Just to add, I had been experiencing misfeeds, and noticed the lips of the maple leaf bucking which had been fitted recently were protruding into the feed chamber, I cut them back (badly), and the fees issue seems to be resolved, however I now have an increase in power - the opposite of what I was expecting, with 350fps over 2j with the M130. Have ordered a new bucking to cut down cleaner, but I can't understand where the increase in power has come from