Most of my lightweight loads for .308 Win. and 30-06 class rifles use cast bullets and 25.0 gr. of either IMR of H4895. My wife wanted a light load to practice with her Ruger M77 RSI in .308 but that rifle is extremely fussy about ammo and won't shoot cast bullets accurately at all. I tried an experiment using the 25.0 gr/4895 load with some 150 gr. Winchester Power Point bullets I had on hand and they worked reasonably well for her. If I were to try that with a 30-06 level cardtidge, I think I'd go 2.0 full grains higher.
Paul B.
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