My Deer hunter likes the TC Break-O-Way sabots but they're made to fit .44 bullets.

http://www.huntingnet.com/forum/blac...-48-twist.html

http://www.smokewagongear.com/p-601-...ots-50cal.aspx

Barnes has a 225 grain copper pistol bullet that's about the same length as a 250 grain lead bullet.

http://www.barnesbullets.com/products/pistol/