Weihrauch HW100 T has become completely inaccurate

[Chalkie]

I am from the other side AGF, been dipping in and out following this. l have joined the forum to offer my take. I have not read all the thread so apologies if someone has already covered this
I purchase a HW100 KT about 3 years ago and l was never happy with its grouping. I tried all the the things other members have mentioned, as a last resort l purchased a new barrel vowing if that didn't work l'd take up crown green bowls.
Well it didn't work
Try this...load a felt, remove the moderator and spray WD40 down the muzzle end. The felt will stop the WD entering the internals. Fire the gun
Place about 100 pellets in a tin add a few drops of light oil. Anything will do for now. Try the grouping
Worked for me, my take is that a PCP needs lube in the barrel, pellets alone do not provide sufficient lube
If it works or improves then try different lubes until you find one that groups the best
Mine 20 mm spinners 50 yds 8/10 times. Simple but it worked for me. Best performing pellet JSB Heavy