JSB King Heavy and LW poly choked barrel

Look for my post at 100 yards recently. Shot in the low .4’s to high .3’s with that barrel at 930 fps with the mk2’s. Zero luck with slugs however. So that combo worked good for me.

My RAW lights out shooting the original MK, and not much different with the MK2's out to 100 yards ( I have not tried shooting it to any further distance). I have tried several different slugs recommended by Pros, vendor/manufacturers, and AGN members and none of them are as consistently accurate as the King Heavy pellet series. I am pushing the 33.95 Gr pellets at an average of 868 fps.

Ive got every bit of 1500 pellets down the barrel, havent cleaned once, never lubed either. Only thing i did when i first got it was gave it a good cleaning followed by a decent session with jb.

Yes mines choked, pretty tight too. Its hard to tell but looks just like some lead fouling no?

Im actually pulling the barrel this weekend so ill be sure to snap a few

Well I can tell you even if its fouled, ive yet to see a decline in accuracy, this barrels a shooter. Even pushing 25gr jsb’s well over 1000fps its still accurate. I pushed the 34gr to 1040fps with still no accuracy loss but shot count wasnt what I wanted. Are you seeing or having trouble finding accuracy?

Hi storm.sunny , I just achieved the installation of a Lothar Walther polygonal barrel on my .25 Cricket. This was a "gunsmithing exercice" for me , because I started from a LW barrel blank , so a lot of accurate operations were needed to adapt it to the Cricket. Thanks to the precious advices of @Long-shot , I finally made it and after some tuning , results were pretty good. As I said , this was a kind of a challenge for me , not a trial to make the gun shoot better than before with its CZ barrel. Here is a pic of 6 shots at 50 yards. With more testing , I think it could be improved.

Mike

Accuracy started falling off right after I tried a different slug. Looks like the slugs fouled it out. I went from easy .500” groups at 75 yards to 2”



its hard to see, but it is similar to yours. 

Looking at the pic's these poly barrel look more like the old style BSA barrels with the convex shaped lands. They don't really look like a true poly bore at all. Odd!



Take a look in a search of poly bores. Glock is a start. The stx barrels from fx look far ore like a poly bore than theses L/w's. 



I do know that JSAR wanted to use the l/W Poly's in some of their Raptors. They were far too inconsistent and were skipped. 



Knife

I really cant complain, the lw barrel has been really good to me. I just need to give up on slugs however. It just lead fouls it almost instantly and the accuracy is terrible. But tin after tin of jsb’s its very consistent! Stormy, are you only shooting pellets or are you shooting slugs too?

Oh and knifemaker your right I looked into some other poly barrels, its like the lothar barrels did some kind of hybrid haha