Bruce Hanson
Active Member
Ooops big fingers on small phone created post accidentally.
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What do you mean if the groups were your fault? I hope when I grow up I can shoot 200 yd groups like thoseFinally got around to jumping the Retumbo charges in my 6.5 Sherman & 156 EOL in 26" 3B.
CBTO-2.894", COAL-3.586", .020"
jump changed from 10 to 20 thou
( not sure if this was smart). New
Retumbo lot # of 16 pounds. I also moved to 200 yd, 3 shot groups. I don't know if the groups were my fault, the conditions ( wind was 3-7 mph and from 9:00 to a 12 mph head wind) or my seating depth change. Take your pick! Temperature varied from 68* to 76* over session.
I'm now going to load up 5 shot groups from 63.2 up to 64 grains and try them at 400-600 yds and see what happens.
Also, I ran a one shot pressure test in my 6.5 SS with my new 10# of N-565. Loaded 58 to 62.5 grs with 156 EOL in my 24" Bart 2b. My only pressure sign was a slight smear @ 62.5 w/temp at 80* to 84*. 61,61.5 and 62 went in same hole @ 100.
6.5 Sherman & 156 pictures below. View attachment 152069
View attachment 152074
It's one thing to have groups increase in size when you have high ES, but groups with low ES that shoot about the same...........What do you mean if the groups were your fault? I hope when I grow up I can shoot 200 yd groups like those
My final dope with 6.5 Sherman is done. 156 EOL, 63.8 gr Retumbo, CBTO - 2.904", jump .010", 26" 5R 3b, 200 yd zero @ 1575' elevation,
70*, 28.40 Hg, 50 % humidity.
My Labradar was showing 3,127 fps average, but drops @ 600 yds were calibrated to show 3,050 for my accuracy load.
One of the biggest reasons for the discrepancies for speed or bc is that fact. If more did a tall target test they would see it and then you can change your per click adj amount to make it line up. It's not always the reason but it is more common that talked aboutI had the same thing happen with my lab radar @ my 500 yd drops and finally realized it was my scope dials being off by a little
First thing I do when I mount a new scope is calibrate it. I usually measure at least 20 moa at about 50 yardsOne of the biggest reasons for the discrepancies for speed or bc is that fact. If more did a tall target test they would see it and then you can change your per click adj amount to make it line up. It's not always the reason but it is more common that talked about