View Full Version : Fenman Power Adjustment**Help

The Birdman
24-05-2004, 09:28 AM
I have a new Theoben Fenman .177 about 1 month old. Put it through the Chrono and with Premiers (Which are the most accurate so far) AA Field, Accupels its coming out at just over 10fpp the only pellet that boosts it is the H7N Hollowpoint which take it to an illegal 13fpp. 2 things, Does anyone know how i can increase the power slightly ? Also every rifle i have tried H&N Hollowpint on they come out at least an extra 2FPP more than any other pellet. Anyone else encountered this with these H&N's ?

24-05-2004, 09:54 AM
Something don't sound right to me, you should not be getting such a increase with lighter pellets.
Seems to me you maybe doing something wrong with your crono :confused:

The Birdman
24-05-2004, 09:57 AM
I'm confused ! H&N Hollowpoint are 8.6 and e.g Accupels are 7.9, Therefore the H&N are heavier.

24-05-2004, 10:08 AM
According to the H&N site they are 7.10 ;)


The Birdman
24-05-2004, 10:11 AM
Definatly 8.6 Bought from uttings.com. Thats why they are coming out more powerful then ?

24-05-2004, 10:12 AM
I just put 3 of each pellet through my pistol and got


4.88 ft/lbs


4.51 ft/lbs

These were in .22 cal hope this helps

The Birdman
24-05-2004, 10:13 AM
Andyman, So really if there's no easy way of upping the power, The answer obviously is too get a more accurate "Heavier" Pellet, But then again 10FPP is ok really anyway eh ?

The Birdman
24-05-2004, 10:14 AM
Thanks for your tests, Does help cheers.

24-05-2004, 10:21 AM
Gas rams prefer lighter pellets.

Best to take your gun to a gunsmith or back to theoben if your not happy with the power and they would adjust the power for you.
No one on here will tell you how to increase power as it's against board rules, sorry.

The Birdman
24-05-2004, 10:23 AM
Say no more..Cheers.. I'll leave as is for now as it's only for FT anyway.

24-05-2004, 11:59 AM
it is easy to adjust fenmans power

just take away his board privilages.

oh sorry you ment the theoben fenman ...must read the titles properly

24-05-2004, 03:11 PM
Since the rifle is capable of exceeding 12 ft/lbs with certain types of pellet, doesn't that technically make it illegal without a FAC?

24-05-2004, 03:19 PM
Hmm you have two of these then? If you pump em up they will not only be illegal but will shoot harshly