For the record:
.30-'06 (Cal. .30, M1906) was the THIRD smokeless-powder design actually adopted as their Service cartridge by the USA. FIRST was the almost-forgotten .30-40 Krag which just happened to use a charge of 40 grains of the stuff. Then there was the .30-'03 which they have managed to forget completely. This was shortened 1/10 of an inch and the 220 replaced with a 150 to give the .30-'06.
Strictly for the record, now, France adopted a smokeless-powder cartridge in 1886, Germany in 1888, Spain in 1892, Italy in 1891, Holland in 1893, Denmark in 1889, Belgium in 1889, Argentina in 1891, Austria-Hungary in 1890, Great Britain in 1892. It must be noted that both Austria-Hungary and Great Britain had smokless-powder ammunition under development in 1888, but issued ammo with compressed blackpowder charges as an interim measure. The .30-'06 came along about 15 years after most of these...... and well after the .30-30WCF was introduced with the 1894 Winchester.
General George Patton DID term the M-1 Garand rifle (designed by a Canadian, which they like to forget) as "the greatest combat implement ever devised". General George Patton also referred to himself as the reincarnation of Julius Caesar, who is well known to classicists to have believed that he was the reincarnation of Alexander the Great.
Oh well, when you have the three greatest generals in all history in your front line, at the same time and eating only one set of K-rations, I guess the truth can be ignored.
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. Garand is the longest serving military rifle - NO 
