Focus more on bullet length than simply bullet weight. I have a CZ 527 in Hornet and it will not stabilize some Noslers 35 grain lead free ballistic tip, but shoots 40 grain V-Maxes very well.
In general I've found any 40-grain plastic-tipped lead-core bullet will shoot well in 1-16 twists, whether in the .22 Hornet or .222 Remington. This is because the lastic tips are so light, they don't count much for overall length. JBM Ballistics' bullet stability program has an input for plastic-tips because of this.
My present .22 Hornet is a rechambered and center-converted BSA Model 15 .22 rimfire target rifle, which were based on the small Martini single-shot action. It shoots 40-grain Ballistic Tips or V-Maxes into sub-inch 5-shot groups. So does my early Sako L46 .222 with a 1-16 twist.
