Some things you will want to consider are what gun and what you are looking for from the can (max sound reduction, ease of switching guns, size, weight, ease of cleaning, what calibers it will work with, min barrel length rating, etc).
For rimfire, ease of cleaning is very important.
For centerfire, you may want to consider a .30cal can (potentially one with multiple end caps for different calibers). Especially with some of the QD mounts, you can swap the can between multiple guns easily.
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