Model 64 Misfires?

I have been getting quite a few misfires on several different types of ammo
Ammo used have been
CCI
Remington Golden Bullet
Federal bulk Blue box
American Eagle 38 gr HP
Federal Auto Match 40 gr solid
I am just wondering if something could be wrong with the firing pin, it seems at times it's not going into battery completely.
Also I have noticed that when charging the rifle to load it getting a positive grip on that tiny bolt handle is almost impossible for me with my large hands. I have been looking into a larger charging handle for it but the only place that sells them have been out of stock for some time.

Thanks for all replies. I am also wondering if it could be a magazine issue, next time it happens I am going to mark the mag, I have 3 mags for it. I have also noticed that the original mag that came with the rifle is designed different than the other 2 I purchased.

sounds like maybe the screw at the end of your bolt isn't tight.I had that happen twice on my 110 model

My 64 starts to misfire when firing pin channel gets dirty. If firing pin is not sliding smoothly in channel, it'll make light strikes.

I took both advice check on both areas on the last cleaning. I did notice when lubing I changed on where & how much lube to use. I went out shot 100 rounds of Winchester Super X shot all 100 without a issue. Thanks for the feedback.