FX FX impact M3 stock Max power?

[MJMDP]

Hello all.

I've got a close friend that bought an M3 sometime ago (the M4 was yet to be announced) but only now he started to tune it out of the factory tune.
That said, we are finding it difficult to obtain a "high power" tune out of it.
I know that extras like a heavier hammer weight (and respective probe, etc) will be needed for a really high power tune, but I was under the impression that a stock gun could obtain healthy numbers.
The gun is in .22 standart (600mm barrel).

What kind of power would be the theoretical maximum and whats the maximum preassure the stock weight can open the valve?

 

[bchannell]

I would think somewhere around 70 fpe would be possible with heavier ammo, I know 40-50 fpe and the M3 I had wasn't breathing hard at all.

 

[6gun]

I too have an m3. Stock hammer and spring(i now run a tungsten hammer and stock spring) on mine were best suited to 135 bar or so max. Mine being 700mm I can squeek a little more out but from a 600 you should be able to get close to 60 fpe with 30 grain slugs or easily get to 55 fpe with mrd or heavy hades pellets.

Without a hammer change it will do well under 30 grains. If you do the heavy hammer you can get more but you'll be married to 55 fpe and up more than likely. Also the shot cycle get much more violent and barrel whip comes to play making harmonic tuning much more important.

55 fpe will do most everything you'd probably want to do with a 22 air rifle and still keep a nice refined feel to the gun and you can shoot hundreds of yards without taking part in the current fads of the highest level shooters. I fell for the heavy hammer tensioned barrel slug. Cannon and I don't feel like it was the best decision for me.....it meant buying a gun to cover each performance envelope.

Mine isn't maxed out, I just tuned for what I wanted but I'm at 75 fpe with 34 slugs @145 bar. Playing just north of 1000 fps in my climate resulted in too many transonic and super sonic instances. So I tuned to the mid 900s for the current setup.

 

[Chukar60]

I have found that 145 bar is about tapped out for a stock hammer weights on the M3 22 cal. I was able to get 54 fpe from that set up but the guns were pretty much tapped out at that level.
I added a Huma hammer weight to it. The smaller of the two that come with the kit. I don’t know how far I can push it because I am so happy with how it has been shooting for the last two years.
As for changing the probe out? I wouldn’t waste my time on that. You may pick up a few fps but you trade the solid contact with the projectile and for a single small point.

 

[6gun]

I have found that 145 bar is about tapped out for a stock hammer weights on the M3 22 cal. I was able to get 54 fpe from that set up but the guns were pretty much tapped out at that level.
I added a Huma hammer weight to it. The smaller of the two that come with the kit. I don’t know how far I can push it because I am so happy with how it has been shooting for the last two years.
As for changing the probe out? I wouldn’t waste my time on that. You may pick up a few fps but you trade the solid contact with the projectile and for a single small point.

Pin probe was good for around 10 fps for me iirc, I opened up a pellet probe to match like the huma one and got 7, and none of the feed quirks of the pin probe but I couldn't set seating depth.... So I kept the pin probe and it's issues.

 

[Superpete]

30 caliner M3, 700mm barrel, 120 BAR on regulator, sending 45gn pellets 920fps no problem, can probably go up to 950-960, stock hammer and spring, do the math.