Take a look at the Pew Science ratings, and sort for the firearms most similar to what you have. Then find the sweet spot between noise reduction and length/weight. There are so many different manufacturers these days, and for the most part they are all making the same copies of one another...or the guys who have been in the game for a long time.
For a few pointers to help steer you, for a lightweight hunting rifle, go ahead and cross anything off the list that is 8-9 inches long and over 10 ounces. It's just physics that the longer cans are also the quietest, but your stated application of keeping your lightweight hunting rifle true to form, you want to stick with something in the 7" range and lightweight. Luckily we now have quite a few choices in this area to include the tried and true Thunderbeast, Otter Creek, Diligent Defense,
A few cans that aren't tested by Pew, but are subjectively very good for the size profile (I cannot personally attest to this) are UM's OG and Reaper cans. I can say that everything they make which I've bought is top-rate.
Likewise, as a general rule don't go below 6" for a full sized PRC round, as it's gonna suck to shoot.
Something to consider, for hunting I like to tape my muzzle end to keep crap out of it...a lot of silencer companies like to put spikey front end caps on their cans to make them look scarier or something...which poses a bit of a problem if you do the same.
For an AR, if you can swing it, I'd definitely recommend one of the low backpressure cans like the Otter Creek Infinity (or wait for their Infinity 556k that is coming out) or a CAT 5.56 can. It will definitely make the rifle nicer to shoot without having to worry about affecting your cycling, though they often come with a weight penalty due to all of the air flow structure on the interior, as well as materials (often Inconel vs titanium for heat resistance and reduced sparking due to the much larger overall surface area on the can interior structures.)
As for your 223 bolt gun, if you are wanting to buy each can for each rifle, then there are a few dedicated 6mm cans that work well and are sized more appropriately for smaller calibers. Otherwise you can simply use the 7mm can, OR you can use the can you buy for your AR. Mine wears a Diligent Defense Wolf Hunter and I love it, but there are a few competing options as well.
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