Where can i find a 20-250AI reamer?

Anyone have experience with this cartridge? Want an 8 twist 20 cal to use the 55 Berger's for calling/thermal work.
 
Go with a 9 twist, I know guys who have bullets come apart after about 300 rounds on the throat.
Good to know. Other bullet option is the 48gr hammer they state 1/8 twist to stabilize. That's why I was leaning that direction. Guess I need to make a bullet decision. Preferred does offer an 8.5 twist precambered tikka barrel which saves gunsmith costs.
 
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