I have used 350s with blue dot...man does that sound like dirty harry's .44 or WHAT!!!
(also - check out the fireball at the end of the pistol in my avatar - 155gr.xtp+max blue dot + #350s = (3) hairline case fractures (similes) that day (3 out of 30)...wished I would have chrono'd that batch.
Oh well, too busy hunting for that now! - but maybe later - I still have a whole lot of blue dot left.
In the old speer reloading manual I have, some loads are shown with #350s and some with #300s. I am almost positive that AA#9 is the only powder where 350s were part of the protocol - other powders just used #300s. At that point there was no mention of 800x in the manual for 10mm.
I have never found a bad batch of any brand centerfire primers (I'm sure they are out there somewhere), but I am of the opinion that the #350s push 800x loads faster, and that is primarily why I use them.