can a ruger 10/22 be set up to fire cci quiet 750 fps

a little off topic but what the hell it is information I personally learned the hard way.

back from the 90's into the early 2000's, military ranges (at least the ones I was on) only offered the over ear defenders, not the nice new miked ones.

any how,

according to my audiologist, they do not seal properly for people who wear glasses (me), and can move & loose their seal with certain people mixed with certain rifles, do to cheek weld.

I only use foam these days

This is a really, really good point. I recently took my Sub2K to the range with my son, and there were also a couple of range members that wanted to shoot it. Based on the aggressive cheek weld and the stock position, etc. of this thing, it the butt kept bumping onto our over the ears muffs - not just me, but my son and two members of the range as well. Previously I used earplugs, and was surprised by how often I had to adjust the muffs before taking the shot. I think you are probably right in that even with what we would think is satisfactory adjustment, that the muff may not be 100% sealed due to the gun hitting the muff exterior no matter what (we just reduced the degree of the contact with our adjustments). My son and I both wear glasses (not just shooting glasses, but prescription glasses too) and both people who shot the gun also wore prescription glasses.
 
Getting custom ear plugs isn't very difficult. I had some made years ago, as the *POP* of 10m air pistol sessions was bothering my rather sensitive ears. Most competitors didn't wear hearing protection as it's just airgun noise... but it was intense to me, so I went to a hearing aid clinic and had a pair of silicone custom moulds made, then shipped those off to a friend (Plunge Audio in Calgary) who fashioned me a couple of durable urethane pairs of plugs and a pair of active electronic versions with Etymotics tech inside.

Very effective for me, as they go to just past the second bend of my ear canal and thus block all external noise from getting directly to my eardrums. Of course if I open my mouth sound can get in that way, and some sound gets in through the nose, and a fair bit comes in through the skull... but all of this is relatively quiet compared to the direct route. Heck of a lot easier to put in when I'm shooting than rolled up foam, easier to get out too. Very handy for everything up to the 12ga.

My hearing remaining intact is a big part of my ability to earn a living - I need to be able to give accurate feedback to musicians when trying different setups and adjustments, need to hear precisely what a violin, viola, cello, or double bass is doing. I won't be risking my hearing on unprotected shooting, even of the quietest of .22lr.
 
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