Of course it was not me but a competent gunsmith.
Misfires: just removed the hammer extension spur. It seems that it afected speed in some way. As long as I can mount the hammer without that accesory, Iīm fine. I could fire all the rounds that previously couldnīt.
Accuracy: Apparently the barrell/action fitting had some looseness even with the action closed. That made that in every shot made, that looseness affected accuracy of course. What the gunsmith did was giving a very slight curvature, almost invisible, to the pin that attaches the barrell to the action in order to give some backwards preassure to the barrell. That preassure produced then a perfect match between the barrell and the action. Now there is no more barrell movement and the .308 loads that previusly grouped in more than 5 inches at 150 metres, now make beautyfull inch and a half groups. The load is 41.5 grains of 3031 pushing a 165 grains corelockt.
Saludos for everybody.
Diego Naveira