That and weigh the empty cases, one might be thicker somewhere giving less capacity? Can't have been a major overcharge as the brass or rifle didn't let go, but do not shoot it until its been inspected by someone who knows Lee Enfields. They behave differently and fail in different places to a front locking action. Also quarantine the remaining ammo - it might need to go back for assessment by the factory. Take a photo or two of your brothers mug as well before it heels. Something is very much not right there, might not be the ammo at fault but lucky to not have had a catastrophic let go. Did you sight the target between shots to make sure you hit it or did you only pull it after the third round?
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