Just refurbished a supertarget and the pellets seem to be struggling to make it up the barrel,
New spring fitted with plenty of umph,so New piston seal is working,
I took loading tap/barrel out tried a jsb which dropped into the tap but it’s head was poking out,aha I thought,So I tried a wadcutter which stopped short,put it all back together but same thing happened,1 in 3 would fire ok rest either sticking or chopping,
Being into Muskets I muzzle loaded a 4.5mm lead Gamo ball,this works as I load it with the tap shut so it doesn’t go into the tap.Fires ok lol
I’ve run a cleaning rod down the barrel with the tap shut and can’t seem to find any miss match between barrel and loading tap body.
I’m now thinking if I get a dead size .177 rod to check if there is a slight miss match.Its the only thing I can think of.
Any other ideas?

It’s a webley Mk3 Supertarget