i started load development for my wife 260 rem model 7 this morning.
i use remington once fired brass
cci br 2 primers
nosler 120 gr. ballistic tips
and h4350 powder
coal is 2.780"
i tried the newberry method for the first time. as far as grouping goes
i'm satified, for a first attempt.
here's the target.
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group number three has a flier, probably my error, i just don't know.
so here's the chrono i got on those
group 1 is 44.8 grains vel. was 2744,2789,2005???
group 2 is 45.2 grains vel. was 2803,1969,1766
group 3 is 45.6 grains vel. was 2772,2002,2650
group 4 is 46.0 grains vel. was 1999,2063,2715
group 5 is 46.4 grains vel. was 2054,2867,2825.
i also shot 3, 3 shot group with my 308 and factory loads, and all were around 2700 fps.
so what do you long time reloaders think?
i never experienced something like this with this chrono so far.
after the first few odd readings i relocated the setup somewhere else
to make sure the sun angle wasn't playing tricks on the chrono.( prochrono pal)
all the loads were carefully weighted on a beam scale.
scale was zeroed before and checked after loading session.
all the shot felt the same (recoil and muzzle blast).
should i use magnum primers with this powder?
is it possible that it's the load?
would i get groups like that at 100 yard with some bullets going 800 fps slower?
i'm a bit lost right now.
thank's for your help.