Do NOT use .30-40 brass to make .6mm Lee Navy.

[andiarisaka]

The .236 indicated approximate bore diameter, like .303 does your Enfield, .236"=5.994mm. Groove diameter of the Lee is .243, don't let the conversations of those who don't know on the other forum make you think "wrong size bullet". Actually, it's close to the bore diameter of most modern 6mm barrels, Obermeyer 5R barrels being the exception, they have a bore diameter of .233". European made 6mm barrels have a bore diameter of .237"