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Rifles, Reloading, Optics, Equipment
Reloading
New to reloading. Need help asap.
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<blockquote data-quote="Mike6158" data-source="post: 573456" data-attributes="member: 1039"><p>The thing that's bugging me about the situation is going from hole in a hole at 100 yards to all over the place at 200 and beyond. I've seen my loads get worse at longer range but not that much worse. The reality is that once you get to 300 yards the number of variables that affect the group goes up exponentially. INCLUDING the shooter. I'm not saying that is the root problem but it could be "part" of the problem. For me personally, it's always a part of the problem that cannot be discounted. That said, I think that it's something else... continuing on along that train of thought... </p><p></p><p>Are you absolutely positive that your charge weights are the same? How do you determine charge weight? When I plug your numbers into the G7 program the only drop it likes at 300 yards is your initial value of 1.5. The program back calculates velocity at around 2633fps. The minimum velocity listed in the Sierra Loading Manual, for a .300 RUM and a 200gr. SMK is 2700 fps and the "green" load (accuracy and hunting) is, for most powders, 3000 fps. They list 92.0 grains of Retumbo as their 3,000 fps load.</p><p></p><p>I think your charges are lighter than what you think they are and the bullet is not stable... In fact I think you may be dangerously underloaded but I'm just one of many internet voices so take that with a grain of salt.</p></blockquote><p></p>
[QUOTE="Mike6158, post: 573456, member: 1039"] The thing that's bugging me about the situation is going from hole in a hole at 100 yards to all over the place at 200 and beyond. I've seen my loads get worse at longer range but not that much worse. The reality is that once you get to 300 yards the number of variables that affect the group goes up exponentially. INCLUDING the shooter. I'm not saying that is the root problem but it could be "part" of the problem. For me personally, it's always a part of the problem that cannot be discounted. That said, I think that it's something else... continuing on along that train of thought... Are you absolutely positive that your charge weights are the same? How do you determine charge weight? When I plug your numbers into the G7 program the only drop it likes at 300 yards is your initial value of 1.5. The program back calculates velocity at around 2633fps. The minimum velocity listed in the Sierra Loading Manual, for a .300 RUM and a 200gr. SMK is 2700 fps and the "green" load (accuracy and hunting) is, for most powders, 3000 fps. They list 92.0 grains of Retumbo as their 3,000 fps load. I think your charges are lighter than what you think they are and the bullet is not stable... In fact I think you may be dangerously underloaded but I'm just one of many internet voices so take that with a grain of salt. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
New to reloading. Need help asap.
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