Some time ago, Ken Waters did an article on the .22 Hi-Power. He found that the Hornady 70 grain .227" bullets did not stabilize in his rifle. He did have good accuracy with the Speer 70 grain .224" bullets, also with the Speer .227" bullet which is no longer made.
<br>Hornady may have redesigned the .227" bullet since the article was done.
<br>The Ken Waters article can be found in his "Pet Loads" publication.
<br>I shoot 64 grain Winchester Power Points in my .22 Hi-Powers and get good accuracy.