I have noticed that radius on the Dillon dies as well and it makes the resize/deprime much simpler.  RCBS dies seem to catch alot of case mouths, and if you aren't careful, you can ruin some brass very fast that way.  I have to use RCBS dies for a few of my odd ball calibers that Dillon doesn't make dies for, like the 32-20 and 375 SM.  When I load those, I usually go slow and manually tape each case prior to trying to resize so that the case inserts into the die.  I don't like to loose ANY 375 SM brass.

On powders, I find Unique to be a good powder for small cases as it is a bulky flake like powder  and a double charge would easily overflow the case.  Powders like H110 are very fine grained, almost like sand and don't fill the case as much even with a large charge due to the fact that they pack into the case volume very efficiently.  I use a lot of H110 as well as 2400 which is also a fine grained powder.  The watch words with reloading  are always PAY ATTENTION and TAKE YOUR TIME.   A friend of mine has the RL550B and likes it very much.  Sounds like you got a good deal on your outfit, no reason not to enjoy it.  I'd really like to get a second press and keep one set up for small primer and the other for large primer.  That will have to wait for better funding though.

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