I bought a 100ATR in .30-06 from the World of Wally back in March of 2008, before the fluted barrels and adjustable trigger, and it's been a fine rifle for $249 otd. I started out shooting it with cheap(ish) Remington Core-Lokt 150gr PSP from the same place, and always hit what I was aiming at. As I got a bit better at shooting, I mounted a better scope and started handloading, and my groups shrunk a little bit and now hover right around 1"/100yds (1.5 is common, since I'm not very good anymore). I've tweaked my loads to shoot better since then, but I'm just not that consistent of a marksman these days (fell out of practice due to school).
The rifle is ugly. I was gonna replace it, but after seeing it shoot so well and knowing it isn't worth much in resale value, I decided I couldn't sell it.
The rifle itself is built decently. The barrel is of a very thin profile, making it susceptible to shots wandering as it heats up, but many low-end rifles can have this issue and with a short period of cooling during your shot string, it's really not an issue.
The stock on mine is the black synthetic, which flexes a good bit but seems to do the job well enough (the flex might have some affect on the shots wandering); when I bought the rifle, the mold lines around the stock needed smoothing out, but some high-grit sandpaper took care of that.
The sling studs are molded into the stock on the synthetic version, and while they are plenty tough enough for a handy-sling, they are definitely not tough enough for mounting a bipod. Yes, mine broke, but the Uncle Mike's I used to replace it has held up nicely over the last couple years.
The trigger is a bit heavy for my liking, and has just a hair of take-up to it (almost like it's trying to be a two-stage trigger, but not quite making it). But it breaks clean and consistent, and despite the weight it feels good to shoot.
The bolt is what a lot of guys are leery of, but it is built solidly and has stood up to several hundred rounds-- and me whacking on it when I was learning how NOT to use neck-sized brass from another rifle
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Now, all of that said, while it's a good rifle for the money and I wouldn't trade mine away anytime soon, I suggest you keep in mind other options within a day's wages of the Mossy. Since Mossberg added the extra options of barrel fluting and adjustable trigger, it's an even better value than when I bought mine, but do yourself a favor and check on a Marlin XL/XS 7 and a Savage Axis and/or 110. When it comes down to it, whichever rifle is in your price range and feels like "your rifle" is the one you ought to get.
Last note:
http://www.midwayusa.com/product/22...e-scope-3-9x-40mm-dead-hold-bdc-reticle-matte
http://www.midwayusa.com/product/14...-scope-4-12x-40mm-dead-hold-bdc-reticle-matte
Vortex has some great glass and good prices.