Re: 7mm RM and loads using 175 SMKs
Craigp40, I owned a Rem 700 classic in 7mmRM in the mid 80's, so naturally I didn't have the opportunity to use the Sierra 175 MK. However, I did chronograph and test the 175 Sierra GameKing, as well as the 120 & 140 Nosler BT's.
Judging from my results, I am sure that Re 25 will be not be too slowburning for use with the 175 grain bullet.
Using Remington cases, I found that to fill the case to the base of the neck, it took about 76.0 grains of a long cut extruded powder such as IMR 7828, and 83.5 grains of ball powder such as H870. I estimate that a short cut extruded powder such as Re 25 would have occupied about 78 - 79 grains. My chrono results with the 175 MK,Rem cases, Fed 215 primer, were:
65.0 grains IMR 7828 - 2740 fps
66.0 grains IMR 7828 - 2808 "
67.0 grains IMR 7828 - 2883 " (Max)
76.0 grains H870 - 2841 fps
77.0 grains H870 - 2901 fps
78.0 grains H870 - 2977 fps (Max)
Generally most people tend to use the 140/150 grain bullets for medium game, and use the 175 grain bullets for larger game. I have not heard how the 175 grain MK performs in the field. Regards,Brian.