That's a tough question to answer. Just about all .22's are fussy about what ammo they like to eat. Your best bet is to just try different brands and your MK III will tell what it likes best. I have very good luck with Federal bulk ammo. 36 gn. hollow points. Very few flyers and hardly any duds. That being said, yours may not like Federals at all. But that's half the fun, getting out and shooting a lot all sorts of different ammo.
As Doc said, you should try a few brands to find out what your MKIII likes best (as well as what price best fits your wallet). I personally shoot Federal bulk most of the time for plinking and CCI if I want something a bit more accurate (my MKIII hates the Remington bulk). Good luck finding what's best for you.
I broke mine in with CCI mini-mags. After a few hundred rounds it'll feed anything. CCI Blazer are a decently accurate but a bit dirty.I plink with Fed bulk, Win bulk, CCI blazer, mini-mags, Fed automatch, Wildcats. For target practice I use CCI SV, Wolf MT, and Fed 510.
Both my MKIII's will eat whatever I feed it, but I broke it in with Aguila SuperMax. My MKIII Hunter is what I hunt with and I use the Aguila SuperExtra 36gr HP in it without any problems. With my MKIII 512 SS 5.5 I use CCI Blazers and Fed Bulk and again without any problems. If you plan on hunting with your MKIII I think that the sub-sonic ammo would be best, that's what I plan on changing to.
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