FX Royale 3 Position Power Wheel Question

[MP44]

What size orifices for the .22cal?

I like the velocity my rifle shoots at full power but would like to bump up the medium power level. On medium it is shooting 15.9 JSBs around 690 and I would like it to shoot them @ 770fps. Knowing the size of the ports will give me an idea on how much to enlarge the medium to get me where I want.

 

[MP44]

Anyone?

 

[chasdicapua]

I don't know the answer. I have royale with the power wheel and I had the idea of increasing the high and medium so that the high would shoot the JSB .25 heavy pelletsand the medium would shoot the JSB 25.4 grains. Both at around 870 - 880. 

 

[MP44]

I took the adjuster out and using hex keys to "measure" the holes, it looks like high power is 4mm and medium is 2mm. I am going to try to find locally a 2.5mm or #39 drill bit to open up the medium.

 

[MP44]

UPDATE:

On hi power: 14.3 JSB - 940 fps, 15.9 - 905 fps & 18.1- 870 fps.

Medium: 15.9 JSB - 690fps & 14.3 JSB - 725

Drilling out the medium power port to:

7/64": 15.9 - 745 fps & 14.3 - 770 fps

1/8": 14.3 - 788 fps

9/64": 15.9 - 770 fps & 14.3 - 797 fps