I've got this 112 J in 220S that I've had for maybe 20 years bought used. Walnut stock, clean. Been using it lately and notice that once in a while after I close the bolt, the trigger doesn't work. I'm thinking the firing pin has already been released because I have to re-cock it. Trigger is set very light so no surprise. What do I have to do to get rid of this issue? Luckily nothing has gone off during loading and there haven't been any slam fires.

How do I check the throat of this rifle for erosion?

Hornady 55gr V-Max factory ammo seem to shoot pretty good at 3550fps on the chronotach. But I'm not getting good ES or SD with 3031 or 4895 reloads at that velocity. Any better ideas?