Those figures are barely useable as rough estimates if that much. In most cases, the figures you will find are pretty much useless.
The sound level will vary greatly depending on your angle from the muzzle. The sound level at different angles will vary depending on the thing on the end of the barrel. Plain nose, muzzle brake, flash suppressor, or sound suppressor. It will vary depending on the length of the barrel. It will depend on the type of powder and weight of bullet. It will depend on the action of the gun in question.
The only thing that irritates me about all the DB ratings I have dug up is they all reference a spot one meter to the side of the muzzle.
That is fine and dandy in regard to picking appropriate hearing protection for your buddy that is watching you shoot. But it is about useless for figuring out how loud it is for the shooter, or how loud it is down range..
For a plain nosed rifle, anyone that has stood at a distance as a spectator knows that if you stand to the side, or forward of the muzzle, it will be far louder than if you even take a few steps back to stand somewhat behind the shooter.
I had situations where I was standing about 30 feet to the side of person firing a weapon. I may have been a few feet forward of his position. When he let off that first shot you could feel it in your chest, and ears. I took about 4 or 5 steps back but still about the same distance from the gun, and the next couple rounds didn’t bother me at all while I was dragging out my hearing protection. With that particular gun. It was quieter when I was standing right behind the shooter than when I was 30 feet away and to the side of the muzzle.
Some guns are far louder at the shooters ears than other because of gas blowback systems and the like. Bolt, pump, lever, and break action guns are generally the quietest for the shooter.
It also seems like the ratio of sound projected downrange verses the amount that comes back to the shooter depends on the particular ammo you use. I have ammo that I don’t mind using in a bolt action without hearing protection when the need arises. With other ammo in the same gun, it would be less painful if you just let the wild animal eat you, if you had to shoot it without hearing protection.
Now for my personal opinion on gun sound, which I know will go against the grain to a lot of people on this board, but it’s my opinion none the less.
……. Start rant…….
Carbines can be real obnoxious depending on the ammo you feed them. That is why I don’t like AR style guns with 16 inch barrels, or any gun with a short barrel for that mater. To me, they are basically are unusable without hearing protection with almost any ammo I have found. What the heck is the point of having something if you can’t use it if you can’t find the dang ear plugs when you need to use it at a moment’s notice? That is why I don’t have much use for handguns. They are all loud in comparison to the knock down power. They have their niche but I will avoid that niche as much as possible. Don’t even talk about a mosin carbine. Do not even dare to fire one without hearing protection. Evidently the ruskies though hearing was an unneeded capability for their troops.
Muzzle brakes are always obnoxious as for as sound level at the shooter’s ear goes. I would rather have a broken shoulder bone than have to put up with one of those things any day.
One thing that has always puzzled me with people practicing using their weapons for self defense, and never firing the thing without hearing protection while practicing. The worst time to be intimidated by the weapon you are using to fend off a wild animal or bad guy is when your life depends on it. If the blast from the weapon is so loud that when you hear it without protection the first time, that it makes you hesitate firing the follow up shots, then it is almost worse than no weapon at all.
You have to be fully aware of what you will experience when you are forced to use that weapon without the luxury of hearing protection when that life or death situation arises.
If the weapon you want to use will make you death from one shot without hearing protection, then throw the damn thing away, and get something that is more danger to your attacker than you.
…… end of rant…….