Thread: Weathered Weatherby WSM woad devewopment

Well made it to the range today to test my initial charge weight ladder.
I got some surprising results

70.5gn: 3111fps, 3110fps, 3113fps S.D: 1.4 fps
71gn: 3137fps, 3148fps, 3135fps S.D: 7 fps
71.5gn: 3146fps, 3164fps, 3183fps S.D: 23.6 fps

The seating depth will need tweaking as the lowest S.D grouped the worst grouping

70.5gn= 1.95" 3 shot group
71gn= 0.5" 3 shot group but only 2 shots on paper as my mates dog jumped on me as I was taking the shot

71.5gn= 0.79" 3 shot group which is OK but by far the highest S.D

Notably it shoots the federal blue box 130gn factory ammo OK 1" 3 shot group at 100y.

I'm gonna do a wee seating depth ladder with the 70.5gn load see if I can't tune it to shoot tighter groups, I'm not totally unconvinced that the first group was the worst because it was the first group I shot with the rifle.
I guess the seating ladder will tell
Hoping not to burn through too many components sorting a load for this so fingers crossed

All in all I'm very happy with the velocity, it seems to shoot faster than my old Sako for the same charge weight.



70.5gn group



71gn group



71.5gn group




Also of note the scope is definitely gonna need to change, the old bushnell AR 4.5-18 is not amazing in clarity or eye relief at full magnification