Is wssm brass still readily available?
No, loaded ammo and component brass are irregular/seasonal production runs at Winchester/Olin. Component brass by other manufacturers might be run in small lots, but I haven't heard of any.
If you're going to shoot a WSSM, you'd better be prepared to buy loaded ammo and component brass whenever, wherever, and a whatever cost you find it.
I jumped into the 25 WSSM pool with both feet in 2004/2005, so when Grafs put Federal 223 and 243 WSSM brass on sale, I bought several thousand pieces.
I have had great success with the thinner Federal brass, all of it resized to 25 WSSM and some of which I have loaded 8x. The Winchester/Olin brass is very thick and tends to get split necks if you don't anneal it.
EDIT: It has been pointed out to me that Hornady is making 243 WSSM brass and that MidwayUSA has it in stock priced at a little over $1 per piece of brass.
