There is a single chart showing the M193 and M855 both zero'd at 100 yards. You have less than 1/2 inch in trajectory difference out to 250 yards.
From that you can deduce that if you have sighted in with M193 at 100 yards, the change in POI with the M855 would be negligible and lost in normal group dispersion.
Negative. The trajectory may be similar, however POI between them is probably not. Every single gun will be different. You can not assume that different loads will shoot to the same point of impact. As I said before, between personal and Mil issued M4/AR15's only about half have same POI for both M855 and M193. I have a brand new SOPMOD M4A1 that has a 4MOA shift at 100m between M855 and M193. I also had an SPR that had identical POI for MK262, M855, and M193.
Yes if both are zeroed for 100 meters than the trajectory will be close. However just because you zeroed M193 does not mean that M855 will be zeroed. You have to check it.
