Grease groove in WWII .303 bullets important or not ?

[Bruce_in_Oz]

The 1879 Remington Lee, in .45-70 has the "second locking lug", opposite the big one on the right side of the bolt body, just like later Lee Enfields.

Lee's slightly later 1885 pattern is likewise equipped and has a number of features, some carried over from another earlier Lee, the 1882, that went on to feature on the Lee Metford and subsequent derivatives.