Crosman 1322 1377 mod questions

[Raden1942]

 Ok so I have a 1322 I want to mod to the max. I already have alliance hobby flat man pack which come with all the power mods minus the adjuster. I want to use it yo kill rabbit under 50 yards. I also want to keep the barrel 18inches or under. So I am wondering a couple of things. A 1300kt from the custom shop has a 14.5in lothar walther barrel and a steel breech for like 140 after agnation discount but thats in 177. I dont know if the gun with power mods can kill a rabbit ethically at 50 yards. Could someone who has done these power mods on a 14.5in 177 barrel please let me know the chrony numbers your getting? Also the cost of modding my pistol to longer barrel is about the same as buying the 1300kt and I am not sure if its worth it to even mod mine or if i should buy a 1300kt and start over. Also does anyone know of a source for lothar walther 22cal barrels that are 18in. This is my original desired length and caliber but the 14.5in 177 seems like too good of a deal. Thanks guys you have been helping me alot these days. I always have new projects and your ideas are so important to me.

 

[c_m_shooter]

I get 680 fps with 7,9 CPLs and 18 pumps. More pumps and it doesn't dump all the air. Mellonair flat top piston and valve, mellonair prepped 14 inch barrel, and hammer spring from a discovery. I wouldn't hunt past 30 yards with it.

 

[Raden1942]

Oh dang thats not very fast. Thanks I thought id get 750 or something I appreciate it. 

 

[fishinwrench]

Keeping an eye on this thread. I have a 1300kt project coming up myself. It needs more zip.....but I don't wanna have to pump my arm off to get it.

 

[c_m_shooter]

The pump count I'm confident off the top of my head, but I'll have to check my notebook tonight bout the velocity.

 

[MileHighAirGunner]

Unfortunately, discounts including airgun nation discounts, won’t apply to Crosman custom shop guns. 

 

[fishinwrench]

Just ordered a flat top piston, valve, and Boss TP for my 1300KT .22

Stock I could barely get 500fps with 14.3gr. pellets and 16 pumps.

Hopefully this will wake it up a bit. What would make me happier than a pig in slop would be 550fps with 12 pumps.....but that is probably not gonna happen.

 

[c_m_shooter]

1377 with 7.9 cphp

10 pumps- 569 fps

11-572

12-586

13-601

14-617

15-617



flat top with 14 inch barrel

10 pumps-586fps

11-590

12-605

13-623

14-625

15-641

16-647

17-663

18-662

20-678

 

[Raden1942]

Yeah 678 to 700 sounds lovely to me. I can kill rabbit all day with that if the accuracy is there. I know I should go 22 cal but it just drops too fast. Lothar walther should keep my pellet on target. 

 

[Scrufhunter]

You need more than just higher pressure in the valve. You need more volume. If you open the valve, cut 3-4 of the male threads off. Long before this website, there was a site all in yellow. This mod was second on the list after flat top/piston valve. Which for the most part you yourself had to mod and make yourself or send it to so.some. All of whom are probably hanging out with worms six feet under

The volume of a stock crosman valve is less than the volume of a .22 barrel @ 14.5. I believe it is equal at 12 and greater by 10% in a 10" barrel. It is easier to get a 177 to performer better, the lower volume of the caliber barrel in relation the volume in the valve. I believe crosman figured that out with the 2289 came with a 12" barrel and a quick release for the 1389stock

Let's say your barrel has a volume of 12 cu inches and your valve has 10cu inches. 

 

[Raden1942]

I bought the alliance hobby valve, flat top piston, transfer port and hammer spring. 

 

[fishinwrench]

Flat top valve, piston, and Boss TP installed..... Velocity went up ever so slightly (getting 550 fps now with 16 pumps) but for some reason I can only get about 20 shots before accuracy goes to hell and I have to clean the barrel.

There must be a bunch of oil in the valve. Hopefully it will clear out fairly soon.

Interesting thing is that my valve retains air at any more than 16 pumps, so I may need a heavier hammer spring. The stock valve would dump 18 pumps (???)

I swear, there's no end to this poop !

 

[Raden1942]

Yeah I didn't know the road i would travel with this gun would be littered with the bodies of fallen airgunners There are a good number of people who spend 300 bucks and still dont have this gun just right. I will still build it but at this point a 392 and steroid kit will cost less. I think thats the way i am going to go. 

 

[fishinwrench]

I'm at 455.00 now (if you count the scope) and I am actually ashamed of myself. I could have just bought another P-rod.

To say that it has been more frustration than fun would be an understatement. 

Never again.  

 

[Chichi]

Raden1942 just curious as to how things went with your project?

I'm about to jump into one myself soon.

Any tips for a newb?

Thx Raden1942

 

[AlaskaAirgunner]

Just curious about Raden1942's project as well. I just picked up a 1322 I am going to start modding very soon so this thread caught my attention!