I’ve never really sought out big calibers. 44 magnum is the largest pistol, 30 cal the largest rifle (or 303 if we are going off diameter) and I’ve never let off a canon. Had a chance to many years ago, but I didn’t want to pay for the powder at the time. Knocked back a go on a Boys around the same time - because I’d been drinking.
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Actually the biggest calibre I’ve owned and are my .73 smoothbore doubles
Shot a few rounds from a .375 H&H… that’s it for me.
Biggest i’ve shot is 416 Rigby, and the biggest i own at the moment is 300 win mag which is just big enough to take care of bunnies and cane toads.
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Biggest I’ve ever shot was 7.62x39. Positively tiny compared to you guys.
7mm rem mag
I have nothing on you blokes as the biggest rifle I have fired is 300WinMag.
I have used a 50 cal machine gun though if that counts.
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I think it counts probably more than the rest of us that have just shot a bolt action 50.
Yep the 50cal machine gun would definitely be one of those “i need a private moment” experiences. And it counts for sure.
Yeah I’m pretty sure that counts mate! 
Done the job mate. 
I love my 300 more than my 458, but shushhh she might be listening… What projectiles you running there ? , I run Woodleigh 220gn’ers in the 300. Just never left me wanting on any of my target species… 
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500 A square. Did have mercury in the stock though.
When I was younger I fired a shoulder mounted 120mm smooth bore. You could say the projectile was about the size of a piece of fruit…say an orange or thereabouts.
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While I’ve shot larger calibre muzzle-loaders, the largest calibre cartridge rifle would be a mates 1885 Winchester in .50-110. Once was enough of that for me. A 700 grain bullet on top of 115 grains of powder in a 12lb rifle was very unpleasant to shoot with a shoulder that needed surgery.
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Biggest ive ever had the joy of shooting is the lahti l39 20mm anti tank . A friend’s father has 2 of them in his collection in qld . And shooting that alongside the 700 nitro express on the same day. Left me feeling it deep in the shoulder muscles I can tell you that
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