how do you sight in your rifles,
Ive always started by finding an accurate load with a decent bullet design thats throws tight and consistent 5 shot groups, once Ive found the most accurate load, I
chronograph that load, and get the velocity out of my rifle,
i then use
a ballistic calculator
http://www.biggameinfo.com/BalCalc.aspx
too find the 100 yard zero for a trajectory that allowed the bullets max rise to reach 3.5" above the cross hairs at any point in its trajectory.
then used a target similar to the one below, so I could use the orange dot as an aim point at 100 yards and have all the slugs impact the upper green dot, the only change is that I use 3/4" dots on a 1" grid pattern, with the dots placed to match my ballistic calculators info.
example target
http://mytargets.com/target104%20grid%2 ... 20high.pdf
heres an example
0 1.2
100 2.9
150 3.4
200 2.7
250 0.6
300 -3.0
350 -8.1
400 -14.9 14
450 -23.7 20
500 -34.4
as you can see in this case any shot taken should at least in theory hit within about 3" from the aim point out to about 300 yards, and holding with the horizontal cross hair on the back line, and the vertical cross hair in line with the rear of the front leg from most broadside angles will allow lung/heart hits out to slightly over 400 yards with some judgment and experience, but use of a range finder helps, as does keeping a laminated business card with the trajectory table taped to the rifle stock
Ive always started by finding an accurate load with a decent bullet design thats throws tight and consistent 5 shot groups, once Ive found the most accurate load, I
chronograph that load, and get the velocity out of my rifle,
i then use
a ballistic calculator
http://www.biggameinfo.com/BalCalc.aspx
too find the 100 yard zero for a trajectory that allowed the bullets max rise to reach 3.5" above the cross hairs at any point in its trajectory.
then used a target similar to the one below, so I could use the orange dot as an aim point at 100 yards and have all the slugs impact the upper green dot, the only change is that I use 3/4" dots on a 1" grid pattern, with the dots placed to match my ballistic calculators info.
example target
http://mytargets.com/target104%20grid%2 ... 20high.pdf
heres an example
0 1.2
100 2.9
150 3.4
200 2.7
250 0.6
300 -3.0
350 -8.1
400 -14.9 14
450 -23.7 20
500 -34.4
as you can see in this case any shot taken should at least in theory hit within about 3" from the aim point out to about 300 yards, and holding with the horizontal cross hair on the back line, and the vertical cross hair in line with the rear of the front leg from most broadside angles will allow lung/heart hits out to slightly over 400 yards with some judgment and experience, but use of a range finder helps, as does keeping a laminated business card with the trajectory table taped to the rifle stock