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Long Range Hunting & Shooting
20” 300 PRC
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<blockquote data-quote="SENAL" data-source="post: 1804819" data-attributes="member: 112605"><p>N570, 78.5gr, is a 60k psi load 3360ish FPS, burns 98% and fill is around 97%</p><p></p><p>You would get 120FPS slower with US869 and burn 94%. Fill is 104%. Yikes for FPS drop.</p><p></p><p>458 WSM, W748 is a big compressed load 105% fill, burns 98% 60k PSI load 2275FPS/4600ftlbs of energy out of an 18" Barrel. We can't put that sucker in the smaller ammo machines we have. We single stage it. Plus its not like that caliber is flying off the shelf. We use a little more H335 than the W748 though. We have an Africa trip on the schedule. I don't trust W748 for temp issues or sitting too long. I have heard the stories.</p><p></p><p>H335 Little less fill, slightly less speed. Same burn. If we go heavier, have to use W748 or BLC2 as H335 can't push 480gr/500gr as well. That is the fun of short barreled magnums and trying to make them live up to the long mag potential. Some we surpass. Others, super close.</p></blockquote><p></p>
[QUOTE="SENAL, post: 1804819, member: 112605"] N570, 78.5gr, is a 60k psi load 3360ish FPS, burns 98% and fill is around 97% You would get 120FPS slower with US869 and burn 94%. Fill is 104%. Yikes for FPS drop. 458 WSM, W748 is a big compressed load 105% fill, burns 98% 60k PSI load 2275FPS/4600ftlbs of energy out of an 18" Barrel. We can't put that sucker in the smaller ammo machines we have. We single stage it. Plus its not like that caliber is flying off the shelf. We use a little more H335 than the W748 though. We have an Africa trip on the schedule. I don't trust W748 for temp issues or sitting too long. I have heard the stories. H335 Little less fill, slightly less speed. Same burn. If we go heavier, have to use W748 or BLC2 as H335 can't push 480gr/500gr as well. That is the fun of short barreled magnums and trying to make them live up to the long mag potential. Some we surpass. Others, super close. [/QUOTE]
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