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Long Range Hunting & Shooting
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<blockquote data-quote="Capt RB" data-source="post: 1540448" data-attributes="member: 85987"><p>Dave Tooley is running 2825 with the 212's with 72. something of h4831 I couldn't find his barrel length but I believe he said that it as a 22-24" 9tw tube he took to Africa last spring. Factory 225 ammo has been running over the 2850 which is 75.2+- of H1000. That was also out of a 24" test barrel. The 230smk has less barring surface than the 212. If that 230 follows the other 27 caliber ogive bullets you should see 50-70fps more speed than similar weight projectiles at the same pressure. I have shot the 6.5/150's and the 7mm 183's so far. same charge weight with the same rifle; 6.5 147's 2830. 6.5 150's 2895 but wouldn't stabilize at my conditions 10 degrees 15' above sealevel baro 30.03</p><p>7mm 180 smk(.66bc) 2845fps 183 2919fps 29 degrees 15'above sealevel 30.32 baro. The 183's in the 9.125tw won't group well enough to switch to them in my conditions I normally shoot in. An 8.5 or more twist is needed for my typical negative DA # of -2200 for chance to switch. Knowing this I have an 8tw 30 cal and 8tw 7(actually a gain tw 8.35 to 8) on order. If you can convince your smith to put a tapered lap into your barrel you can see up 125fps gains over typical speeds. just make sure your tapering it the right direction. And before you say well so and so would know this. You pay for it in shorter barrel life which most also know about</p></blockquote><p></p>
[QUOTE="Capt RB, post: 1540448, member: 85987"] Dave Tooley is running 2825 with the 212's with 72. something of h4831 I couldn't find his barrel length but I believe he said that it as a 22-24" 9tw tube he took to Africa last spring. Factory 225 ammo has been running over the 2850 which is 75.2+- of H1000. That was also out of a 24" test barrel. The 230smk has less barring surface than the 212. If that 230 follows the other 27 caliber ogive bullets you should see 50-70fps more speed than similar weight projectiles at the same pressure. I have shot the 6.5/150's and the 7mm 183's so far. same charge weight with the same rifle; 6.5 147's 2830. 6.5 150's 2895 but wouldn't stabilize at my conditions 10 degrees 15' above sealevel baro 30.03 7mm 180 smk(.66bc) 2845fps 183 2919fps 29 degrees 15'above sealevel 30.32 baro. The 183's in the 9.125tw won't group well enough to switch to them in my conditions I normally shoot in. An 8.5 or more twist is needed for my typical negative DA # of -2200 for chance to switch. Knowing this I have an 8tw 30 cal and 8tw 7(actually a gain tw 8.35 to 8) on order. If you can convince your smith to put a tapered lap into your barrel you can see up 125fps gains over typical speeds. just make sure your tapering it the right direction. And before you say well so and so would know this. You pay for it in shorter barrel life which most also know about [/QUOTE]
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