There is a lot of good common sense going on here now.
I also read a lot of Mel Tappan's work and the only thing I really question today is the actual utility of shot loads in a pistol. Don't get me wrong, I love these things and they are fun to load and to shoot. However, I grew up in the Texas Panhandle and had a lot of run-ins with rattlesnakes and I did kill a lot of them with bird shot, etc. However, I never really needed the shot to do the job. I have killed as many rattlesnakes with a large stick as with a gun (although finding a stick in the Texas Panhandle is harder than finding the snake
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They are not hard to kill. I have also twice been hit with a strike but both times the fangs didn't get through the Levi's + boots. (Tangential, back in the 70's when double knit pants were in vogue, including those that looked like denim, my dad and I were out moving cattle. He was opening a fence gate when he was struck by a prairie rattler. The fangs got caught up in the double knits. I apologized later, but it was funny as all get out watching him try to shake that rattler off. Finally got it off and by the time I quit laughing and we got out the rifle we couldn't locate the sucker. He might actually still be airborne as hard as dad was shaking. Regardless, he started packing his pistol after that).... I digress......
If you can't hit a snake up close with your pistol (without shot) then (a) you need to practice; and (b) if the snake isn't around property where it can be dangerous, let it be.
Shoot All, you are going to have a difficult time making the 17 not work. Those suckers are just plain tough.