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Fists do have more penetrative force than a bullet in DB, since it is a fictional world and these are fists from superhuman level beings we are talking about: you could attack all day Dr Gero (a multi-planetary level being) with any kind of bullet you can think of, and he still wouldn't notice you; yet, the hand of 17 passed through his body like it was nothing.
Also why should Boo bother about that man with the machine-gun exactly? You said it yourself: he knew that guy couldn't obviously beat him, and furthermore he has godly regeneration, so I honestly don't see how Boo standing still while some dude shoots him with a gun is a proof of Boo's body maximum strength

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Boo's body is soft while unguarded, true. But this still proves nothing since when he fights his body strength it's obviously up to top tier Boo saga characters, and this is what really matters.

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And?
Smashing Madara's sphere thing, while impressive in Naruto, tells us nothing by DBZ standards.
Also, basically every feat performed by DB characters up to the 23rd Budokai has been done with pure physical strength alone, since, as we know thanks to Goku's training session charts, the real decent Ki mastery begun only with Kami's training.