slowing down the at44

[Whatsquirrel]

After shootjng across the chrony with my new at44-10 long qe. Man this thing is blazing pellets. 14.3 cphp avg 1030fps. But after about 15yrds the groups open up. My question is would slowing it down to around 900-925fps help on the accuracy? That's still 25fpe. Also while I had it apart I check the transfer port & holes on the valve. The top hole doesn't line up with the t.p. Would I benefit if I plug the 3 most bottom holes. I'm just trying to get the most efficientcy & accuracy out of a common pellet. Or am I wasting my time. Thanks.

[Motorhead]

In typical PCP fashion ..... MOST all like and do best with HEAVY pellets !!
18-21 grains honestly would be my first place thing doing in slowing things down.

From there you rework valve some and start choking down the transfer port size ... or install a regulator perhaps ?

[Whatsquirrel]

Thanks. I'm gonna try some 21gr copper coated & see how they work.

[rsterne]

Try 18.1 gr. JSB Exact Heavies....

Bob

[Whatsquirrel]

I've tryed 18.1 heavys. They shoot about a 1" group at 40yrds I feel it should shot better.  It's a new gun so I'm just gonna shoot it for now till I get a few pellets through It then I'll see how it does. 

[Ratpaker]

I have a at 44w10, was shooting very fast when new, around the 1000 fps on some pellets.
I reduced hammer spring tension by a turn and a half, it now shoots 850 fps with 18 grain JSB pellets.
I have found that accuracy and shot count improved with the reduction in power, well worth doing.
Mine shoots JSB express, 16 grain and 18 grain all very well, about 3/4 inch at 50 meters.

[Whatsquirrel]

I'm gonna try to turn the spring down. How much did help efficiency? I would be some what happy with 3/4" groups at 50yrds. Even at 850fps that's plenty of power with 18.1 gr pellets.

[Ratpaker]

went from 30 shots between 190 bar to 100 bar to 40 shots between the same pressures.