Any of the Premium lines of ammo will do the job. For the .270 I prefer the 130 gr. but that's just personal preferance. It's more than enough to take deer here or any other state. I've been using Federal ballistic Tips, for out of the box ammo with great success on deer. But again any of the types you mentioned will do the job.
As for what shoots best out of you're particular rifle(s)? If you can, get ahold of as many types as you can and see what it likes the best. Some rifles prefer one brand, load, type, to another, so it's kind of trial and error. I have one .270 that loves good old Rem. Core Lock at $8.00 a box. The other won't shoot it worth a darn, so you just have to put it through the paces.
I have had good results with Winchester Power Points. ###Fail Safes are premium bullets, but Power Points have not dissapointed me for a lot less in price. ###As far as grains. ###I would use whatever shoots best in your rifle. ###I guess you can extend this out to brand also. ###Good Luck
What are you going to be hunting with the 243? For coyotes and such, I use a 85 grain BTHP and for deer / antelope is use the 100 grain BTSP. You can get them from PMC, Federal and most other manufactorers.
Bou, or anyone else that sees this first. What exactly is MOA? I see it on my scope "1/4 MOA" I know it means that each click will move the hitting point by 1/4" at 100 yards, but what do the letters stand for?
I think that the 130 grain is by far the most popular round in the .270. I have taken 3 deer with it, and when on loan to my cousin he's shot 3 deer over the years. The heavier boatail rounds have better ballistic qualities but when you can drive standard 130's over 3,000 fps it makes for a pretty potent round. I have used the 130gr. winchester power point(10 bucks at walmart) on 2 deer that dropped dead and reloads on the rest.