One of the perils of a thread asking for the best ammo for a given for any .22LR firearm, a CZ 455 in this case, is that there is no right answer. So far there have been suggestions recommending a dozen or more different but specific varieties of ammo, among them Federal Match, Eley Match, Center X, CCI SV, CCI Green Tag, Federal Auto Match, Midas +, SK Standard Plus, SK Rifle Match, SK Magazine, SK Pistol Match, SK Flatnose Match, and RWS Target Rifle. Not only that but recommendations have included the more general Eley, SK, Lapua, CCI, and RWS -- which is much the same as saying the best car for driving on the highway is a Ford or a Kia or a Volkswagen.
Until the OP revealed something about what he wanted to do and what he was willing to pay for it in post #15 above, horseman2 offered the best advice in post #14.
I don't think you are paying $28 for a box of 50 at Cabelas for any "Federal Match" ammo. Which one is it?
Federal Match for about $14.98 at Cabelas online

Federal BYOB for about $27.99 at Cabelas online

Federal Champion for about $5.99 at Cabelas online

It's unlikely it's the first one, the Federal Match, as it is well above the budget target of $5-$10 per box.
If it's the second one, you can do better. If it's the third, maybe it's good despite being high velocity ammo. But again you can do better.
For best chances of accuracy, don't use either bulk ammo or North American-made high velocity ammo. Standard velocity (under 1100 fps) will give the best chance for accuracy. Try what is readily available. Many shooters are satisfied with the accuracy and consistency provided by CCI SV ammo. It's not the most accurate or consistent (it may have frequent fliers compared to the really expensive stuff), but the price is attractive.
Probably even better would be SK Magazine, which is available for $65 for a container of 500 rounds. But it's unlikely to be found at many local establishments and you'd have to pay for shipping, which for some shooters can be a deal breaker.
There are other ammos that merit recommendation, but before making any, it would "help us help you" (to borrow from horseman2) if we knew how much ammo you were thinking of getting and if you are willing to pay shipping costs for the best ammo for a CZ 455. To put this another way, if you're looking for the best ammo that's available, say a brick or two's worth, without ordering a larger quantity it would be good to know. If you want only a brick or two, it might be best to buy CCI SV locally
Until the OP revealed something about what he wanted to do and what he was willing to pay for it in post #15 above, horseman2 offered the best advice in post #14.
"Likes" does not define a level of accuracy.
A five shot group is good; five 5-shot groups is better; five 10-shot groups is best. Which one would appear to have the greatest reliability?
Where you would like to be at would help us help you.
$5 a box ammo might work but CCI SV lacks consistency. When you find some that works to your satisfaction then buy a goodly supply.
Keep in mind the lot number on CCI SV only means something to the manufacturer.
There are suppliers that will assist you in testing ammunition and may be able to keep sufficient amounts when you do your testing quickly . . . maybe two weeks.
Hello,
I’m in Calgary. I may be wanting the impossible, but ideally I’d like to find reasonable ammo ($5-10/box) to shoot gophers with, and match ammo with the same velocity for shooting at the range with when I want pretty groups. I read CCI standard and Green line will do this, so just ordered some. So far Federal match has shot best out of my rifle, and was most consistent on the chronograph. It is $28/box of 50 at our local Cabelas. If I could find cheaper gopher ammo that shot similar, I’d be really happy!
I don't think you are paying $28 for a box of 50 at Cabelas for any "Federal Match" ammo. Which one is it?
Federal Match for about $14.98 at Cabelas online

Federal BYOB for about $27.99 at Cabelas online

Federal Champion for about $5.99 at Cabelas online

It's unlikely it's the first one, the Federal Match, as it is well above the budget target of $5-$10 per box.
If it's the second one, you can do better. If it's the third, maybe it's good despite being high velocity ammo. But again you can do better.
For best chances of accuracy, don't use either bulk ammo or North American-made high velocity ammo. Standard velocity (under 1100 fps) will give the best chance for accuracy. Try what is readily available. Many shooters are satisfied with the accuracy and consistency provided by CCI SV ammo. It's not the most accurate or consistent (it may have frequent fliers compared to the really expensive stuff), but the price is attractive.
Probably even better would be SK Magazine, which is available for $65 for a container of 500 rounds. But it's unlikely to be found at many local establishments and you'd have to pay for shipping, which for some shooters can be a deal breaker.
There are other ammos that merit recommendation, but before making any, it would "help us help you" (to borrow from horseman2) if we knew how much ammo you were thinking of getting and if you are willing to pay shipping costs for the best ammo for a CZ 455. To put this another way, if you're looking for the best ammo that's available, say a brick or two's worth, without ordering a larger quantity it would be good to know. If you want only a brick or two, it might be best to buy CCI SV locally