Wow only the 10th time we have seen this question in the last couple months!
I am slowly understanding why so many guys get pissed and tell others to use the search function.
But I digress. The search function is pretty weak at best.
Sorry for the rant.
To answer your question, I must ask, what could be wrong with them?
Yes they may change your velocity slightly, but just like any other primers they go bang, and are manufactured to pretty much the same specs.
Sellier and Bellot is not new to the ammo manufacturing business, so why not try em out?
Just so you know I have used thousands so I'm not talking out my ass! I bought a #### ton awhile back from a guy at a gunshow when the drought was on, and never had an issue at all, in small or large pistol!