I think I really need some collective wisdom from .22 LR long(-ish, -er) range shooters here.
I run two SW M&P 15-22 (16" bbl) 9x scoped for practicing scoped prone/DMR fundamentals. Sometimes alone, sometimes with my son.
And I am not successful devising a recipe for consistent 200 yards ballistics.
I know 15-22 are not tuned bolt guns, not even close, but there has to be a recipe for 200 with these. I won't even try to take them further (unless, of course, THR sheds the light on the ballistics enigma here).
Hear me out.
Ammo: CCI Mini-Mag, measured avg. (over multiple sessions) ~1130 fps, fairly consistent, BC G1 0.13 (found multiple times online, can't even recall the number of sources, this has to be about right).
Zero: 100 yards
Scope height over bore: 2.767" (if not super-precise, this has to be very close. After experiencing my ballistics calculator issues at 200 I went back and recalculated this using receiver, rings and scope tube dimensions).
Ballistics calculator-based data is works just fine up to 200 yards.
My range even has an unknown-distance metal silhouette and a plate at 175 (laser rangefinder-based). 12.38 MOA come up rings them.
On the flip (shorter range) side, -1,55 MOA for 50 rings small flippers just fine.
Then 200.
Calculators-base come-up: 17.12 MOA (please feel free to run the calculations yourself).
It's short, like, significantly!
I don't have paper at 200, but I can see dirt splashes. Fairly frequently 17.12 MOA will actually ricochet at the steel in front with a very audible ring.
I start dialing up, seems like I am still often short with 20 MOA come-up.
I am fairly used to relying on ballistics calculators. Maybe they don't hold up so well with .22 LR father out.
Not going for groups. Steel silhouette and a plate.
What are your values? What should I be looking at? Temperature, pressure? Scope issues? Or maybe this is the case when BC no longer holds up at the distance?
Thank you, THR!
I run two SW M&P 15-22 (16" bbl) 9x scoped for practicing scoped prone/DMR fundamentals. Sometimes alone, sometimes with my son.
And I am not successful devising a recipe for consistent 200 yards ballistics.
I know 15-22 are not tuned bolt guns, not even close, but there has to be a recipe for 200 with these. I won't even try to take them further (unless, of course, THR sheds the light on the ballistics enigma here).
Hear me out.
Ammo: CCI Mini-Mag, measured avg. (over multiple sessions) ~1130 fps, fairly consistent, BC G1 0.13 (found multiple times online, can't even recall the number of sources, this has to be about right).
Zero: 100 yards
Scope height over bore: 2.767" (if not super-precise, this has to be very close. After experiencing my ballistics calculator issues at 200 I went back and recalculated this using receiver, rings and scope tube dimensions).
Ballistics calculator-based data is works just fine up to 200 yards.
My range even has an unknown-distance metal silhouette and a plate at 175 (laser rangefinder-based). 12.38 MOA come up rings them.
On the flip (shorter range) side, -1,55 MOA for 50 rings small flippers just fine.
Then 200.
Calculators-base come-up: 17.12 MOA (please feel free to run the calculations yourself).
It's short, like, significantly!
I don't have paper at 200, but I can see dirt splashes. Fairly frequently 17.12 MOA will actually ricochet at the steel in front with a very audible ring.
I start dialing up, seems like I am still often short with 20 MOA come-up.
I am fairly used to relying on ballistics calculators. Maybe they don't hold up so well with .22 LR father out.
Not going for groups. Steel silhouette and a plate.
What are your values? What should I be looking at? Temperature, pressure? Scope issues? Or maybe this is the case when BC no longer holds up at the distance?
Thank you, THR!