Horizontal stringing in non-regulated PCP

[Ribbonstone]

Some pellets more variable than others...but I've found that all of them vary a little bit from year to year/lot to lot.   

Doesn't make a difference to some rifles,  IN others, the small changes do seem to make a difference.


As for fouling...all air guns do to one extent or another. May go a long-long time before the groups open up, may not take all that many shots, but sooner or later it will need  a cleaning.

(So far as I am concerned, bragging about how many years you can go without a barrel cleaning is like bragging about how many months you can go wearing the same drawers befor you get crotch-rot.)

[toddbrat]

Ok, to answer some of the questions:

Typically use CPUM, those are the ones that I've found shoot the best in mine. The absolute best have been the H&N FTT, but the Crosman's are right there with them, at 50 yards maybe 1/8" difference, it really is that close.

I'd love to put it back to stock configuration, however to shroud it, the pickle had to come off. The only that can happen is with a small explosive charge or a Dremel. I used a Dremel. Didn't cut far enough back to get into the barrel, just the plastic around it. I have tried some different pellets during the testing and see the same thing. That leads me to believe it is either in the harmonics or a change in the airflow. Unfortunately I can't test without some type of suppression, the neighbors get a bit jumpy. Even on low power it has a pretty decent 'pop' to it. I am making a standalone LDC to try, been printing baffles all day. Won't have a chance, or decent enough weather, to do anything until Saturday, hoping the wind dies down between now and then.

Also, while I am using the magazine, I've also tried it single shot with the same results. Keep in mind, I don't have the O-ring on my magazine. That alone tightened my groups up since if there is any misalighnment at all, there's nothing putting pressure on the pellet as it is chambered to either dent the head or bend the skirt. Smooth as butter.

[K.O.]

What not worthy is for a while they were selling the Buc barrels as spare parts  it was longer at 18.5"  (good for a few more fpe or effieciency)and threaded 1/2 unf like mine which makes it much easier to make sure the shroud lines up right... but no longer maybe they will bring them back in the future...

going to get a .25 mrod muzzle end shroud support and a .5" diam nylon spacer to stuff it with and then drill and tap... the other end just need to drill out from .5 to size which is just under 9/16...

[mpbby]

I think you should also consider..

https://www.gatewaytoairguns.org/GTA/index.php?topic=72099.0;topicseen