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#100 – Why is 22lr different?

#100 - Why is 22lr different?

00:36:04  | The differences may shock you. This week Bryan and Francis discuss what makes 22lr different from centerfire covering; trajectory, zero range, aerodynamic drag, muzzle velocity, and more.

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One Comment

  • Billy Green says:
    November 14, 2023 at 8:38 am

    Very good video with a lot of interesting points. I have been shooting .22lr rifles at extended ranges for a long time and here are some important points I would like to share:
    A .22 rifle scales down to 20%-25% of a .308 Winchester rifle so if scale your distances and target sizes accordingly the elevation and windage will be very close to the same for both rifles.
    Here is an example using my data for two of my rifles:
    27’ elevation, 60°F, 90% Humidity, 30.21” Absolute
    Eley Force, 42 grain, 0.149 G1, 1032fps, 50 yard zero
    Berger ammo 185 .308 Juggernaut, .284 G7, 2617 fps, 100 yard zero

    The .22 at 200 yards needs 7.75 mil elevation and 1.91 mil for a full value 10 mph crosswind
    The .308 at 860 yards needs 7.71 mil elevation and 1.76 mil for a full value 10 mph crosswind

    This pair scales to (200/860)100= 23% for distance while both the elevation and windage values are within 0.1 mil on the turrets.
    If you are shooting 10”-12” steel at 860 yards for centerfire then use 3” targets at 200 yards for the .22

    While a lot of shooters don’t use a Powder Temperature sensitivity correction for centerfire except for extreme ranges and temperature deltas it is an absolute must for the .22 rimfire. In the example above the .22 velocity is 1032 fps for the actual atmospheric conditions of the shot but the rifle was zeroed at 98°F and 1188 fps. This would not be an issue for the .308 rifle but it is essential to calculate the firing solution for the .22
    using the temperature sensitivity for the Eley Force ammo which is 4.1 fps per degree Fahrenheit in my rifle.
    98°F-60°F=38°F
    38 x 4.1 = 155.8
    1188 fps – 155.8 fps = 1032.2 fps
    As you can see this is a significant difference and once 4.1 fps per degree Fahrenheit is entered in the solver it becomes effortless so be sure to record the temperature and velocity when zeroing your rig because even a 10°F temperature delta is 41 fps with this ammo.

    Thank you for the opportunity to share this information,
    Bill

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