Originally Posted by lougonl
I have 2 long range rifles but will talk about one today. I am having problems with my ballistic solution I cannot get it to match up. I have shot my data and know what MOA is needed to hit zero and several distances but cannot get the balistic programs to match up with this data and I have tried a few programs. I will list the data I have if someone can please tell me what I am doing wrong, I am desperate. I am faily new at this.
168 Grain Berger Classic Hunter
BC G-1 .496 G7 .254
Muzzle Velocity 2553 FPS
Sight above bore 2"
Sighted in at 200 yards
Temp 65 degree's
400 5.5 MOA
500 8.75 MOA
600 14 MOA
700 20 MOA
800 27 MOA
Please help me!!!
I don't see where you mention Barometric Pressure? That will make a difference.
Things to check...
-Correct vertical alignment of your scope to your bore, I use a plum bob
-Actual scope tracking, you can check this by locking your rifle into a rifle vice at a range and checking the travel against a yard stick @ exactly 100 yds from the scope. 120 clicks (30 MOA) should equal 31.41"
-Accurate scope height.
Off the top of my head, the cause appears to be either a tracking problem or an incorrect BC or a combination of things. Your rate of ballistic decay is greater than the BC you're using suggesting the actual BC is lower. Velocity is always suspect.
In this case your actual drops vs charted drops are less @ 400 and 500, about the same @ 600 and lower @ 700 and 800.
This suggests to me that actual velocity is higher and actual BC lower than programmed.... assuming actual scope height, alignment, and tracking are correct.
Also need to know the Barometric Pressure.