Huben Huben GK1 tuning
- By ctshooter
- Air Pistols
- 8 Replies
Not sure it was mentioned, but the Huben in .25 generally needs a slug sized for .254. Not sure what slugs you are shooting - but I'd check to confirm that. The H&N Grizzlies may or may now shoot well from the Huben - you're going to have to test this out - and I wouldn't do it in the field.Can anyone help me out with a basic starting point or tune for H&N 31Gr (.25cal). When I purchased the huben through airgun tactical it cam with 44gr heavies. They stated in the paperwork that the heavys required the screw to be all the way out at max to work properly. It runs flawless however i would like to experament with some lighter slugs and try and get my shot count up a bit. I have some H&N Grizzly 31GR on hand. I have a chrono but not with me and was wondering if i should just dial the screw in 1/2 a turn at a time until i loose functionality or what would be the best place to start without shooting for a specific chrono speed?
In regards to the current tune - it sounds like you are wasting a lot of air each shot. I have my .25 tuned for the Altaros 6.46mm 51gr slugs shooting @ 900 fps for around 90 fpe. With that I can get a full mag plus a little more from a ~275 bar fill down to reg @ 19mPa.
When you do tune for a 31gr slug I would drop the reg pressure to around 15mPa and start testing from there. There are mentions in the manual (https://www.newenglandairgun.com/uploads/3/4/5/3/34532711/huben_k1_manual__8-25-2021_.pdf) on Page 8 for starting reg pressure and power wheel settings for different weight projectiles.
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