Today, I spent the morning at the Manatee Range, testing my R8 Professional Success with the 20.5" Semis Weight Fluted barrel, together with the Zeiss 9-12X56 HT rail mounted scope with ASV turret.
I chose to use the load that has proven most accurate in this barrel and has reasonable down range ballistics, the Nosler 250 grain Accubond seated to the channeler in Lapua brass, charged with 58.0 grains of IMR4895 and lit by a Federal 215M primer. This load shoots mostly one hole groups at 100 yards and has been calibrated with this scope to print dead on at 100 yards.
According to the JBM ballistic calculator with today's atmospheric conditions loaded in and the measured muzzle velocity of 2,405 FPS the drop should be 30 clicks with the Zeiss 1.3 MOA or 1cm/100m click increments which would call for the #007 turret ring. I know from past experience that this bullet performs better, shoots flatter than the published BC so I chose to use the #006 turret ring which uses 27 clicks instead or 30 for the 400 yard range.
Without this testing, or if I had just used the JBM calculator without field verificagtion it could result in wounded game, and nobody wants that to happen. Field verification is essential to taking game cleanly and ethically at extended range.
Since I had recently sighted in at 100 yards and verified the zero as dead on multiple times I dispensed with 100 yards and began at the 200 yard line with the turret set for 200 yards or 6 clicks up. Three shots printed about .75 MOA landing high and right as you can see in the below picture.
I could understand the horizontal movement to the right. There was a 10=15 MPH wind blowing from the 11:00 position, that is what I would expect for movement of the group to the right.
Next was the 300 yard line with the scope set at 300 yards or 11 clicks up. Again the group was high and right and about 3/4 MOA horizontal but less than 1/2 MOA vertical dispersion. This is what I would expect as the winds were variable and playing havoc with everyone on the line. The left most shot was called as the wind let up just as the shot broke. You can see in the below picture that the vertical error continues to grow.
Next I moved to the 400 yard range and fired another three shot group. This group was even more impressive and was less than 1/2 MOA but continued the trend of vertical error.
Luckily, the bench set up I had was sufficiently solid to allow me to keep the gun in place while adjusting the turret. It was clear that the 400 yard correction was only 24 clicks so the #005 turret ring would put it dead on at 400 yards and that doping the wind would center the group.
With this range session, and the correct turret ring #005, I'm relatively certain that this combination of load, gun and optics, the 9.3X62 is truly a 400 yard gun from a solid rest. I'm happy with that performance.
How far away was he when you shot him?
Dang, hell of a story there. I would think that just pulling their arms off would do the job. 
