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DonnyFL Emperor V3 problem

I buy 308 and .357 calibers and use them in .22, will the effect be good?

The level of moderation won't be quite as much as if you got the .22 version, but I always buy .25/.30 to put on my .177/.22 since it's more versatile should I get a .25 later and there's less chance of the pellet clipping the insides of the moderator.
 
The other difference is the bore size is larger. I just bought koi for .177 and it has bore of 0.30 inch. I have alan Z moderator for .177 and bore on it is 0.20. It's quieter, but not that much. I have had problems with pellet clipping with small bore diameters.

FYI. If you have 10m gun with bloop tube end and 20mm dia barrel, you can make a very effective moderator with 10 gauge shotgun hull. Decap and cut off crimp. Push on barrel and tape.