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I own several 22 CF guns and a couple of fast twist guns that I have built myself. First, the 1-7 twist, which I have in a 22-250 AI, cuts at both ends. Yes it stabilizes the heavy bullets but it will not stabilize below 60 grains. The 1-8 twist, which I have in, a 223 will stabilize well at 80gr and down to at least 50gr. But if you want to shoot lighter, faster bullets you will need to go to at least a 1-9 or 1-10.
With an 80 or 75 gr .224 bullet all you need is 3,000 - 3200. Once you get the long bullet moving it is, at long distance, very deadly and very accurate at the lower velocity levels, making the 3200 to 4000 level unnecessary. Sounds strange but it is true.
Were I to build a rife today, as you have described, it would be a 1-8 and not a 1-7. That is not based on a guess, but on experience. It would also be a 22-250 or an AI as the AI has become almost a standard cartridge with dies available at regular prices. Also, the start loads for the 22-250AI are the manual loads for the 220 Swift. The AI just gives a shorter load column.
If you want a truly fast 22 CF, the 22-243 Mindenhall is about as fast as it gets, in a reasonable cartridge capacity, near 5.3k and you do not burn a heap of powder getting there.
Best,
Ed
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