Probably from his dad...or some character that shoots big cats with a .38 Snubbie.  Something like that...  Hey we do still have a big bore around here somewhere but only use it on big stuff, a 243 is too brutal for everyday use... 
Will Munny: It's a hell of a thing, killing a man. Take away all he's got and all he's ever gonna have.
The Schofield Kid: Yeah, well, I guess they had it coming.
Will Munny: We all got it coming, kid.
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