Is this a WWII Shotgun Shell Pouch? - FIELD & PERSONAL GEAR

I've been offered this rig and was wondering if this is a shotgun shell pouch. There are the only two photos I have. Also, what is the value of a set like this?

U.S. WWII Khaki Shotgun Shell Pouch – International Military Antiques

U.S. WWII Khaki Shotgun Shell Pouch – International Military Antiques

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How many rounds of ammunition did an infantry rifleman carry in WWII? How accessible was additional ammo during battle? How common was running out of ammunition? - Quora

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Original U.S. WWI Excellent Condition M1918 Shotgun Shell Ammunition C – International Military Antiques