I have an old mini14 and the best ive done is 5 shots, 2 1/2'' at 50 yards with handloads which is terrible. I heard the new ones are better, does anyone know why?
That sounds about average for a mini 14. That's about what mine does as well. It seems to be indifferent as to what ammo I feed it as well. There are several reasons for this. The Mini 14 is built to be rugged, durable, and inexpensive. First and foremost is the gas system - it features a heavy self cleaning piston system, which adds a fair amount of weight in moving parts. Also, the gas system is ported to allow the use of a generous amount of gas. This keeps the rifle operating even when its cold or dirty, but it jarrs the rifle pretty good when it slaps the bolt back and forth. The barrel profile is fairly light to aid in heat disspation also good for heavy use, and bad for accuracy. Finally the trigger is fairly heavy and requires a concerted effort to pull without moving you off target. That being said, (regardless of varying opinion) mini-14's are extremely reliable.
In order to fix the accuracy issue, ruger made some changes to the new model. The barrel is a heavier profile, and the rifle is made with tighter tolerances overall. I think they claim it will shoot 2 MOA now. The new target model can supposedly shoot under 1 MOA. To do this, they went all out - bull barrel, tuneable gas system, heavy muzzle brake, etc. Unfortunately the darn thing weighs half a metric ton.
Anyway it all boils down to what you want. If accuracy, you may want to consider another option like an AR, or as SHOOTALL loves to suggest, an M1A (even though theyre part korean and part brazillian). Any of these pattern rifles are good rifles if you know their strengths and weaknesses, and I certainly wouldnt worry about part replacement - unless you're a high volume shooter and burn 10k+ rounds every year.