** I bet barrel life wasn't all that long. **
A battletank isn't built for eternity either. The basic 8,8 Flak 18/L56 (56 lengths of caliber) was designed to engage aircraft at an altitude of 12000 meters. The Königstiger's KwK 43/L71 was an improved version of this. Wear & tear don't count in combat. I don't think it makes any sense to compare ballistic properties between artillery and small arms. The two are "playing" in different leagues.
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