Hi

No, afraid not, this is my 1st 22.250.

However before I decided what powders etc to select, I referred to an American guy called Steve - he appears to have shot just about every calibre you can think of - the arch duke of anoraks!! However I have emailed him a few times and can honestly say he is one good guy.

If you have hours to spend his web site is well worth a read - he is very thorough. If you look at the following page of his and click on .224 you will will then see (amongst many) 22.250 rem which will perhaps give you some ideas.
But do take the time to read all his blurb - he has got humour with it!!

http://stevespages.com/page8a.htm

Peter