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Rifles, Reloading, Optics, Equipment
Reloading
6.5 Osprey Mag Photo
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<blockquote data-quote="03Rick" data-source="post: 893831" data-attributes="member: 31431"><p>When I began this project I too looked at the 7mm/300Win. Mag. and found the recoil was a bit stiff and down range terminal energy not quite the equal with large over boar cartridges and as the 6.5mm with my goal to develop a longrange cartridge for deer, sheep and antelope (not moose or elk) with moderate recoil that would deliver a minimum of 1000 ft lbs terminal energy at 1000 yds. I next looked at the 270 bullets but found that they didn't have the BC/weight I was looking for. The 6.5 mm as a hunting round has very good BC bullets readily available on the market today as well as moderate recoil and good down range terminal ability. </p><p> </p><p> As for the wind, I agree that it is a factor with all bullet types. For comparison though I site both the 6.5 123 grain and 140 gr. Hornady A-MAX as compared to the 7mm 140 grain and 168 grain Berger bullets. Using my load from a disk software ballistic results with a 26" barrel and a 10 mph 90 deg. cross wind the results are as follows:</p><p> </p><p> <strong>6.5 Osprey Mag. (2.494")</strong></p><p> </p><p> 6.5 Hornady 123 gr. A_MAX @ 3525 fps has a value of 1065 ft-lb of killing energy at 850 yds. and a wind drift of 43.4".</p><p> </p><p> 6.5 Hornady 140 gr. A-MAX @ 3325 fps has a value of 1014 ft-lb killing energy at 1000 yds. and a wind drift of 57.7" </p><p> </p><p> <strong>7mm/300 Win Mag. (2.62")</strong></p><p> </p><p> 7mm 140 gr. Burger @ 3290 fps has a value of 1014 ft-lb killing energy at 850 yds. and a wind drift of 48.4"</p><p> </p><p> 7mm 168 gr. Burger @ 2987 fps has a value of 1006 ft-lb killing energy at 1000 yds. and a wind drift of 63.1"</p><p> </p><p> So in comparison, to come close to the terminal energy of the 6.5mm 123 grain bullet requires a 140 grain bullet in the 7mm/300 Win Mag. and to compare to the 6.5mm 140 grain bullet the 7mm /300 Win Mag. has to move up to the 168 grain Burger bullet.</p><p> </p><p> Because the 6.5mm equals or exceeds that of the 7mm/300 Win Mag., I selected the 6.5mm as my longrange deer, sheep and antelope caliber.</p><p> </p><p> I hope however, that this doesn't deter you from going forward with your plans for a 7mm/300 Win. Mag. as it is a fine cartridge also.</p></blockquote><p></p>
[QUOTE="03Rick, post: 893831, member: 31431"] When I began this project I too looked at the 7mm/300Win. Mag. and found the recoil was a bit stiff and down range terminal energy not quite the equal with large over boar cartridges and as the 6.5mm with my goal to develop a longrange cartridge for deer, sheep and antelope (not moose or elk) with moderate recoil that would deliver a minimum of 1000 ft lbs terminal energy at 1000 yds. I next looked at the 270 bullets but found that they didn’t have the BC/weight I was looking for. The 6.5 mm as a hunting round has very good BC bullets readily available on the market today as well as moderate recoil and good down range terminal ability. As for the wind, I agree that it is a factor with all bullet types. For comparison though I site both the 6.5 123 grain and 140 gr. Hornady A-MAX as compared to the 7mm 140 grain and 168 grain Berger bullets. Using my load from a disk software ballistic results with a 26” barrel and a 10 mph 90 deg. cross wind the results are as follows: [B]6.5 Osprey Mag. (2.494”)[/B] [B] [/B] 6.5 Hornady 123 gr. A_MAX @ 3525 fps has a value of 1065 ft-lb of killing energy at 850 yds. and a wind drift of 43.4”. 6.5 Hornady 140 gr. A-MAX @ 3325 fps has a value of 1014 ft-lb killing energy at 1000 yds. and a wind drift of 57.7” [B]7mm/300 Win Mag. (2.62”)[/B] 7mm 140 gr. Burger @ 3290 fps has a value of 1014 ft-lb killing energy at 850 yds. and a wind drift of 48.4” 7mm 168 gr. Burger @ 2987 fps has a value of 1006 ft-lb killing energy at 1000 yds. and a wind drift of 63.1” So in comparison, to come close to the terminal energy of the 6.5mm 123 grain bullet requires a 140 grain bullet in the 7mm/300 Win Mag. and to compare to the 6.5mm 140 grain bullet the 7mm /300 Win Mag. has to move up to the 168 grain Burger bullet. Because the 6.5mm equals or exceeds that of the 7mm/300 Win Mag., I selected the 6.5mm as my longrange deer, sheep and antelope caliber. I hope however, that this doesn’t deter you from going forward with your plans for a 7mm/300 Win. Mag. as it is a fine cartridge also. [/QUOTE]
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