I have owned and hunted deer and elk with a Ruger M77 bolt rifle in 7mm mag. I bought the rifle in the early 80's. First off, they are an excellent shooting, flat shooting, hard hitting rifle. I always shot the Winchester Super X 150 grain cartridges and they just knock critters flat. A friend also gave me some reloads and he used Nosler Bullets. I am not sure what powder. But he made them for me when I went elk hunting. The elk I shot at about 80-90 yards. The elk shuddered, took two steps and just laid down like it was going to bed down.. And never moved again. The guide was even impressed with the internal damage that Nosler did. But for all the other hunting I used the Winchester Super X and took deer out past 500 yards with the rifle.

I will not swear to it because I can not remember.. but I recollect the Nosler was a 165 grain. Does that sound right?