Update: My modified CED M2 chrono is now ready and I made a quick BC test with lapua midas+ 22 lr. ammo between 3,5 and 144,5 meters.

Gun is Sako P94 varmint, ammo lot is 06843/51325 and atmospheric conditions during the test were: +5 C, 997 hPa, 95%.

Here are the results:

String V3,5

1) 323.1

2) 321.9

3) 321.9

High: 323.1

Low: 321.9

E.S.: 1.2

Ave.: 322.3

S.D.: 0.6

String V144,5

1) 262.0

2) 257.8

3) 255.2

4) 260.0

5) 258.0

High: 262.0

Low: 255.2

E.S.: 6.8

Ave.: 258.6

S.D.: 2.3

By using these as input values one can calculate that BC is:

RA4 bc = 0,113 (with JBM)

RA4 bc = 0,110 (with BFX)

I think that difference between these values is due to two things. For some reason RA4 drag curves are not exactly the same in these two calculators and there is some minor differences in air density models. My personal estimate is that accuracy of this BC test is about +/- 5%. Consequently results are in line with those presented in McCoy's .22 lr bullet study which suggests 0,113 RA4 BC for tenex round nose when using BFX as a ballistic solver.