smellie
ALWAYS lube the insides of case-necks on .303 brass when resizing.
Dear smellie
I'm not as old as you are at 60 but you can teach an "OLD" dog new tricks.
You do not need to lube the necks on your cases if you use a Lee Collet die and a even better reason is your cases will have much less runout or have much better accuracy. (the mandrel floats and can't push/pull the neck off center)
A .303 case forming and trim die can be used as a shoulder bump die to just push the shoulder back when needed.
(NOTE: the fired case was inserted with just my fingers and in the bottom photo the case shoulder is touching the shoulder of the die)
smellie
BEST BET:
(1) use Ed's O-rings on first firing.
Its not Eds O-ring trick, this information was taught to me by a Canadian after a riot at a Hockey game.

(TerryinVictoria in the old Jouster Enfield forum)
IMPORTANT NOTE: lube the locking lugs when using the o-ring to fireform your cases to help prevent wear on the locking lugs. (there will be more force on the bolt face and bolt lugs than normal)
And last but not least, I NEVER have case head separations because I check each case after firing for thinning in the web.
"Stuck case remover? We ain't got no stuck case remover. We don't need no stuck case remover! I don't have to show you no stinkin' stuck case remover!"
The Treasure of the Sierra Madre 1948
Humphrey Bogart: "If you're the police where are your badges?"
Mexican bandit: "Badges? We ain't got no badges. We don't need no badges! I don't have to show you no stinkin' badges!"
Blazing Saddles 1974
"Badges? We don't need no stinking badges."
If you follow Holmes on homes and have a stuck case just get a hammer and "rip it out"