quote:

Originally posted by slancey:

Anybody ever use this sight-in? I don't remember using a zero further than 200.

quote:

Originally posted by Roll-Crimp:
Slancey, when these calculations are performed the size of the target is factored in to provide point blank ranging. It cannot be smaller than the scope centerline to the bore centerline distance, but it can be any size larger. You decide the target size you want the bullet to strike within and the trajectory calculator will determine how far out you can shoot with your sight on dead center and hit within that defined target area. Example: for a deer, you might enter 5" as your PBR target size. An elk might with be large, say 6.5" and would give you a PBR farther out due to the vertical spacing being higher. For a PD, you'll want to stay under 3" and ground squirrel, even less. The advantage is the ability to quickly engage your target if you know it is w/in the PBR distance for your rifle & round w/out cyphering drop ballistics. Your reloading manual uses 2.5" scope height as a generally used distance on hunting rifles. For running vermin the advantage is you only need to focus on windage & lead, and really, all you got to do is tag part of it to slow it down before finishing it off. Broadside, a fox or yote as a target is much more forgiving target on the horizontal axis (windage) because of the dog's length. The elevation axis is smaller, so using PBR can be a big advantage. PBR works w/ open sights too, and being mounted right on the barrel can PBR very small targets.

The JBM (eskimo) site has a useful ballistic tool that should help you become more familiar with the ballistic track of your rifles JBM Small Arms Ballistic Calculator

quote:

Originally posted by rcamuglia:

quote:

Originally posted by Roll-Crimp:
Slancey, when these calculations are performed the size of the target is factored in to provide point blank ranging. It cannot be smaller than the scope centerline to the bore centerline distance, but it can be any size larger. You decide the target size you want the bullet to strike within and the trajectory calculator will determine how far out you can shoot with your sight on dead center and hit within that defined target area. Example: for a deer, you might enter 5" as your PBR target size. An elk might with be large, say 6.5" and would give you a PBR farther out due to the vertical spacing being higher. For a PD, you'll want to stay under 3" and ground squirrel, even less. The advantage is the ability to quickly engage your target if you know it is w/in the PBR distance for your rifle & round w/out cyphering drop ballistics. Your reloading manual uses 2.5" scope height as a generally used distance on hunting rifles. For running vermin the advantage is you only need to focus on windage & lead, and really, all you got to do is tag part of it to slow it down before finishing it off. Broadside, a fox or yote as a target is much more forgiving target on the horizontal axis (windage) because of the dog's length. The elevation axis is smaller, so using PBR can be a big advantage. PBR works w/ open sights too, and being mounted right on the barrel can PBR very small targets.

The JBM (eskimo) site has a useful ballistic tool that should help you become more familiar with the ballistic track of your rifles JBM Small Arms Ballistic Calculator

Shame on you Roll-Crimp! Suggesting one might need 2 shots to dispatch a varmint!

quote:

Originally posted by groundhog devastation:
"Know thy rifle well" GHD

quote:

Originally posted by Roll-Crimp:
Slancey, when these calculations are performed the size of the target is factored in to provide point blank ranging. It cannot be smaller than the scope centerline to the bore centerline distance, but it can be any size larger.

quote:

Originally posted by slancey:
I have sighted in for the max PBR, and I was afraid of shooting over too many shorter range dogs. But I'm going to try anyway and see if I can't get the hang of it in the field.