It seems to me, based on some comments, that as a hunter, not a plinker, I really don't need one. I was concerned about noise for my boy. Maybe that's not even an issue...
I hope to...teach my kid how to hunt without killing his ears. I thought that a suppressor my be nice in a 17 HMR, but I have zero experience with them. ... How much different is the noise between the two? Do I even need to worry about the noise of a 17 HMR?
What about a non suppressed 22 vs a non suppressed 17 HMR? I had zero intention in suppressing his 22. It's super quiet (as compared to what we're used to...centerfire rifles). ... the intention is to always protect his ears. I've never wore ear protection, except when practicing, never in the woods... But I'd have no issue with a 22 ever. Is a 17 HMR much louder than a 22? As a dad, will I notice that difference so much that I'm worried about his ears?
You are wise to be concerned about your son's hearing.
Shooting a 22 LR unsuppressed will contribute to hearing loss. Hearing loss is cumulative and irreversible. The louder the sound, the shorter the duration of exposure required to cause hearing damage. For example: At 140+ dB hearing is damaged instantly; whereas one can be exposed to 85 dB for 8 hours in a day before hearing damage occurs. This is why hearing protection is required in many industrial environments - I've been there, I'm there now.
The American Suppressor Association has a lot of good info. For example:
You can find this all backed up by OSHA and medical studies...
Just because a 22 LR shooting SV ammo out of a 16 barrel produces ~140+ dB of sound doesn't mean that the shooter's ears - yours and your son's - aren't being harmed. There isn't any reality in 'we're used to shooting CF rifles that are much louder' (which, by the way, usually produce ~167 dB of sound) - its harmful. The damage is done.
The 17 HMR is louder than the 22 LR unsuppressed. It's louder suppressed, too, using most all rimfire suppressors. But 17 HMR suppressed is brought to hearing safe levels in the 125 dB range, whereas 22 LR can be made stupid quiet, 115+/- dB, as others have pointed out. Suppressed CF rifles are often only brought down to 135 - 140 dB. At those levels, harm can still be caused, and repeat use may warrant additional hearing protection.
I recommend getting two "cans," one for each of you. Most all modern rimfire suppressors will handle the WMR and HMR cartridges, and are going to provide reasonable to great suppression. Really, we're getting to the point of splitting hairs. Pick one or two that have features you like and go for it.
Else, put the muffs on or the plugs in and save his hearing. Electronic muffs are nice because, like with a suppressor, one can still hear their surroundings - it's just not the same, though.
JMK
PS - the best time to buy a suppressor is always 6 months ago.
