Thanks a friend of mine for using his software and helping me decide on powder for the 180gr TSX in my 300WBY Mag. Just look at the results, the very powder he said would work did just as his soft ware predicted.
The next two pictures are the 180gr TSX , RL-22 moving at 3287fps, three shot group at 100yds and the group size is .334”
This third picture is 180gr TSX , IMR7828 moving at 3211fps, three shot group at 100yds and the group size is .452”
Bullet: 180gr TSX
Powders used: H4831, IMR7828, MRP, RL-22, RL-25
Primer used CCI 250 Large Rifle Mag.
Brass used: New, unprimed Weatherby brass.
OAL was: 3.710”
Please work up to any loads I have used although safe in my rifle might not be in yours. I used unprimed New Weatherby brass and not neck sized once fired brass because I wanted accuracy with full sized new brass so that each round would feed easy because of some of the game I will be hunting. Did not have a group over 1 ½” group with the TSX no matter what power or charge I used. With H4831 it took 85grs to reach just over 3200fps and accuracy was the worst of the bunch which 1 ½” is not bad. RL-25 gave good velocity over 3200fps but not accuracy I wanted it was over 1” also. Now MRP was over 3200fps but was also over 1” in group size. IMR7828 was 3211fps and shot a .452” group. The real surprise was RL-22 with 84.5 not so much in velocity which was 3287 but in accuracy, a .334” group. WOW!!!! What a load, Yep this will be my load at this velocity and accuracy even for the big ones. What a day at the range. It all happened so quick without a bunch of trouble, not a single problem of any kind. Thank you Lord! Now I don’t have to spend a ton of money and a lot of time tweaking powder or OAL. By the way it was 85degrees at the hottest point this morning and no pressure signs with the two loads shown in the pictures. I measured the base, and no real flat primers or shiny marks on the bottom of the brass. Thanks to my friend ☺☺