The bigger the calibre the less power the spring or ram needs to make to get it to 12 ft/lbs . So if you down size it from .25 you'll get even less power. This is because power is to do with muzzle velocity and the weight of the pellet, the velocity needs to go up for the smaller calibres, which requires more from a ram or spring.
If it's a rammer & down on power then the gas ram needs more air in it, for which you'll need a "Slim Jim" pump kit from Best Fittings, but that will cost more than twice a spring & delrin guide kit, that is you don't need a new piston.
I've got a Welsh Willy kit in one of my rifles & a TBT kit in another, both a big improvement over standard, but the WW Dagda spring does seem less harsh than the Weihrauch one.
You'll probably have to size the spring to suit the calibre, esp for .25 as may need a coil or so removing. It's not hard but you need a blowtorch to collapse the end of the spring & something to dress the cut end like an angle grinder.
The other possibility is that the piston seal and or breech seal(s) are shot.
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Originally Posted by steviebee
