[Pvt Flagg]

the bar ..and springfieald model 03 both chamber a 7.62x55 mm cartrige ...

and for this im cuting and pasteing from a firearms doc

Did You Know?
In World War I, the Winchester Model 1897 quickly became known as the trench broom, for it's ability to clear the trenches of opponents and sweep the skies of grenades. Using buckshot loads, US soldiers could deflect enemy hand grenades hurled through the air.
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and as for the 7mm mouser ..it fires a 7.92 mm round ..but was made for ww1 ..and had chambering problems ..

Flagg

Operation Air cooled, gas operated, magazine fed, shoulder type
M1918A1 selective fire (fully and semi-automatic)
M1918A2 fully automatic
Caliber .30 (7.62 mm)
Muzzle velocity 853.4 mps (2800 fps)
Capacity 20-round detachable box magazine
(1) Bandoleer (BAR belt): 12 magazines
(2) Magazine changeable in 2-4 seconds
(but averaged 6-8 seconds in combat)
Weight 8.33 kg (18.5 lbs)
Overall length 119.4 cm (47 in.)
Rate of fire 550 rounds per minute
Effective range 550m (600 yds)
Ammunition (1) Ball M2; 150 gr bullet, 50 gr charge
(2) Tracer M25, M1: for designating targets and signalling
(3) Armor piercing M2 (black tip); 165gr/53gr
(4) Armor piercing incendiary: for lightly armored flammable targets

god i love bar's!