Just a heads up, this isn't a rechamber you want to try by hand, needs to be done on a lathe or at least a drill press, it's way too easy to end up with an egg shaped chamber due to not being able maintain perfect alignment with the bore.
Same ejector as the original 17hmr worked just fine for me. I didn't need to modify. You will need a centerfire sb2 receiver to fit your barrel to. I've also used an older topper receiver that worked fine. The large firing pin sb1's may not work. I believe the pressure from the .17 hornet to be similar to the .22 hornet which was available as an original topper chamber.
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