Is there a tune for 34 grain Javelin slugs with the 700mm barrel ?
Yes mine, I just posted above:
My tune for M3 Sniper .22 cal, 700mm vanilla version with no power add on except the heavy slug liner. I tested the slugs at 50 m only.
Note on precision: after testing the slugs with the 2 type of liners it seems I can get 0.9 MOA (12mm @ 50m) accuracy with the slug liner and 1.2 MOA (17 mm @ 50m) with the Standard Liner. Also I didn’t noticed much difference between .218 slugs and .217.
Note on tuning: what really counts is the Reg 2 pressure and the value of the micro adjustment. Since there is 20 micro “clicks” and 5 macro clicks to move half a graduation on the scale, reading 4,75 means 4,7 plus 2 micro clicks. 4,7 = 4.5 plus 8 micro clicks etc. By playing with the micro knob you can adjust the Macro at any level, therefore IMO what is really relevant comparing the various tunes is the reading on the Quick Tune Scale. Last but not least, it seems at high Reg 2 pressure like 150bars, the valve return spring adjustment has negligible effects: it seems the return spring is too weak for the pressure at 150b.
1 Reg 190b, 2 Reg 150b, Valve adjustment at 5 (one full turn after the 4 th line). Heavy Slug Liner.
Patriot .218 34 gr; Speed 922 fps; E/S: 3; S/D: 1.3; Accuracy 0.8 MOA; Macro 14, Micro 4,75 (2 micro clicks above 4.7)
H&N .217 30 gr; Speed 975 fps; E/S 4; S/D 1.5; Accuracy 0.8 MOA, Macro 13, Micro 4,6
Important: all my E/S and S/D are measured for each 5 slug grouping with a Magnetospeed “bayonet” type chronograph.
BUT, now that I've tried to install the FX power slug kit my M3 has been transformed into a 2000 $ tomato pick and there is no way to return to the former situation. My humble advice: never try to imrove something that ain't broken.
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