Dennis_in_VA
Well-Known Member
My Sierra Infinity software shows the B.C. for this bullet to be .768 for velocities 2300 and up. Is this correct for 338 EDGE velocities?
338 / 300 GR B.C.??
- Thread starter Dennis_in_VA
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Black Diamond 408
Well-Known Member
Dennis,
It could be higher than that if you get your velocity up around 3000fps. My 338 snipe-tac at 3320fps is showing a BC right at .800 I can run the loads over 3400fps but the drop don't change too much.
Dave
It could be higher than that if you get your velocity up around 3000fps. My 338 snipe-tac at 3320fps is showing a BC right at .800 I can run the loads over 3400fps but the drop don't change too much.
Dave
Dennis_in_VA
Well-Known Member
you will have to overlook my ignorance, but how would I determine if that B.C. of .768 is correct for let's say a MV of 2900 - 2950?
royinidaho
Well-Known Member
Method 1) Use two calibrated chronos. 1 @ 10 feet the other at 200 or 300 yds. Then plug the data including all atmospheric data into an external ballistics program and vary the BC to make the velocities fit the actual.
Method 2) 1 Chrono for MV. Then zero @ 100 and shoot at 200, 300, 400, 500 and 600 yds to measure drop at each distance. Record all atmospheric data.
Then vary the BC input to the ballistics program unti it fits.
Things get fairly confusing but you'll get close.
The published BC for the 300 smk works pretty well up here at 4450' MSL. Down where you are it will probably be a bit lower. Maybe lower 7s or high 6s.
Method 2) 1 Chrono for MV. Then zero @ 100 and shoot at 200, 300, 400, 500 and 600 yds to measure drop at each distance. Record all atmospheric data.
Then vary the BC input to the ballistics program unti it fits.
Things get fairly confusing but you'll get close.
The published BC for the 300 smk works pretty well up here at 4450' MSL. Down where you are it will probably be a bit lower. Maybe lower 7s or high 6s.
