Thread: Ballistic truing conundrum

SAUM 162 ELDM RL26 scope DOPE update
An update on previous posts, chasing down a difference of +1moa at 625 yards. Ballistic solvers predicted a 10moa come up, compared to my dialed come up of 9moa which gave a variance of 1-1.5in POI (low) vs POA. This set me re-checking some of the basics
1. Scope (VX6) dial up calibration. Turns out it’s dialing 1.083 in/moa, a 3% error. This equates very closely to 0.25moa at 625 yds
2. POI vs POA, checking measurements again and confirmed 1-1.5 in low at 625yd. This also equates to ~0.25 moa at 625yds. 



Correcting for 1&2 above my dial up should have been 9.25 moa and that equates to 9.5moa once you factor in the scope cal. This leaves an “error” of 0.5 moa to account for.


3. Re-check 200 yd zero, equates to 1.3in high at 100. Went to range this past weekend & put 5 shots down range. Average of 5 gave 1.5in high at 100. This equates to zero of 210 yards.

So correcting for all 3 above I still need to DOPE the muzzle velocity to get 9.5moa answer from solver. Adjusting speed to 3020fps (vs 2995fps measured) with a 210yd zero does the trick.

I also ran calcs using no adjustment for zero, just tweaking velocity (needs 3050 fps) to get 9.5 moa at 625yd. And another set just tweaking zero (needs 220 yd zero) leaving speed at 2995fps. However all 3 versions are less than 0.25 moa difference from 350 yards all the way out to 900, which is further than anything I’d attempt on game.
So I’ll proceed using 3020fps for muzzle velocity, 210 yd zero and adjusting the come up to account for scope dialing more than true moa.
Job done.