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So I am not sure if this belongs here or in the gunsmithing forum. So my enfield at the range the other day had some issue with miss fires. Now I was shooting Brown bear that was pretty old from the looks of it, so hearing that the range master said that the problem might be the ammo. But I got home and I looked at the rounds and they all had what looked like light strikes on the primers so I'm thinking that the problem may be that I need to take the bolt apart and give it a good cleaning.
Cleaning and lubrication is the logical first step. If you have the means to do so, check the firing pin protrusion and the striker spring weight. Protrusion should be .040" - .050" and it should take 13-16lbs. to pull the cocking piece back to the full cock position.
As Steve said ... check all is as it should be before firing the rifle again with different ammo.
When you have what you think is a light strike...or maybe the ammo is punk, at least pull the cocking piece back and try it again. You don't have to open the bolt to do it so quite safe... I'd want to see if they were showing light or if the second strike fired them...
Agree with BAR on that try it again, I turn green when I see guys have mis-fires and straight away open the bolt or re-cock the rifle with out waiting the mandatory 30 seconds without re-cocking always keeping the weapon safely pointed down the range.
Could be build up of crud inside the bolt plus the main spring may have lost tension over the years just gradually getting weaker until it wont fire the weapon, I always de-cock all my bolts then put them in separate pencil case holders.