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imr 7977 for 270 win

05 Jul 2018
@ 11:40 am (GMT)

Thomas Kitchen

hi guys
stumbled across data for newer powder for 270 win.
it looks good, im slowly working my way through some imr 4831 and 150gr sst so it'll be a while before i can try it.
stats look good might work well with 145gr eld-x to.
good to see some good quick data for the poor neglected 270win

Case: Winchester
Twist: 1:10"
Primer: Winchester LR, Large Rifle
Barrel Length: 24"
Trim Length: 2.530"
Email Data
Print Data
BULLET WEIGHT
150 GR. HDY SP
MANUFACTURER
IMRPOWDER
IMR 7977BULLET DIAM.
.277"C.O.L.
3.285"

STARTING LOADS
GRS. VEL.(FT/S) PRESS.
56.5 2,717 50,600 PSI

MAXIMUM LOADS
GRS. VEL.(FT/S) PRESS.
60.8C 2940 61,300 PSI

Replies

06 Jul 2018
@ 07:04 am (GMT)

Quote this

Nathan Foster

Re: imr 7977 for 270 win

Looks like good velocities but quite a hefty charge to get there and this will be computer generated theory. It may require another 4 grains to achieve the quoted speed and it may be two steps (burn rate) too fast for the 22" barrels. Time will tell.