Broke 50fpe with my Kral without breaking the cocking arm.

[thammer]

The power tune is a success. I backed the power down a bit to even the curve. At 3000psi with JSB 25.4gr kings it starts at 940 fps peaks at 968fps and drops back to 940 over 35 shots. Here is 20 shots I got on film from a partial fill after playing with the tune. Gun is still getting 900fps at 1250 psi and would be a great candidate for a 50 shot regulated tune at 900fps. 

 

[Rod]

Hey thammer- I saw the video the other day. How does it group? I found a sweet spot with my gun at 750 FPS, At 20 yards in getting 3 groups of 10 all at 1/4 cTc. That's only 32 fpe.

i cranked down the spring on my stock gun and got 36 fpe. Around 790 fps, the groups opened up to 1/2 cTc at 20 yards

so... I'm wondering how your groups look at 50 fpe

thanks

 

[thammer]

Just finishing the tune. I will be getting some range time mid week to try out the grouping. I ordered several hunting pellets to see what it likes. 

JSB 25.4gr kings 
JSB 33.95 heavy
Predator polymag 26gr
H&N Crow Magnum 26.4gr
H&N grizzly 31gr

Will post the results by the weekend. 

 

[AJ]

Its pretty quiet considering it is doing 50fpe

 

[AJ]

Excellent posts. I am not a power hungry shooter and would consider one in 177 providing it gets good accuracy at least Marauder like accuracy at 50 yards sub 1 inch or better. Would your tune do any good or be of any benefit for a 177 if I want to back the power down to shoot primarily at 12-14fpe? I recently bought a used 50fpe fully hot rodded 22 WAR Armada (Marauder) with Jim Gaska LW barrel and had just backed the power down to 22fpe and am content with it at that level. Sort of like buying a Supercharged Corvette and driving it like grandma.

 

[thammer]

This tune along with an SSG (spring stop guide) would probably be ideal. Smaller transfer ports but other than that should Yeild over 100 shots on a fill.