Took a pic next to a box of .22 ammo, and the weight is 450 grams. Length would be aound 230mm and diameter 35mm. Pic quality not the best, taken with phone.
This one is for .243, but we've done them in .223, .260, and .308 so far...will try to test on .270 sometime next week.
No decibel test done, but compared it with most on the market and it pisses all over anything else I've tried.