Some thoughts on suppressors...
A 22 can should be your first suppressor. You will use it the most and get the most enjoyment from it. Go thread mount as opposed to integral so you can put it on both rifles and pistols. Buy one that is user serviceable and not made from aluminum. Coat the insides with a silicone grease before first use. This will make cleaning much easier.
CCI Std. velocity is your go to ammo for rifle use. Contrary to what the label says, CCI SV and Subsonic both run at 1050fps. Try other subsonic if you like, but you will come back to CCI for accuracy, consistency, and availability. Buy it by the case in the paper 50 rnd. boxes.
For pistol, as long as the barrel is 5" or less, regular bulk pack will stay subsonic and work just fine.
CF pistol suppressors are more of a novelty than something you will shoot a lot. You will need tall suppressor sights to see over the round cans, or a red dot. Most CF pistol cans are aluminum and not user serviceable. You will want to shoot jacketed or powder coated if you shoot lead.
CF pistol cans are more useful on pistol caliber carbines though. Don't forget the lever guns for some old school cool fun.
Everyone wants to get a can for their AR. A couple of things to remember. 5.56 cans are typically 1-3/8" in diameter so as not to be as muzzle heavy as the 30 cal. cans that are 1-1/2". This reduces internal volume and consequently is a trade off in noise reduction.
Subsonic 5.56 ammo is an elusive beast. I've never shot any, but I've heard it exists but is pricey. A better solution for subsonic with the AR platform is 300 BLK. Get one with pistol gas if you want to shoot subs.
A 30 caliber can should probably be your #2 purchase. It can be used on any caliber smaller than 30 as well.
A CF rifle can is fairly heavy unless you spend the $$ and go Ti. Consequently, you will have to re-zero after installing the can.
A nice plus is recoil reduction. Your 308 will recoil like a 243 when the suppressor is mounted.
For the intrepid Form 1 peeps that want to try their hand at making a 22 can and have the machinery. I have the baffle prints for the first gen SWR Spectre.
And for those wanting to compare cans using real world independent 3rd party test data, look here.
View: https://docs.google.com/spreadsheets/d/1JC_7J7nNUT3LnHkBAf1PXtfJM-IlNVVb2NV_ajU_TiE/edit?gid=441512250#gid=441512250