Struggling between Bullboss in .22 or .25

[Tygon]

Will somebody please post a shot string of their bullboss in .25 cal.
And I would also like to see what a min and max power range is with the hammer spring adjustment.  I am more interested in shot count by giving up fps.

[AwwShoot]

Finally put everything together for the compressor today and filled the BullBoss, Fired one shot and put it away. Not sure if the loud noise was from the Airgun for the 28gr pellet smacking the tree but wow what an echo! LOL

[Dan H]

Will somebody please post a shot string of their bullboss in .25 cal.
And I would also like to see what a min and max power range is with the hammer spring adjustment.  I am more interested in shot count by giving up fps.

   931 - 907 first mag   907 -  860's   2nd mag .... .25   jsb 25.39g    stock out of the box no mods at all ...

[Back_Roads]

 Mine is shooting about the same , out of the box, I;m still on the fence on backing the hammer spring back or bumping it up a 1/4 turn or so. I have some Nelson .250 hollow points to test if they cycle in the mag ok.

[redlined_b16a]

Will somebody please post a shot string of their bullboss in .25 cal.
And I would also like to see what a min and max power range is with the hammer spring adjustment.  I am more interested in shot count by giving up fps.

In my experiance the hammer spring preload dod not do much.

.25 grain I can get up to 930fps
27 grain 880 fps and 33 grain about 815 fps.

18 shots extreme spread of 11-13
27 shots extreme spreads about 60

Pretty great numbers.
I could not get 33 grain ammo to fly faster than 815 fps though.
Even with a thicker spacer and more hamner preload.
More preload offered less fps.
Its lowest preload yeilded 700fps average for 35 shots probly could have gotten 44 shots

[hennigm]

what caliber do you already have?  I have .22. So all mine will be .22.  My bullboss has a huma regulator in it, 3 full magazines at around 873, drops off after 30 shots to 830 or so.  Very accurate.

[redlined_b16a]

Here was my out of the box shot string.
https://www.gatewaytoairguns.org/GTA/index.php?topic=136066.0

After my hammer issues its shooting slightly slower but still a consistant string and low extreme spread.
With 30 grain barracudas the e.s. was 9

[Dan H]

The bullboss out of the box shoots the best with the jsb .25  25.39g pellets , they also work the best so far in my other 3= .25 guns  ... grub screw mod to the valve .....some port work, and you could get the heavy stuff up to 900 fps .... but I really think the 25.39 is going to have the better shot count ,and most likely most accurate .... and more than anything accuracy kills .... 

...and if you need more fpe just grab a carnivore .30 !  it pretty much doubles fpe  with that gun jsb 44-50g pellets are the choice ones  although I do have some new pellet molds coming soon that are very close design to jsb  that Bob R .30  designed if these turn out to be accurate this will be a game changer for .30 cal guns then we can make our own way  cheaper ammo ... the new molds come with 3 pin sets to create 3 different weight pellets ... the pin sets create the hollow area in the tail  ....

now what does that have to do with our .25 guns ? .... they are also going to make these molds for .25  SWEET !

if you get a pellet trap and collect all the pellets after you shoot ...you can just melt the smashed pellets ,and make new ones CHEAP ! I do this for my big bore guns ,and trust me its the better way to shoot all the way around , you can cast ,and custom size ammo to  the particular barrel that you are shooting ..
 

[KnifeMaker]

I have quite a few molds for th4e .257. I wold love to try some of the cast pellets, however, we all know how pellet fussy an AG can be.

I don't know that I am willing to risk the money on a pig in a poke. I want to hear some results!   But first, they have to make the molds. LOL

Knife