Carter
Member
I currently have my 12.5 sbr zero'd for 50 yards with xm193. How much would my poi change if using 77 gr otm within 25 yards?
I prefer 50. The groups will be smaller for more precision finding the center, and for most non-magnum calibers it ends up being close to a "point blank zero" and wind errors will be smaller.Best to zero at 50 or 100- I prefer 100
Also, 25 yard zeros will lie to you. Best to zero at 50 or 100- I prefer 100.
In that case, I wouldn't even change the zero. Just fire a few supported at 15, or 25, or whatever to test for reliability in the rifle, and just see what the group does. Done.I planned to keep my zero at 50 yards with xm193 for my regular ammo. I mentioned POI difference at 25 yards because I wanted to use 77gr otm as an hd round only, and 25 yards seemed like a good reference point.
Furthest actual distance in my house is probably 15 yards.
I currently have my 12.5 sbr zero'd for 50 yards with xm193. How much would my poi change if using 77 gr otm within 25 yards?
I planned to keep my zero at 50 yards with xm193 for my regular ammo. I mentioned POI difference at 25 yards because I wanted to use 77gr otm as an hd round only, and 25 yards seemed like a good reference point.
Furthest actual distance in my house is probably 15 yards.
While it's far from ideal, I believe 77gr SMK loads actually have somewhat better terminal performance than M193 because the jackets are thin and fragment more. It was designed for accuracy and long range, but the improved terminal performance seems to be a side effect of the match jacket.For HD, why even change? OTM doesn't expand like a hollowpoint handgun bullet. The 55gr with higher velocity should do better for fragmentation/tumbling and help prevent overpenetration. If you are concerned about a criminal wearing some sort of body armor, switch to XM855. My understanding is that OTM 77gr stuff is designed for terminal performance well beyond HD ranges...
1/2" or less? Never tired it that close.I currently have my 12.5 sbr zero'd for 50 yards with xm193. How much would my poi change if using 77 gr otm within 25 yards?