there is a big difference between the rounds you have chosen,
--243 is flat, minimum requirement for deer hunt, low recoil, and the cost of ammo is not cheap (about 15-20 per box)
--270 is flatter than 243, good round for even elk, low recoil, cost of ammo is a little higher than the 243
--7mm mag, but I don't recommend this for a begginer round, but its an AMAZING round, flat as hell, hits real hard (will drop an elk @ 400-500 yards with no problems), recoil I would say "mild", its very close to a 30-06 shooting 180-gains(maybe a tad bit more than '06, but nothing too painfull), cost of ammo is.... I order them for about $11.50 a box of Wolf Gold (none of that steel cased crap, this is quality non-russian ammo that Gold bought from..... forgot which european country) but they shoot well, 160-grains at 3050 FPS.... I typically can get 2-3" groups at 300 yards.
--30-30, this round doesn't really mix with the once you have chosen, its kind of like an 7.62X39 (ak-47 ammo), very effective for close range but due to the fact that it has that "rainbow" trajectory, its not considered a long range bullet.
When I first got started in this sport, I had a 30-06 for about 3 years, I shot it about 2-3 times a month with about 60 rounds every time I went to the gun range, and I continue to do so but I have other choices now

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For a begginer rifle / round, I don't think You can go wrong with either a .270, .308 or 30-06, and if your up for some serious shooting, 7mm mag....(my personel advice to you is, get a 30-06).... As far as rifle goes, what kind of budget you looking for ?
I love stainless steel rifles, so all my recommendations for you will be stainless rifles
--$300 , you can't go wrong with howas 1500 lighting (thier stainless steel is nice)
--$500, ruger 77 mk-ii bolt rifles, stainless steel, well built and smooth
--$600-800, I love american made guns, but you CAN NOT go wrong with a Tikka t3 its not american made, but when you shoot one, you'll know you have a seriously accurate rifle in your hands