1300kt - Flat Top Valve and Piston - what does it add?

[Marc]

Looking at a 1300kt with an 18" or 24" barrel in .22 cal.  What will a flat top valve and piston do?  I'm not looking to pump more than 8-10 pumps.

Thanks!

[Rob M]

makes the gun more efficient , so u might need to pump less times for a given velocity.. Headspace is the enemy

[Marc]

Any idea what kind of velocity you'd see from a set up like this?

[Tom Tucker]

I have a 1300KT, 18-inch .22 cal.

Stock:  500fps @ 10 pumps (14.3 grain)
With FTP/Valve:  500fps @ 7 pumps, 580fps @ 10 pumps.

[Marc]

That's pretty good power - looks like more than a stock R7?

How is accuracy at 20-25 yards?

[Tom Tucker]

The accuracy at 20-25 yards is... better than me. 

The best I did with it was a 1.5-inch group rested at 45 yards with a $20 4x32 scope and 15 pumps per shot.  If I could have seen the target better and had a thinner reticle, I probably could have done better.

[Rick67]

Thin reticles do help a lot with accuracy.

My 1377 with a 14" LW can do 1 hole at 25y with 5 shots.

No mods done to the power as I only do 7 pumps for the aforesaid distance.

Mine likes JSB/AA pellets in 10g best.

[Marc]

Can the Crosman barrels do that good?  I really want a .22 cal. and an 18" length.

[Rick67]

Have good luck with .177 Crosman barrels.

My most accurate is the 24".

That one can do fantastic groups at 38y..

[rsterne]

Here is a comparison between stock and an FTP....



Bob

[Martis 1]

Can the Crosman barrels do that good?  I really want a .22 cal. and an 18" length.

My new gun certainly doesn’t.  I got one from the custom shop for Christmas.  It’s got the long steel breech, 14” Crosman barrel, and carbine stock.  Scoped, the best I’ve managed is around a 1/2” 5 shot group at 20 yards, but most groups are a bit bigger than that.  That’s after multiple barrel cleanings and trying a lot of pellets. 

Others I’m sure have had better luck.