The 75 A-Max explodes the PD like a V-Max, not all the time but most. If you slow them down to 2900 fps out the barrel they don't seem to do as well. But when they hit dirt at 1600 yds they throw up a dust cloud as big as the 140 JLK's, 140 SMK's and the 123 A-Max 6.5x284 rifles. I did like the way the 90's in .224 hit at 500 yds, but it takes a while longer to get there.
AT 630 yds my buddy was using 6BR 87 gr bullets, IF I timed it right I could fire just as he did and hit the PD first, yes we counted. Then we had 2 dogs on a mound at 1500 yds, he took left me the right. 1,2,3, fire, my bullet hits about 2 seconds sooner ever time, yes its the timing but also the 6BR is around 3050 fps and mine 3650 fps really makes a difference.
And a 40 gr V-Max running 48 fps in my 22-243 AI 1-9 twist, you can hit PD at 450 yds with 5-6 mph crosswind, sighted in at 400 yds, hold dead on and hit everytime, it just sends PD sideways. If you hold to outside edge of PD hit dead center. Ballistic charts say different, but we sighted in at 100 yds no wind in morning, and later three of us all did same thing at 430-485 yds. My engineer buddy is mad as hell because it doesn't work on paper. Now if I shoot same load in 1-8 twist 50% of the 40 gr V-Max's come apart at 75-225 yds yielding 2-3 impact points.
I will fire the 22-243 AI 10-25 rounds very quickly, load, get on target fire, repeat before letting barrel cool, if in hurry I pour ice water on barrel.