On Saturday I took the 15-22 to the range in preparation for a competition this weekend. I cleaned the rifle by the usual disassembly. The session went well but at the end, after 100 or so shots, the rifle had 3 failures to fire. When I retrieves the rounds, each had a mark where expected at the rim, but on inspection the mark rubbed off with my finger. No metallic strike at all. Each of the 3 round fired second time. It will be Wednesday before I can get the rifle to the bench, don’t ask, and a quick glance showed the bolt face very dirty. Could the bolt of the 15-22 be so dirty after 100 rounds of Aquila lead 40gn?