I need a hand with my drop chart. I am shooting a 338 lapua savage 110 fcp hs. lapua fire formed brass, 300gr SMK, 93.6gr h1000, FGMM mag primers. I chrono these at 2780 fps at 70deg and a DA of 7000ft. the sight height is 2.075
I confirmed a good 100yd zero. I shot at a 550yd target multiple times with 7.5moa to get on target. then, 1000yd took 22.25moa the temp was 70deg and da of 7000ft measured on a kestrel 4500.
In JBM I entered the following
.338, 300smk bullet
.381 G7 BC from litz's book
1.7 bullet oal
2780fps
temp 70deg
chrono distance 10ft
sight height 2.075
zero range 100yd
zero temp 70deg
this gives me a 550yd drop of -9.7moa, and a 1000 yd drop of -24.0moa
real world is -7.5 at 550, and -22.25moa at 1000
I have played with the velocity and bc a little but cannot get the 550 and 1000 to come close to real world. Anyone see where I am screwing up?
I am using a beta master chrony for velocity and it is accurate enough to be very close. It has been checked against several other higher end units in the past and I was also shooting my .260 at the same time and it was showing the correct velocity of a proven load that I have been running all year. it is 2800 fps so it is right in the same range.
I was chooting at CRC in colorado and measured the DA and temp and only noted a 6deg rise in temp during the whole session. DA hovered right at 7000ft.
the scope is a nightforce with no known issues and has repeatable tracking. I shot several groups at both ranges as I was there to get good dope so I could work up a good chart for this upcoming weekend. I will be shooting in raton new mexico at the whittington center. The targets will be 700yd to 1800yd ish with the bonus target at over 2k. I do not have anywhere to test real world past 1000yd so I need to rely on a drop chart. Any help is appreciated. Chris
I confirmed a good 100yd zero. I shot at a 550yd target multiple times with 7.5moa to get on target. then, 1000yd took 22.25moa the temp was 70deg and da of 7000ft measured on a kestrel 4500.
In JBM I entered the following
.338, 300smk bullet
.381 G7 BC from litz's book
1.7 bullet oal
2780fps
temp 70deg
chrono distance 10ft
sight height 2.075
zero range 100yd
zero temp 70deg
this gives me a 550yd drop of -9.7moa, and a 1000 yd drop of -24.0moa
real world is -7.5 at 550, and -22.25moa at 1000
I have played with the velocity and bc a little but cannot get the 550 and 1000 to come close to real world. Anyone see where I am screwing up?
I am using a beta master chrony for velocity and it is accurate enough to be very close. It has been checked against several other higher end units in the past and I was also shooting my .260 at the same time and it was showing the correct velocity of a proven load that I have been running all year. it is 2800 fps so it is right in the same range.
I was chooting at CRC in colorado and measured the DA and temp and only noted a 6deg rise in temp during the whole session. DA hovered right at 7000ft.
the scope is a nightforce with no known issues and has repeatable tracking. I shot several groups at both ranges as I was there to get good dope so I could work up a good chart for this upcoming weekend. I will be shooting in raton new mexico at the whittington center. The targets will be 700yd to 1800yd ish with the bonus target at over 2k. I do not have anywhere to test real world past 1000yd so I need to rely on a drop chart. Any help is appreciated. Chris