1-14 twist I believe. Tom
Nope, our Savages have a nominal twist of 1-12", which as John stuttered isn't enough to stabilize the relatively long Hornady spire point. Shortening said bullets makes them viable in the Savages. I can't speak to the twist rates of the many varied European arms chambered for the .22HP.
First go to Buffalo Arms. They carry the Hornady bullet as well as their own proprietary bullets. If they're out of stock then you are on your own. Catch them as catch can. The Hornady's seem to be a "seasonal" thing, and appear sporadically. My advice is to stock up on them when you find them.
The Speer 70 grain bullets have been discontinued for a decade or two now. Grab them when you find them.
Haunting the Want To Buy marketplaces around the internet for the last 10 years has turned up a plethora of different .228 bullets which now reside in my stash. That's about the only advice I can offer. I figure I'm set for life, and no, I'm not inclined to part with any. I spent too much time/energy/money to build up that stash to want to part with any!