Well finally I finished my test and here is what happened. I started working on loads last night around 10:00PM til early in the morning and setting up my rifle taking off the Zeiss and putting on my new Leupold and bore sighting til early in the morning. Went to bed and got a few hours sleep them went to the range today and accomplished the following. Using MRP and RL-22 which were the final powders to test against each other since they both earlier this week produce good velocities and accuracy. My Mark V 416 Weatherby Magnum with Accubrake and its best group came when I was - Using 120grs RL-22. I had no max signs and base of brass expansion after fired measured less than .0004 and there were no shinny marks on bottom of the brass and no flattened primers. Please do not use my load unless you work up to it because I have a cool lot of RL-22 and your lot could be as much as 10% hotter than mine. My average velocity is 2930fps, shooting .625" at 100yds. The 350gr TSX is outstanding. My OAL was 3.750" I have put a Leupold VX III 2.5-8x36mm with Wide Duplex for acquiring my target faster and it really is a nice scope with sharp picture and tracked well even after the recoil of the 416. Here are my load ballistics.
Muzzle 2930fps - eng. 6671 pounds
2750fps +3 1/2" 100yds - eng. 5876 pounds
2577fps +4.04" 200yds - eng. 5161 pounds
2410fps - .73" 300yds - eng. 4516 pounds
2250fps -11.5" 400yds - eng. 3935 pounds
2096fps -29.3" 500yds - eng. 3414 pounds
1948fps -54.6" 600yds - eng. 2950 pounds
I can hit out to about 370 then hold cross hair on top of shoulder and hit out to 430 to 450 on deer and elk size game and a little further on moose. Will work real well on big bear. Now this does not mean I will get the chance to make a long shot, nor take one unless I am sure of my shot and will not take a real long shot on dangerous game. I will practice at long range to get use to it and make sure that my ballistic calculations are close to right . But this will be devastating up close or far off. What ever it hits it will be dead. This 416WBY completes my trio of Weatherbys. I have a 257WBY, a 300WBY and now the 416WBY. The 257WBY I named "Nancy Jean" (my wife), because the 257WBY does not hit me back when I pull the trigger and it has fine lines and shoots straight. I named the 300WBY "Thors Hammer" because of the 180gr TSX that moves out at 3287fps and hits with authority. I named the 416WBY "Odin", Odin was the father of Thor in viking myth and Odin was brave and would face the enemy up close and not run, delivering a deadly blow. I am really excited about this load and its potential. This has truly been fun. The Accubrake made the 416 feel like a 300WBY that has no brake. It was easy to shoot and reload for.