.338 mmg

[mongoosesnipe]

Two main advantages.

- Increased barrel life, due to lower MV, smaller powder charge

- Able to use longer, higher-BC bullets

Same principle as 6.5 Grendel.

The ability to use higher bc bullets is relative to the length of the action used and overal cartridge length using 300 smk set to he same oal length they are probably nearly the same as the nm has 6% less capacity than the lapua

Similarly the 6.5 grendl does not have a balistic advantage over .260 Remington

As far as barrel life is concerned its a different ball game with machine gun barrels full auto fire burns up a barrel pretty quick compared to sporting use often mgbbarrel are built to significantly differt spec to attempt to extend barrel life even still if more than about 100 rounds are fired without a cooldown period or barrel swap the barrel wil most likely be toasted as it will have gotten hot enough to anneal the steal