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From the info I found on SG, its a 1:24 twist rate. (If you found this answer helpful, please mark it as the "Best Answer". Thank you.)

Caliber: 450 Bushmaster Barrel: 18" Twist: 1-24

Barrel Twist: 1:24" Nicknamed the "thumper," the .450 Bushmaster round pushes a 250-grain projectile at 2,200 FPS. With 2,800 foot-pounds of muzzle energy, it delivers plenty of knockdown power for everything from feral hogs to bear and elk. The 450 Hunter Rifle from Alex Pro Firearms puts the potent round in a familiar package…making it a great choice for the big-game hunter who's comfortable with the AR's controls.

1:24 twist