Help getting started

[Shawn1492]

Would y’all mind helping with a multi part question. I’m shooting a mostly stock 10/22. Had some great groups (sub 3/4 inch) at 50 yards with CCI standard velocity. First question, BC for CCI SV, does .11 seem right? Next question. Barrel twist for stock barrel Ruger. Quick search says 1-16. Third question pertains to using Hornady 4dof. When I input a velocity of 1070 and a barrel twist of 1-16 I get a crazy come up for 100 yards. If I use a barrel twist of 1-7 I get a much more reasonable come up. And last with 22lr is it possible to use a calculator or do you just measure your groups every 25 yards and save that info. Thanks.

 

[straightshooter1]

Would y’all mind helping with a multi part question. I’m shooting a mostly stock 10/22. Had some great groups (sub 3/4 inch) at 50 yards with CCI standard velocity. First question, BC for CCI SV, does .11 seem right?

This link should be of some help (assuming you have a good idea of the velocities you're actually getting; with my stock 10/22 I get an average of aroung 1040 fps for CCI SV's):

exterior ballistics

Next question. Barrel twist for stock barrel Ruger. Quick search says 1-16.

That's correct.

Third question pertains to using Hornady 4dof. When I input a velocity of 1070 and a barrel twist of 1-16 I get a crazy come up for 100 yards.

If you check CCI's website, that should give you reliable info:

Buy Standard Velocity 22 LR Ammo | 40 Grain, 1070 FPS | CCI Ammunition

Shopping for the Standard Velocity, 22 LR, 40 Grain, Lead Round Nose, 1070 fps - Learn more about the latest Standard Velocity and other hunting or shooting gear at CCI.

www.cci-ammunition.com

If I use a barrel twist of 1-7 I get a much more reasonable come up. And last with 22lr is it possible to use a calculator or do you just measure your groups every 25 yards and save that info. Thanks.

Yes, you can use a ballistic calculator to get what you want.

You might even use such a calculator to reverse engineer by measuring the differences between a zero and 100 yds (or whatever) and get a BC that better matches your rifle and conditions.