Quote:
ORIGINAL: goose142004
how important is the arc?
|
It depends how steep your shots could be, and how long. I shot a mule deer at 438 yds at a 15 degree angle this year.I had to reduce my elevation adjustment by about 2" at that range and angle, so not very significant. I shot an elk at 683 yards and a 15 degree angle, I think I had to reduce my elevation adjustment by 4" for that shot.
The error introduced my the angle accelerates rapidly once the angle is over 25 degrees. It also accelerates rapidly at increased ranges (but the effect of the angle is overriding).
So how important is it? If you take 500+ yd shots in areas where the angle could be 20+ degrees, then it could be very important. For example if you were hunting mtn goats or sheep it could be vital. Otherwise, not so much.
I also did not use the full offering of the ARC function. You are supposed to set it to a "rifle group" that includes your caliber --- it is NOT customized to the actual ballistics of your rifle. So the way I see it, the ARC is useless as designed because the error introduced by simplifying from accurate reflection of a specific load's performance to a whole grouping of cartidges could be much greater than the error introduced by shooting at an angle!!
I would range the animal in regular mode (actual range), then turn on the ARC rifle group mode so it would display the angle. I then had a chart that gave an accurate adjustment to make for the angle based on the performance of my specific load and rifle.