I like the speed of the .177

[beerhippy]

Just seems more pleasing to shoot than the .22 for some reason.  And when you get an accurate one they seem very effective on squirrels and pidgeons.  First thing I took with the grey ghost was a crow on a wire at 50 yards.  Nailed a squirrel in the back at the same distance and it dropped dead too.

[agninja]

I agree. But what has been said many times before is that accuracy in airgun hunting is always the most important factor. If you are nailing heads, then it doesn't matter if you have a .177, it'll still kill.

[mudduck48]

I like the .22 over the .177 because it is easier to load the pellets and there is more knock down power.

[Cross Pistol Packer]

If only more airguns were made in .20 and ammo not so hard to find

[ped]

pellet choice is getting better ray and barrel blanks are easier to get these days ray,just ordered two weihrauch blanks from silco

[beerhippy]

If only more airguns were made in .20 and ammo not so hard to find

AoA has a fair selection of .20 pellets.  Their prices are better than Pyramid too.  I guess the challenge is to get max velocity in .22 on the 1322 or 22xx platforms.  Today I decreased the volume in my 14" 1322 valve and got a good increase in speed. Lighter valve spring and heavier hammer spring. Got 600 fps with a 16 gr. pellet on 20 pumps.  Dumped all the air too.  So for a serious hunting pistol that would work.

[agninja]

AoA has a fair selection of .20 pellets.  Their prices are better than Pyramid too.  I guess the challenge is to get max velocity in .22 on the 1322 or 22xx platforms.  Today I decreased the volume in my 14" 1322 valve and got a good increase in speed. Lighter valve spring and heavier hammer spring. Got 600 fps with a 16 gr. pellet on 20 pumps.  Dumped all the air too.  So for a serious hunting pistol that would work.

Decreased or increased the valve volume?

[beerhippy]

Decreased.  Used a 5/16" long 1/4" nylon bushing nested inside the valve spring.  On a short barreled gun the higher pressure is worth more than volume.   The valve spring is a stock trigger spring and the hammer spring is stock with a 1/4" long bushing under it in the end cap.  Need to cock it before pumping.  Gun also has a poly port and the barrel port is 5/32".

[agninja]

Decreased.  Used a 5/16" long 1/4" nylon bushing nested inside the valve spring.  On a short barreled gun the higher pressure is worth more than volume.   The valve spring is a stock trigger spring and the hammer spring is stock with a 1/4" long bushing under it in the end cap.  Need to cock it before pumping.  Gun also has a poly port and the barrel port is 5/32".

I guess I don't understand how you can reduce valve volume and overpump to 20. I always thought the point was to pump and dump as much air as possible. As far as I know the only reason to reduce valve volume is to decrease co2 usage in co2 powered guns. I've not heard much about decreasing the valve volume on pumpers, but I could be mistaken.

[beerhippy]

Some weeks back I tried increasing the volume by removing some threads on the male side of a valve.  Actually lost speed with 10 pumps on the same 14" .22 barrel.   With an 18" .177 barrel on 10 pumps it gained about 30 fps if I recall.  Try it for yourself.  None of the changes are permanent and can be reversed.  If you are math inclined you could calculate the ideal valve volume for a given  barrel length and bore.

[1377x]

I had more runners using .22 pellets even with good shot placement . Zero runners using.177
Just my experience and lessons learned. Believing the fpe the better I quickly found our otherwise

[agninja]

Some weeks back I tried increasing the volume by removing some threads on the male side of a valve.  Actually lost speed with 10 pumps on the same 14" .22 barrel.   With an 18" .177 barrel on 10 pumps it gained about 30 fps if I recall.  Try it for yourself.  None of the changes are permanent and can be reversed.  If you are math inclined you could calculate the ideal valve volume for a given  barrel length and bore.

But what if you pump more than 10 times. Maybe once that extra volume you created gets enough pressure then your fps will increase. That's kind of the whole point of the FTP and larger valve volume, it's so you can overpump.

[beerhippy]

It's more about how many times you pump to get to a certain pressure.  An 18" tube will benefit from more volume where a 12" tube will waste additional valve volume.  You have 10" barreled pumpers so increasing the valve volume is going to cause you to pump more for the same speed.  If you reduced the volume you would increase the speed for the same number of pumps.  And pumping to 13 would give you even more.

The nylon spacer I nested in the valve spring has a hole down it's center.  I ordered some 1/4" delrin rod to try and I can see how that small change affects the speed on the same number of pumps.

[beerhippy]

Hey AG, took awhile but I found the post that spurred me on to try reduced volume.  My results are very similar:
http://www.network54.com/Forum/275684/thread/1150373061/Modded+1322+results-+All+shots+are+from+empty%2C

[agninja]

Hey AG, took awhile but I found the post that spurred me on to try reduced volume.  My results are very similar:
http://www.network54.com/Forum/275684/thread/1150373061/Modded+1322+results-+All+shots+are+from+empty%2C

Interesting, from what I gathered there is a threshold at 13 pumps.  Though the chart wasn't color labeled so I couldn't tell if the reduced volume valve is the one that benefits before or after 13 pumps.