The hornet has a rimmed rifle style of ejector, mine measures appx .206 wide and is the same width as my .25-06 ejector (30-06/.308/.243/.280/7mm-08 group, and according to one person at H&R is
the same ejector they use on the .22-250). It is taller than it is wde (not wide like a shotgun or rimfire ejector) and it does not use a lifter button and a latch (lifter button) spring. For a rimless case you will need a lifter button installed after drilling the appropriate 1/8" hole in the barrel lug, deburring it and installing a lifter button and latch (lifter button) spring. The ejector itself may be a bit of a problem but I believe at this time the best bet may be to machine or hand file a shotgun ejector to the correct shape, the rear section of the base will also have to be thinned to allow the ejector to drop below the rim and then to spring up again (lifter button and latch spring) and engage the rim fpr ejection. If you take an ejector out of a rimfire (that you may own?) I suggest you look at it and do a bit of brainstorming, if you can get it to fit and work well you could then just send that barrel back to H&R without the ejector and have another one fitted..just a thought. The problem I see now is that the ejector slot on the donor barrel is wider than the rifle ejectors at a width that alllows the use of shotgun ejectors of appx. .312" width. if that slot were narrower or perhaps just by machining the slot in the stub barrel to the proper width, one that allows a rifle ejector appx. .206" wide to slide in and out the problem may be solved....<><....