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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
a good Long Range non barrel burn caliber
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<blockquote data-quote="AZShooter" data-source="post: 874258" data-attributes="member: 5219"><p>Scottyd,</p><p></p><p>What elevation are you using for your wind drift calculations? </p><p></p><p>I used 4000 ft on the JBM program. Just took the time to compare a which velocities will yield same wind drifts: </p><p></p><p> baseline 338RCM with 300 hybrid @ 2550 8.7" at 500 yds 10 mph crosswind</p><p></p><p> the .277 with the upcoming 195 hybrid with projected BC of .703 would need 2850 fps</p><p></p><p> 308 with 230 hybrid needs 2737 fps for same drift</p><p></p><p> 7mm with 180 hybrid needs 2935 fps for same drift</p><p></p><p>Now pondering which cartridge would move the 277, 308 and 284 diameter bullets to those velocities. </p><p></p><p>I know very little of the 270 cal cartridges and will leave that to others to consider.</p><p></p><p>The 300 WSM can do it with the 230 hybrid. I made a load for my friend's 300 WSM with RL-17 that did 2720 fps with his short barreled Browning A-bolt and it had the bullet buried! Perhaps the 300 RCM would do it too. A longer barrel would certainly help. The 308 win is a bit too small. </p><p></p><p>The 284 with a long barrel can get the 180 to 2935 fps. Doubt the 7-08 could but perhaps the 7-08 AI could. </p><p></p><p>The trend is interesting.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 874258, member: 5219"] Scottyd, What elevation are you using for your wind drift calculations? I used 4000 ft on the JBM program. Just took the time to compare a which velocities will yield same wind drifts: baseline 338RCM with 300 hybrid @ 2550 8.7" at 500 yds 10 mph crosswind the .277 with the upcoming 195 hybrid with projected BC of .703 would need 2850 fps 308 with 230 hybrid needs 2737 fps for same drift 7mm with 180 hybrid needs 2935 fps for same drift Now pondering which cartridge would move the 277, 308 and 284 diameter bullets to those velocities. I know very little of the 270 cal cartridges and will leave that to others to consider. The 300 WSM can do it with the 230 hybrid. I made a load for my friend's 300 WSM with RL-17 that did 2720 fps with his short barreled Browning A-bolt and it had the bullet buried! Perhaps the 300 RCM would do it too. A longer barrel would certainly help. The 308 win is a bit too small. The 284 with a long barrel can get the 180 to 2935 fps. Doubt the 7-08 could but perhaps the 7-08 AI could. The trend is interesting. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
a good Long Range non barrel burn caliber
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