Huben GK1 .25 tuning for Altaros & JSB - charts and data

[weevil]

I hope they’re also shooting accurately.

 

[primaz]

Cheaper lead-frees

Less expensive is always good, but on a more serious question, are these lead free lighter and harder .25 pellets shooting more accurate than the typical JSB's,? I know "weevil" has experienced improved accuracy with the .22 GTO lead free pellets. Also is there any issues of jamming? I read on another post that one person said they have had jamming issues with the .25 GTO's?

 

[JDGriz]

@weevil @primaz I don't actually know how accurate they are; my current shooting distance is 7 meters. I used them for upping the number of shots per fill, at low power, but my new pump (the Huben pump) is actually fairly easy to use, so I moved to plain 25gr. JSBs. I've had no jams or any other issues so far.

 

[Noob with alot questions]

ty for all the data!

 

[paperp]

HI ALL GREAT INFO! BUT WHAT DO THE GROUPS LOOK LIKE?? FROM THE ALTAROS SLUGS? THANKS PAPERP

 

[steve-l]

My results with both the V1 and V3 in .25 is similar. I now shoot exclusively with the JSB 25.4 gr pellet, not lead free. I charge the guns to 310 bar and tune to about 700 FPS. I get a full (17) round mag at virtually the same speed and shoot one ragged hole at 25 meters. The gun is designed for pellets not slugs. I use the 25.4 JSB pellet as opposed to the 39 gr pellet for economy as you get 50 more pellets in a tin for the same cost. After one mag the tank pressure drops to 220 bar. I then recharge the gun back to 310 bar.