Buy all you can of both.....
I wouldn't turn down any SR primers at this time, if the price is decent.
Use the softer primer ( thinner cup ) for moderate loads in your .204 ( low - mid 3k ) and match primers for the max loads.
Here's some good primer info:
http://www.jamescalhoon.com/primers_and_pressure.php yeah right now, I didn't know many folks had the luxury to be picky...
I have plenty of small rifle primers but have been using small pistol primers in my 223 loads, just to conserve the small rifle primers, in case this Obama induced primer shortages is going to last longer than we all thought...
