It is not a Handi rifle but I have a Stevens 322 that I rechambered to K-Hornet. My Case life before I reamed the chamber was less than 5 loads, and that was with minimum loads or less than published minimum. After I removed the barrel I found that the factory Hornet chamber was .003 canted off of center with the bore. No wonder cases split after 3 or 4 firings. This set up is typical Savage/ Stevens, A barrel lock nut to hold to receiver.
I actually shortened the breech end as much as I could to still leave me 1/2 turn of the nut to set head space, The barrel actually had almost 1/2" of extra threads. this allowed me to carefully ream a new chamber with some of the old chamber removed. I was able to correct the Cant to less than.001. Now my cases will last 12 to 15 firings with no sign of head separation.
Now to neck Size my K-Hornet Brass I use a 223 Lee Collet die, I had one already. I made a extended shell holder that actually allows the use of the 223 collet die. I did have to recess the aluminum cap on the die also to alow the decaping rod to raise for the short lenght of the K brass. to use this die with 223 brass I just insert a short rod in the hole I bored in the top cap.
Yes I know I am thrifty.
I have shot Coyotes at 200 + with the K-Hornet with a 46 grain bulk Bought Win bullet over a safe charge of IMR4227, This has always been my mostest liked powder in the Hornet/K-hornet. My crony indicates 2800 FPS with the Win Bullet in the K-Hornet.
My Brother's Handi 22 Hornet really likes a Cast Boolit that I just started to use. It is a NOE 22-055 that I purchased on a group buy custom mold from a different site. My K-Hornet will not stabilize them with it's 1x16 barrel, the Handis as you Know have 1x12s or 1x9s since 87. We have neck sized Bryan's Brass with my Collet arrangement to work up loads. our current load is 9.5 of IMR 4227 with a this 61.2 gr gas checked Bollit. this load cronies 2047 ou of his Handi. and shoots outstanding.
This is his second kill with the cast and Handi, I believe he is chasing coyotes today with neighboring farmers using Dogs. and his neck sized brass in a Handi. this Pigeon was laser ranged after the shot at 120 yards.