I believe from material I have read 2 5/8" 12ga shells were loaded to lower pressures than 2 3/4" shells. I am not sure when 2 5/8" in shells were discontinued. I have a VH from 1927 that was ordered to have 2 5/8" chambers.
The Remington Shur-Shot box below contained roll crimp paper shells and a warning to not use in Dam or Twist or chambers shorter than 2 3/4".
