.375/300gr GSC FN
Remington brass
Federal GM215M primer
COL 3.545"
H4350 Extreme 90.0 grains
2705 fps ave vel. for 5 shots
76 degrees F
ES 22 fps for 5 shots
No group: scope was adjusted after each shot until it hit dead on POA at 50 yards with 5th shot. Zeroed in 5 shots for the Steel Maiden bullet trap.
26" barreled Remington 700 LSS shop mule.

.375/270gr GSC FN
H4350 95.0 grains
2921 fps ave. for 5 shots, ES 25 fps.
And it shoots 2 inches to the right of the 300 grainer at 50 yards.

Ah well, the Remington is just a shop mule.

With so-so results from H4350 in the factory M700, with 300 grainers, I will try IMR-7828.

I will cut it back to 2725 fps with the 300 grain GSC FN.

The 270 grain velocity is O.K. for impact testing.

Giddyup Pokie!

... However,
The Swift Bullets load manual shows that H4831 is the best powder with the 300 grain Swift bullet. 99.0 grains is the max.

The same manual shows that H4350 is the preferred powder with the 270 grain Swift bullet, and 95.0 grains is the max load.

I do love working with H4831SC Extreme, as well as the "long cut" H4831 Extreme.

The new H4350 Extreme is also a "short cut" powder, but apparently there is no long cut variety anymore, of H4350 Extreme.

Scratch the IMR-7828 unless H4831SC is not up to snuff, and I doubt that will happen.