im in the market for a USED 270
which gun is the most reliable

Too many guns perform well. What're you looking for in a gun? Remington 700, Winchester 70, Kimber 84xx, Savage 111/110, Tikka T3, T/C Icon/Venture/Encore, Ruger 77, Stevens 200--the list rolls on.

Big Z is right,lets narrow it down a little bit though,what kind o 270 do you want,bolt,auto,lever,pump,single shot??

browning abolt medalion. always

I had one of these in .280, it was an aweful purty gun but man that soft wood sure did dent easy. I was offered a nice chunk of change for it and decided to sell before I ruined the thing hunting. Heck of shooter too.

i have a ruger77 very accurate gun... it is 20 years old.. has had prob 150 rounds shot through it.. it still is very accurate and a very reliable gun.. won't cost as much as a browning but a little more pricy than a few of the others

Look for a SAVAGE 110 with accu-trigger. I pick one cheap in a pawn shop last year after deer season. Its a good place to start and check local paper.

a bolt action would be nice
i need accuracy and reliability
i have to buy it myself so im in a very limited budget

First thing I would tell you is don't be hung up on finding only a .270 Winchester. Be open to other chamberings like 30-06, .308, 7mm-08, 25-06, .280 etc... This will allow you to have many more firearms to choose from and the difference in performance in any of these cartridges will be minimal.

Second thing is don't worry too much what the stock looks like. If it is scratched all to hell but not cracked or broken in any way this is a plus for you as it will drive down the price of the firearm and you can refinish or replace it later. Just make sure that the barrel is in good shape and everything functions like it should and there is no rust pitting. A little surface rust is no big deal as it is easily removed and will drive down the price for you as well. Make sure to take it out of the stock and look at what you can't see.

If you find one in a pawn shop never never never ever pay what they are asking for it.

I would look in your local classifieds, gunsamerica.com, auctionarms.com, gunbroker.com, flea markets, garage sales, estate sales.

Best advice is find one that fits you and not someone else's opinion. Everyone is different.
You can usually spot a good used rifle on the shelf. Its the one that has been taken care of. You may find the usual handling marks, dings in the stock etc. but the bore and metal are clean.
But be forwarned. These may be on the rack because they couldn't shoot well and you may have to invest in some gunsmith work like trigger job, bedding etc.