yep a three shot string at 22 pumps 622 to 628 mfps,
then I did
8 = 484
10=494
12=524
15=549,558
17=562,570
18=576,584,585
20=595,601
22=622,628,625
25=629,629
the no guts know glory part is the transfer port and and 14.5 barrel are now .161 or so...
to think bare bones
roll to solid = $ 11.00 mandatory! (IMO, on a buget can be done with drill bit very cheap)
14.5" barrel = 13.02
1322 = 44.00
72.00 (Don't forget this is tax and shipping math)
would get you very close
stock ,pump arm and steel breech takes it to 120 or so,
I think hunting practice 17-20
keep fresh plinking 10-15
the pump cups have a built in depth of cam over pressure gage a very slight indent of valve nose is what I think is healthy for the pump tube...
piston is not stuffed...
but yep I hit close to my goal
and down at 17 pumps about 10.4 mfpe no more stress than stock IMO (imo?)
basically up about 15 fps till 17 pumps then it's BYe BYe reliably up to 22 pumps.
before porting erratic past 17 pumps...
14.3 Premier hollows unsorted measured avg. over 15" , converted to mv using chair gun..
Still room to hog out valve but I am happy with this recipe as is,
http://www.gatewaytoairguns.org/GTA/index.php?topic=53940.0 (http://www.gatewaytoairguns.org/GTA/index.php?topic=53940.0)
It took me from 8/4 to 12/20 but it feels good to meet my 1322 goal...
Any one want to help me figure out a budget 1325xlt
using my 2100 pump???
on my backpacker i'm getting just under 12fpe at 12 pumps at 15 i was over 12 so had to make a new rear cap with less preload so that it starts holding air at 10 pumps peaks power wise at 12 pumps and power goes down due to not enough hammer strike at more than 12 pumps(the only down side to it holding air at 10 pumps and going to 12 pumps is having to dry fire it after every shot to keep the next shot consistant with the previous one)
it's got a flat top piston and valve which has had a medium tune and a 14" barrel
ped
I squeezed shut my valve spring and trigger spring and toasted with a bic very briefly if a second, had to pull 1377 back out; was a bit to light ; fired while pumping till third times "
duh" charm. hole in the wall not amp or guitar or sliding door or large window other two in grass :-[
stock polished hammer and untouched spring.
exhaust poppet coned and stem slimmed
valve is missing a few threads and did a little boring the thick walled portion
exhaust passage eased to 3/4 of way to poppet seat
valve matched cup very well but needed .053 shim
sanded lead till pellet almost fell into just past port (had to be reminded here it's spelled leade and then found info that I was going about it right )
light tap seats the pellet usually
or very easy to make sure with shaped plastic tool I made
Stock bolt
Stock transfer port and barrel port bored to .16 or so
stock before any mods the valve was dumping all air at 22 pumps all three times I tried and checked. seems unlikely but is truth
but became erratic at 16 pumps so I did not pump it that high
Quote from: K.O. on December 20, 2013, 09:47:52 AM
http://www.gatewaytoairguns.org/GTA/index.php?topic=53940.0 (http://www.gatewaytoairguns.org/GTA/index.php?topic=53940.0)
It took me from 8/4 to 12/20 but it feels good to meet my 1322 goal...
Any one want to help me figure out a budget 1325xlt
using my 2100 pump???
what exactly is your plan
i dont understand what using my 2100 pump means
do you mean something like this? but in .25
http://www.airgunhome.com/agforum/viewtopic.php?t=2334&highlight= (http://www.airgunhome.com/agforum/viewtopic.php?t=2334&highlight=)
if so
then it depends on whos going to do the machining of the custom parts needed and the factory parts needed. what do you have on hand to help with this build?
Hi Ed yep 13xx trigger group 2100 pump tube (.25) later but plastic breech 22 to start...
1325 extra long tube
Right now just have a 2100 and a flat top valve cap (Made by Big Bore Bart) and plastic 1322 breech and bolt. Have some tools...
More Inspired by this one but need a more budget build (for experience) first but when final stage at .25 would like to hit low 600s...
http://www.gatewaytoairguns.org/GTA/index.php?topic=37401.0 (http://www.gatewaytoairguns.org/GTA/index.php?topic=37401.0)
More to say but My youngest (Daughter) just hit town and I miss her and we are going to go run around a bit...
be back later tonight...
:) :) :) :) :) :) :) :) :) :) :)
HAPPY HOLIDAYS!!!!!!!