Well any "Bullet" (minnies and Maxi' included) require a faster twist than a round ball just by it's shape and aerodynamics.
so pretty much anything slower than 1-48 in 50 cal and up,,mite as well forget,,there is always some odd-ball that comes up with some miracle patching or lube and claims supurb accuracy, but if it where the case, they'd be on the market!
I know some guy's personally that have had some luck with 1-48 twists. The guy's over on the modern should be able to help. I feel your pain man,,Damn Californication Regs!! And, how's a guy sposeta find a good combo with out spending 200 experimenting!! Good luck