I picked up the H&R single shot 12 ga two years ago after my brother shot his for a year. This gun didnt take to long to sight in and it has been really accurate.
I took two deer with it yesterday 30yrds and 75yrds and I took three with it last year. I have not yet needed a second shot but it is really easy to reload and I had another round in before the deer went down yesterday.
My brother has been shooting the Remington Core Lokt and has like them. I have been shooting the Hornaday SST 300gr rounds.
I think it is a good price for the gun and I have not heard about acuracy issues with the H&R.