I have a Lyman flinty like yours, except in .45 caliber and 3 F will work but when you finally get some 4 F and use it you will NEVER go back. It's virtually instant, perfect ignition EVERY time. I can get by with 3F but occasionally it's a bit slow or sometimes I have a failure to fire and have to recock and shoot. I have yet to have 4F fail to fire ever. It definitely is the way to go.
Al



























