I wrote up a couple of replies in Big Game reloading, here's my last: BTW< this shoots flat enough for me and my deer hunting.
After combing manuals, magazines and google searches I decided not to decrease those 200 grain Sierra loads with IMR4198, I do not understand how Ken Waters got 200 fps slower with the same model rifle though.
I read on another blog shooters using 1680, Two of them claimed that the Accurate manual went to 40 grains behind the 200 grain Sierra. I went to the Accurate manual on-line and the manual did not have any loads for the 375 Win. They must of had an older manual.
I took the rifle out with 39 grains behind the 200 grain Sierra bullet. The accuracy was there - about 2 MOA at 85 yards with iron sights and old eyes.
The velocity:
2352 fps
2401 fps
2355 fps
2374 fps
2376 fps
average 2371.6 fps - if corrected for chronograph 10' ahead of bench - 2411.6 fps (If it loses 200 fps in the first 50 yard, then maybe it lost ~ 40 fps in 10 yards.)
This is a bit faster than I expected. The accuracy is there.
The drop, velocity and energy according to the Application "Shooter"
distance POI Velocity Energy
50 yards= 2.1" 2,209 fps 2,167 ft-lb
100 yards= 3.1" 2,022 fps 1,815 ft-lb
150 yards= 2.0" 1,855 fps 1,528 ft-lb
200 yards= -1.6" 1,700 fps 1,284 ft-lb
250 yards = -8.2" 1,566 fps 1,088 ft-lb
I have quite a bit of 1680 on hand for the 17 Hornet, so I will probably use this load for my 200 grain Jacketed load.
