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Two Ukrainian-made Snipex Alligator anti-materiel rifles chambered for 14.5×114mm
(files.catbox.moe)
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Technically, it would be sufficient of they lodge a bullet into the barrel. As soon as the tank fires, the bullet will wedge between the shell and the barrel, destroying - at least - the barrel.
You'd have to be pretty lucky for a bullet to enter from the front in a way that it wouldn't just get blown back out by the shockwave before the shell reaches it.