look back a page or two for the dp73 thread. couple of us have used the powder and posted chrono results. I bought 32 lbs of it and have loaded just shy of half of it now, and shot a good bit of it.
I'm planning to buy some more.
btw, i bought 40 lbs of 2230-c years ago and still have a jug left. I like that powder a lot too, for what it is.
If I had to choose between the two, I'd go with the cheaper (currently 73). If they were the same price, I'd probably pick 73. keep in mind though that 73 is fixed supply and when it's gone, there won't be any more. So, if you were looking for a load to use for years and years, go with the 2230-c.