hello all i was givin a whole bunch of the bullet on the left. i was told that they were 303 british. but i noticed that the sholder is shaped different than the the remington "middle" and S&B "right". the rim is stamped "HXP 73" has green sealer around the primer. the rim is .531 x .062 bullet diamiter at the mouth of the casing is .310. my question is are these 303 british and are they safe to use in my jungle carbine?
thankyou,
steve