OK people.
Extracted head from a well known dark place after reading post by compass will and went to Lee site w/following epiffeny:
Boolit for 303 brit is correct advertised diameter and weight plus larger driving bands and nose. Hmmmm.... couldst it be? So found zip lock bag where good boolits were stored. Voila.... 185 gr cast measuring .313 driving bands and 303 nose. This may be da 303 brit boolit I have been shooting in a Remington 700 308 diameter. Good news is no over pressure signs.
Comments and thought processes are appreciated.
seabreeze
PS- In checking my original post, I noticed I had described boolit as 311 diameter. As mentioned above, it is .313 diameter. Weird.