target shooter where I have to get all my shots in during a certain time limit if the barrel is too hot to rest my hand on it as close to the chamber as possible, I stop shooting until the barrel cools back down. When I bought the 7mm Allen Magnum, I bought enough powder and primers of the same lot number to last for at least 1,500 shots. [/QUOTE]
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Lost 100 fps after 550 rounds
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