I recently developed a load for my rifle (specs below) using 2000 MR. I built a profile for the load and rifle in the Shooter app. On an 85 degree day I zeroed at 100 yards and chronoed at 10 feet at 2620 fps. I wanted to calibrate the profile so I set a target at 300 yards. The app recommended U1.3 however I needed U1.5 to have impact at POA and the calculated mv was 2540. I did the same thing on a 70 degree day at 240 yards and the app recommended U.8 however I had to adjust U 1.3 to get impact at POA. The app calculated mv using the U1.3 is 2310 fps. Temperature for the different days was between 70-85.
I use data supplied by the chrono and Shooter app for a .223 and 6.5 grendel AR's and the app recommended corrections work. I even refired some known loads and the chrono was consistent.
I will try a different chrono and try to calibrate at longer ranges. Are there other variables I should look at to get more accurate corrections?
Savage 10 PC .308 20" 5R 11.25 twist
175 SMK
46.5 2000MR
Fed 210M
LC LR brass
2.8 OAL
2620 fps at 85 degrees
Templar Tactical Ark 30 suppressor
12x SS SWFA, Harris bipod, rear bag
I use data supplied by the chrono and Shooter app for a .223 and 6.5 grendel AR's and the app recommended corrections work. I even refired some known loads and the chrono was consistent.
I will try a different chrono and try to calibrate at longer ranges. Are there other variables I should look at to get more accurate corrections?
Savage 10 PC .308 20" 5R 11.25 twist
175 SMK
46.5 2000MR
Fed 210M
LC LR brass
2.8 OAL
2620 fps at 85 degrees
Templar Tactical Ark 30 suppressor
12x SS SWFA, Harris bipod, rear bag
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