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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
revolutions per minute debate
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<blockquote data-quote="Buffalobob" data-source="post: 69392" data-attributes="member: 8"><p>Now then let us shoot a 300 Wthby mag a while</p><p></p><p>We will shoot a Sierra Matchking 180 gr with a BC of 0.640 and a Sierra 180 gr round nose with aBC of 0.250</p><p></p><p>We will shoot these bullets at 3000 fps through a 1 in 8 twist barrel at 4500 revs per sec</p><p></p><p></p><p></p><p></p><p>SMk.....100yd...200yd...300yd...400yd...500yd...600yd...1000</p><p>Vel.....2826....2660....2497....2340....2188....2042....1518</p><p>R/ft....1.59....1.69.....1.80.....1.92.....2.06.....2.20.....2.94</p><p></p><p>Roundnose</p><p>Vel.....2623....2292....1986....1680....1497....1114....796</p><p>R/ft....1.71.....1.96....2.2.....2.28.....3.00....4.04.....5.56</p><p></p><p></p><p>What we see here when we hold everything constant except the BC and vary the BC the two bullets do not ever have the same RFD</p><p></p><p>Let us hope it doesn't rain tomorrow because I'm going turkey hunting come H'll or high water. you will notice that I did not commit to killing one.</p></blockquote><p></p>
[QUOTE="Buffalobob, post: 69392, member: 8"] Now then let us shoot a 300 Wthby mag a while We will shoot a Sierra Matchking 180 gr with a BC of 0.640 and a Sierra 180 gr round nose with aBC of 0.250 We will shoot these bullets at 3000 fps through a 1 in 8 twist barrel at 4500 revs per sec SMk.....100yd...200yd...300yd...400yd...500yd...600yd...1000 Vel.....2826....2660....2497....2340....2188....2042....1518 R/ft....1.59....1.69.....1.80.....1.92.....2.06.....2.20.....2.94 Roundnose Vel.....2623....2292....1986....1680....1497....1114....796 R/ft....1.71.....1.96....2.2.....2.28.....3.00....4.04.....5.56 What we see here when we hold everything constant except the BC and vary the BC the two bullets do not ever have the same RFD Let us hope it doesn't rain tomorrow because I'm going turkey hunting come H'll or high water. you will notice that I did not commit to killing one. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
revolutions per minute debate
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