- Location
- Newmarket,Ontario
That's definitely not 7.62X51mm, length and shoulder angle are wrong. That's a .30-06 blank, I'd bet bottom dollar on it.
These are US 30-06 M1909 noise blanks made by Dominion Arsenal in 1951.
DEFINITELY NOT grenade blanks and would be dangerous to use for firing grenades.
The common 30-06 grenade blank (M3) has a star crimp.