Not sure if I follow this....57.8" at 200 is ~29moa. The value of 29moa at 50 yards would put the shot 14.5" high. These were just rounded figures, not the true MOA conversion factor.
22lr standard, 100, 150 and 200 yard zero?
- Thread starter bandit86
- Start date
Not sure if I follow this....57.8" at 200 is ~29moa. The value of 29moa at 50 yards would put the shot 14.5" high. These were just rounded figures, not the true MOA conversion factor.
Some people dont know moa well.
I sure dont.
1 Moa as I understand it is 1" at 100yds.
So correct at 50yds it would be .5"
So I think your right, 58" halfed is 29" at 100yd so galfed again at 50 yds so 14.5" high
I sure dont.
1 Moa as I understand it is 1" at 100yds.
So correct at 50yds it would be .5"
So I think your right, 58" halfed is 29" at 100yd so galfed again at 50 yds so 14.5" high
1" at 95.5 yards. But 1" at 100 is easier for mental arithmetic.
No one has mentioned the need to use a chrono yet. Or at least not specifically.
The BC (Ballistics Coefficient) of the bullet also matters. As does supersonic vs subsonic since the BC for supersonic changes as it drops to transonic and then goes subsonic on longer trajectories. So anything you find online will at best be an illustrative diagram at best. To figure out how accurate it is you'd want to test the ammo YOU are using with a chrono. You'd test it at 10 feet and then, and this is the risky part, you'd set it up on the 50 yard berm and shoot through it to measure the bullet velocity at 50 yards so you could determine the BC for that first portion of the travel.
The online calculators have inputs for BC, or should have, but when the BC changes as the bullet drops through transonic and into subsonic none of the calculators will tell the TRUE story. You sort of have to build that on your own. For example if you zero at 100 then shoot 25, 50, 150 and 200 yard targets and take note of the rise and drop of the groups you can compare those to the online calculators and fudge the BC values and bullet speeds to try to approximate what you found. But without a place to put the various true BC values for each speed range of the trajectory it'll always just be a "close but not perfect" sort of chart. Nice for showing principles but useless for any sort of scope setting estimate if you're hunting small critters or need to hit an "x"zone.
The BC (Ballistics Coefficient) of the bullet also matters. As does supersonic vs subsonic since the BC for supersonic changes as it drops to transonic and then goes subsonic on longer trajectories. So anything you find online will at best be an illustrative diagram at best. To figure out how accurate it is you'd want to test the ammo YOU are using with a chrono. You'd test it at 10 feet and then, and this is the risky part, you'd set it up on the 50 yard berm and shoot through it to measure the bullet velocity at 50 yards so you could determine the BC for that first portion of the travel.
The online calculators have inputs for BC, or should have, but when the BC changes as the bullet drops through transonic and into subsonic none of the calculators will tell the TRUE story. You sort of have to build that on your own. For example if you zero at 100 then shoot 25, 50, 150 and 200 yard targets and take note of the rise and drop of the groups you can compare those to the online calculators and fudge the BC values and bullet speeds to try to approximate what you found. But without a place to put the various true BC values for each speed range of the trajectory it'll always just be a "close but not perfect" sort of chart. Nice for showing principles but useless for any sort of scope setting estimate if you're hunting small critters or need to hit an "x"zone.
Cci site has a good write up on bullet speeds. If you crony yours at muzzle you can see how much it would slow.
http://www.cci-ammunition.com/products/detail.aspx?use=1&loadNo=0032
