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Well, the Spaniards drilled vent holes when upgrading to the model of 1916.
I guess they thought the vent would help get gas out from a blown primer or split case better than the slight reduction in metal.
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Its my understanding the Spanish 1916's were rechambered for the NATO 7.62x51mm which isn't as hot as commercial .308. I had one and my gunsmith, actually a master builder told me the receiver would eventually stretch using factory 308 loads.