- So no supersonic guns.
- In the UK world of 12 ft/lb hunting rifles, the max velocities depending on real results, were around 800 fps in .17, and 600 in .22. Early on, coincident with most guns being springers, and later gas ram, the .22 was the pet. My experience with those back in the day was that I couldn't have told whether I was shooting a silenced rifle or not. I don't doubt I could have told had someone been shooting at me, but from the shooter perspective I saw little difference. It actually takes a fairly significant increase in volume for the human ear to tell that a volume increase has occurred, which may be why db is a logarithmic scale. You can buy actual db meters on ebay for around 20 bucks. With springers, the spring was normally noisier that shooter side muzzle blast. The point of having a silencer was to make it possible to take repeated shots in situations where multiple quarry were present as the game was often of a type where many targets were available, unlike at least the shooting I see over here. With PCP various cans and shrouds have a marked effect. I did wonder though, when shooting at something like doves, or rabbits, just how less startling a silenced rifle was.
- So basically if you want a really quiet gun one of the first things you can do is get a low velocity model. That will make things nice and British for you. Sadly the sub PAL models are not powerful enough for my taste, but going for everything you can get will get you a noisy gun, and often not an easy to shoot one with springers.
- If your main objective is to stop quarry hearing you, you can try a muzzle brake, these do not reduce noise overall, but may reduce noise to the quarry.
- More quality seems quieter, I haven't heard a new Weihrauch, but mine were fine. I also prefer gas ram, but must say I really only know the Theoben. I think gas ram is quieter because there is less rattle of the spring, but also because they never seem to diesel, but that may not be true of all, depending on piston and plunger and many other things.
- longer barrels may help.
- If I wanted a reasonably cheap gun, I might try a Crossman Trail that is not too souped up, in .22. I'm guessing same piston stroke length, mostly, larger hole to swallow the gas.
- I would also look at muzzle brake design that some models come with. Some of these, even those with an enlarged hole, and obviously no baffles, still contain the bloom at the muzzle. Study available MBs, as they may not all be the same relative to whatever it is you want (quarry, range noise, shooter's ears, etc...)
- Speaking of what you want, depending on what you most want to be quieted, you may need to consider the impact noise on target of various pellets and calibers.