Re: 168 Barnes lrx in a 9.5 twist?
Well, I finally got a good enough day to go out! Hit the range early (830) to avoid the inevitable wind at 10, and the heat! It was only about 80 at the range, and about 85 or so when I left. Anyway, here's the 168 LRX info
Sendero 7mm STW. New/prepped remington brass, 9 1/2M primers, retumbo. Loaded to mag length 3.650 overall
Started low because I couldn't find very much reliable info for retumbo in an STW..... first several rounds were sighting in the scope, as this combo is new to me. Rough sighted in 3 rounds!!!!!
76.5 grains-avg 2992.9 ES 23.5
77.0 grains-avg 2989 ES 14.5
77.5 grains-avg 3021.2 ES 11.4
WTF is up with the drop in velocity on the 77grain string? Consistency was okay, these three produced about 1 inch groups at 100yds. 77.5 grain string had first and third shots almost touching, and second one flew about 3/4 inch. Love the low ES, but I'm not counting on these results alot as the brass hasn't been fireformed yet. My next groupings will be 78, 78.5, 79, 79.5, 80, and 80.5. on my next days off if the wind will cooperate!
Reloadersnest shows an unverified load of 82 grains of Retumbo behind a 160 grain TSX at 3306fps. So I am kindof using that as the neighborhood of where I am hoping to be at. I'll keep an eye out for pressure signs at 80 and above.