Neale,
good calibre aren't they, I have used the 225 SST's before, but tend to stick with the Sierra's because they shoot a little better. Mine likes RE 19 the best, although looking through my book, RE 15 and AR 2208 were also very good.
I must have a slow barrel, all I can get with the 215/225's is about 2600 or so before the bolt gets a bit hard to lift.
Mines on a Winchester Pre-64 action.

David.