How accurate is Exbal for calculating velocity?
I've worked up a load with 162 A-Max and 65.5 gr H1000 with my 7 SAUM. My zero is 300 yds and I shot the load at 600 yds yesterday and the estimated 2950 fps was way off. All impacts were at least 12" above my target. I adjusted the velocity to 3243 fps for this morning. I shot at 660 yds today and Exbal called for 7.5 MOA elevation. The group was still 4.5" high and Exbal calculated the velocity at 3371 fps. I'm finding to very hard to believe this calculation to be correct. I'm going to shoot at 900+ on the next good morning and see what my drop is using the 3371 calculation.
Has anyone else had this "problem" with their load? Should I adjust the BC to match my drops or go with what Exbal calculates?
ACTIVE DUTY MARINE CORPS '96-'04
SERGEANT (MED RET)
COMBAT ENGINEER, MOUT INSTRUCTOR, RIFLE/PISTOL INSTRUCTOR
"Be polite, be professional, but have a plan to kill everyone you meet."
"I come in peace. I didn't bring artillery. But I'm pleading with you, tears in my eyes: If you f*ck with me, I'll kill you all." Marine General Mattis
Custom built 7mm SAUM