Here are some of the powders that I have tried and my thoughts on how
well they responded accuracy-wise:
all data below used Fed210 primers and 140gr bullets seated into the lands.
IMR4831 - up to 47gr. pressure signs were ok but didn't show much
promise so never persued this powder any further.
IMR7828 - up to 50gr pressure was fine. Have more room to go up.
Showed good accuracy and numbers on the chrono were very good. Would
be worth a second look.
R25 - up to 54.5gr pressure was ok, accuracy was ok velocity was 3080.
Never persued this any further.
H1000 - up to 54gr. This had decent pressure. Probably has a little
more room to go up but accuracy was showing a lot of promise right in
the 53.5gr region so I never went higher. velocity was 2930fps. I went
back to this load more than once and would probably be my second
choice of powder for this chambering with 140gr bullets.
H4350 - up to 48gr pressure was getting up there but still had more
room to go if needed in case of hot weather. But the accuracy jsut
wasn't there for me even though several of the 6.5x284 shooters said
this powder worked great in their rifles. I jsut never got it to shoot
very well. But more than one 6.5x284 shooter has won with this combo
also. Just an FYI.
H4831 - up to 51.5gr velocity is right around 3000fps and this would
be considered a max load for me without drastically shortening your
case life.
50.5gr of H4831 after many years and barrels is my go to load for
140gr class bullets. this should give you right around 2925fps avg MV
and adjust your seating depth and neck tension and tweek your load
from here and I think you will be surprised. It's always worked for
me.
Also as for the case head diameter yes RWS cases measured the smallest
for me. My chamber measures .4785 (Dave keep me honest here!!) and RWS
cases measure .4765/.4766" right out of the box. Lapua and Norma
measured high .477?" out of the box. RWS has given me the longest case
life but you can't get htem any longer. Lapua was very good for case
life and Norma you have to watch the primer pockets. But I think I now
have 15 or so loading on my Norma brass and they just barely hold a
primer but they shoot and measure as well as the RWS and Lapua.
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