As you may remember, I bought an AR variant called a KelTec SU16-C to protect MM from Contract Killer Vengeful Chipmunk Organized Wave Attacks while we were considering a trip to the unknown Virginia side of the Blue Ridge.
The trip never came off, but the rifle did.
Once the bulk brass buying was done, the cases were sorted and tumbled, sized and trimmed and the primer pockets were all reamed. Then the cases then got reloaded in 3 different bullet weights and two major load levels (mean and wimpy) so I could share some ammo with MM without "springing" up on his Thompson Centers at their hinge area/lockup weak point.
Hurricane interruptions and wife eye surgeries intervened, but I finally pulled it all together and the range time finally came due today.
First thing I noticed is that the various bullet types and weights all shoot to the same group at 50 yards through the 4x Ruger scope (in a roundish 2" x 2" group that included some fast firing and some slow squeezing).
This zero point was chosen as it puts the gun about an inch high at 100 yards and back to zero at 200 yards. Why 200 yards? I got two hunting bullets that are constructed and meant for big game and it is legal to hunt with the gun in NC if I put a 5 round block into the short 10 round magazine.
Same rounds will go into 30 round mags for SHTF duty, and will do just fine at short and longer ranges.
Gun carries a 4x Ruger fixed scope for daytime long range shooting, a no magnification reflex red dot sight for moving targets and a laser for inside the house when you need to know where the bullet is going to hit with some "easy to use for terrified people" short range precision.
Follow the logic.
Step #1, get the 4x main scope dialed to be spot on at 50 yards (5.56 ballistics then says you are gonna be 1" high at 100 yards and spot on again at 200 yards).
Step #2, use the scope crosshair position to zero the red dot reflex sight. (Hey, the reflex isn't nearly as refined as the 4x fixed scope's definition, but as long as it, the 4x fixed scope and the laser all are taught to agree at the various relevant distances you are good to go.) Do this same trick with the laser sight.
Step #3, checking back at 25 and 50 yards by shooting each kind of rounds found the system works within an inch of parallax error (red dot and laser are both offset a bit vs the 4x scope and the bore axis).
So, I am pleased with the rifle and the 3 sight system set up, as I am now good for day vs night and for close vs far with the 3 sight systems that are on the gun (systems my old eyes can actually use).