The only gun I was ever truly intimidated by was the 120mm main gun on the M1A1 Abrams. I remember the first time I sent a sabot round downrange. Scared the crap out of me. Simply awesome. If the driver had the tank in neutral and didn't have the brake set the recoil would roll all 69 tons of the thing backwards a good ten feet. Like anything, you eventually get used to it. Fun stuff.
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