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300 Grain SMK Performance
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<blockquote data-quote="jmden" data-source="post: 382380" data-attributes="member: 1742"><p>TH,</p><p> </p><p>Whats your MV on that 338 Yogi?</p><p> </p><p>In regards to the G1 BC's Sierra uses: more recent test at long ranges over a much wider velocity range has shown that the 300SMK appears to have a 'above 3k fps' G1 bc of .802. This from Bryan Litz's recent contribution to long range shooting: Applied Ballistics of Long Range Shooting. Other G1 velocity bands are as follows for the big 300g pill: 2500fps--.769, 2000fps--.742, 1500fps and below--.665. So, the 300g pill, in actual long range tests does better than Sierra's numbers until hit gets going quite slowly. This makes sense with it's tangent ogive and and meplat that is small in comparison to it's caliber than the 240. Ballistically speaking, the 300SMK is built much better than the 240SMK, not to mention it's higher sectional density. From what I've seen on this board, it also seems to enjoy more confidence in game taking ability as well. It will hit harder at much longer distances than will the 240 and that's why so many on this board use it.</p><p> </p><p>On the other hand, the 240 didn't fair as well as Sierra's typical above 3K MV G1 bc of .711. With is short, pudgy tangent ogive, that's no surprise. It just does not have a good form factor--not nearly as good as it could be. In Bryan's testing, it showed an above 3K G1 bc of .639, much lower than Sierra's published number of .711. Other G1 velocity bands are as follows: 2500fps--.644, 2000fps--.662, 1500fps and below .643. Others on this board have previously tested the 240 with, for intance two Oehler 35Ps at the muzzle and another at 300yds and came up with essentially the same numbers as Bryan did, however Bryan's testing went out to 600 yds and is as accurate as we can get short of the military's doppler radar. In fact in data that Bryan collected on bullets that he had tested and could compare to doppler data, the comparison of the two data sets was extremely close. </p><p> </p><p>If you can shoot a 240 at 3050MV or even 3100MV it will not hang with a 300SMK shot at or near 3K from a 30" barreled 338 Lap Imp pushed by 100g or Retumbo at long distance ballistically, nor will it hit as hard.</p><p> </p><p>However, with that advent here soon of the new Berger 300g line up with projected BC's for the VLD of over .9, it will be very interesting to see what happens to Sierra's lineup. Berger is also working on some 'weightier' .308's than they already have with their 210g, as you probably know. It will be very interesting to see how these perform balistically and on game.</p></blockquote><p></p>
[QUOTE="jmden, post: 382380, member: 1742"] TH, Whats your MV on that 338 Yogi? In regards to the G1 BC's Sierra uses: more recent test at long ranges over a much wider velocity range has shown that the 300SMK appears to have a 'above 3k fps' G1 bc of .802. This from Bryan Litz's recent contribution to long range shooting: Applied Ballistics of Long Range Shooting. Other G1 velocity bands are as follows for the big 300g pill: 2500fps--.769, 2000fps--.742, 1500fps and below--.665. So, the 300g pill, in actual long range tests does better than Sierra's numbers until hit gets going quite slowly. This makes sense with it's tangent ogive and and meplat that is small in comparison to it's caliber than the 240. Ballistically speaking, the 300SMK is built much better than the 240SMK, not to mention it's higher sectional density. From what I've seen on this board, it also seems to enjoy more confidence in game taking ability as well. It will hit harder at much longer distances than will the 240 and that's why so many on this board use it. On the other hand, the 240 didn't fair as well as Sierra's typical above 3K MV G1 bc of .711. With is short, pudgy tangent ogive, that's no surprise. It just does not have a good form factor--not nearly as good as it could be. In Bryan's testing, it showed an above 3K G1 bc of .639, much lower than Sierra's published number of .711. Other G1 velocity bands are as follows: 2500fps--.644, 2000fps--.662, 1500fps and below .643. Others on this board have previously tested the 240 with, for intance two Oehler 35Ps at the muzzle and another at 300yds and came up with essentially the same numbers as Bryan did, however Bryan's testing went out to 600 yds and is as accurate as we can get short of the military's doppler radar. In fact in data that Bryan collected on bullets that he had tested and could compare to doppler data, the comparison of the two data sets was extremely close. If you can shoot a 240 at 3050MV or even 3100MV it will not hang with a 300SMK shot at or near 3K from a 30" barreled 338 Lap Imp pushed by 100g or Retumbo at long distance ballistically, nor will it hit as hard. However, with that advent here soon of the new Berger 300g line up with projected BC's for the VLD of over .9, it will be very interesting to see what happens to Sierra's lineup. Berger is also working on some 'weightier' .308's than they already have with their 210g, as you probably know. It will be very interesting to see how these perform balistically and on game. [/QUOTE]
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