I FINALLY got around to doing some long range testing with my Omega and its favorite load, a 200 gr Shockwave over 110gr of FFg 777. This load goes 2115 over the chrono.
I shot at 200, 300, and 400 yards. I have a Leatherwood range-compensating scope on the gun, which I calibrated to compensate for trajectory at 200 and 300 yards. It's supposed to be set from 100-300 yards, but this load shoots too flat to worry about compensating over that range so I was trying to set it from 200-400 instead.
Groups were pretty good. 200 yards averages around 1.75-2". 300 yard groups opened horizontally a bit with the 5-10mph crosswind, going 2.5-5" with the larger groups being obvious horizontal spread (wind drift 6" off center at 300 yards on average).
400 yards was an interesting experiment. First I found that the cam on the scope had problems compensating for the quick drop-off after 300 yards; set to compensate perfectly at 200 and 300 yards, the groups centered about 10" low at 400 yards. Vertical spread of the groups was excellent, only about 3.75" and I'm sure some of that was my less-than-ideal shooting setup. Horizontal spread suffered a lot in the changing wind, averaging about 7-8". The group drifted an additional 16-20" wind drift going from 300 to 400 yards.
While this was a fun target exercise and I'm sure I'll go for 500 yards next spring, it brings up some good points. Even forgetting energy for the moment, even a flat-shooting ML setup such as this becomes very iffy at these ranges for harvesting game. The bullets available today simply do not fly flat enough or resist wind drift enough to make a clean kill reliably. Sure, given a calm wind it wouldn't be a problem, but that is rarely the case in the field around here.
For kicks (bad pun) I chronoed 135gr of 777 with this bullet to see if I could replicate the impressive velocities I have seen reported. I came up with 2215 fps average (range 2205-2220, n=5). This is about in line with what I expected at what I consider the max I would ever shoot from the gun.