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Airguns by Make and Model => Crosman Airguns => Topic started by: Marc on January 04, 2020, 04:08:29 PM

Title: 1300kt - Flat Top Valve and Piston - what does it add?
Post by: Marc on January 04, 2020, 04:08:29 PM
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!
Title: Re: 1300kt - Flat Top Valve and Piston - what does it add?
Post by: Rob M on January 04, 2020, 04:18:11 PM
makes the gun more efficient , so u might need to pump less times for a given velocity.. Headspace is the enemy
Title: Re: 1300kt - Flat Top Valve and Piston - what does it add?
Post by: Marc on January 04, 2020, 04:59:55 PM
Any idea what kind of velocity you'd see from a set up like this?
Title: Re: 1300kt - Flat Top Valve and Piston - what does it add?
Post by: Tom Tucker on January 04, 2020, 05:04:07 PM
I have a 1300KT, 18-inch .22 cal.

Stock:  500fps @ 10 pumps (14.3 grain)
With FTP/Valve:  500fps @ 7 pumps, 580fps @ 10 pumps.
Title: Re: 1300kt - Flat Top Valve and Piston - what does it add?
Post by: Marc on January 04, 2020, 05:57:42 PM
That's pretty good power - looks like more than a stock R7?

How is accuracy at 20-25 yards?
Title: Re: 1300kt - Flat Top Valve and Piston - what does it add?
Post by: Tom Tucker on January 04, 2020, 06:30:21 PM
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.
Title: Re: 1300kt - Flat Top Valve and Piston - what does it add?
Post by: Rick67 on January 04, 2020, 07:35:56 PM
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.
Title: Re: 1300kt - Flat Top Valve and Piston - what does it add?
Post by: Marc on January 04, 2020, 08:29:06 PM
Can the Crosman barrels do that good?  I really want a .22 cal. and an 18" length.
Title: Re: 1300kt - Flat Top Valve and Piston - what does it add?
Post by: Rick67 on January 04, 2020, 08:47:01 PM
Have good luck with .177 Crosman barrels.

My most accurate is the 24".

That one can do fantastic groups at 38y..
Title: Re: 1300kt - Flat Top Valve and Piston - what does it add?
Post by: rsterne on January 04, 2020, 11:06:04 PM
Here is a comparison between stock and an FTP....

(https://i378.photobucket.com/albums/oo221/rsterne/22%20Uber-Pumper/2289Pistons_zps436278b6.jpg) (http://s378.photobucket.com/user/rsterne/media/22%20Uber-Pumper/2289Pistons_zps436278b6.jpg.html)

Bob
Title: Re: 1300kt - Flat Top Valve and Piston - what does it add?
Post by: Martis 1 on January 04, 2020, 11:30:47 PM
Quote from: Marc on January 04, 2020, 08:29:06 PM
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.