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IIRC, that's down to the mortar projectile being 3"/76.2mm in diameter, as opposed to the bore of the mortar being 81mm.And yes, that implies a ~2.5mm windage gap between the sides of the shell and the bore.
IIRC, that's down to the mortar projectile being 3"/76.2mm in diameter, as opposed to the bore of the mortar being 81mm.
And yes, that implies a ~2.5mm windage gap between the sides of the shell and the bore.
