I think that I have read that those old .303 guns had both

by Hobie ⌂ @, Shenandoah Valley of Virginia, Thursday, September 01, 2016, 12:17 (3008 days ago) @ CJM

.311 and .308 groove diameters but it depends on the era. More likely .311 early on. Things in that regard were still getting sorted out as people did the natural thing and tried to standardize various aspects of the shooting equipment such as bullets.

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Sincerely,

Hobie


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