Nobody's answered the question so I will: A 10 inch twist is usual for almost all military .30 calibers. It will stabilize even 220 grain bullets, but nobody uses them anymore. Target shooters seem to dwell on 12 inch twist for their specialty. I do not know of any .30 caliber rifle that uses a faster twist, but somebody will point one out if I mention it.
I reload about 20 different cartridges, over half of them obsolete. If all you do is hunt a few trips per year, it's very uneconomical. I don't hunt anymore, except for defending the kitchen garden, but I keep myself interested by trying new cartridges and new loads. After totting up the expenses of my typical hunting trip (gas, food, beer, clothing and accessories, etc.) I think I'm actually saving money.