"...or POF junk..." Not all POF ammo is junk. There were some years that were ok. Don't remember which years. Most is unreliable though.
"...Wolf bimetal cased .303..." Isn't surplus.
"...bimetal cases worked well..." That has nothing to do with difficult bolt uplift or sticky extraction.
The DDNP primer scare doesn't apply to .303 British. No such thing as .303 British NATO ammo.