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has anyone tried IMR 4166 in the 308 or 7MM-08 | ||
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One of Us |
Vines: I've done some preliminary work with 4166 in both these calibres, plus in the 22-250, 6mm Rem., and .257 Roberts. In all 5, velocities have been good, and standard deviations low, but in the 3 small bores the accuracy hasn't been near that obtained with IMR4064, Varget, or RL15, other components remaining the same. In the 7-08 (an old Browning A-bolt) I've only tested it with the 139 gr. Hornady PSP. Results were promising. Peak accuracy was at about a couple of grains less than the Hodgdon max., and accuracy and velocity were comparable to my previously established hunting load with H4350. I think further testing with other bullets lies in the future. In the 308 (a late 80s Rem. 700 BDL), I've only tested it with the 168 gr. Hornady A-max. Peak accuracy in the initial testing with WINCHESTER match brass was with the starting load, about 4 gr. below the Hodgdon max., at about 2380 fps. A second test with that accurate load compared the light WINCHESTER brass with heavier R-P brass and even heavier PMC brass. In R-P brass the load was 40 fps faster, and in PMC brass 90 fps faster. However, I got the same results as in the initial test - as velocity went up, accuracy deteriorated. I can live with the relatively low velocity, if the accuracy remains consistent, as this rifle is only used for 100 yd. Hunter Benchrest matches. However, I'll probably load up a test batch with 4166 and either Hornady or Sierra 155 gr. match bullets this coming winter to see how it performs with the lighter bullet. Hope this helps. Cheers, Al | |||
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One of Us |
thanks for that Al, your data is encouraging. I'm awaiting delivery of a 7-08 custom build from my gun smith and have a can of 4166 waiting. | |||
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