I drew for a NM muzzle deer hunt for next year and don't have much of a clue where to start in choosing a muzzleloader. I want a rifle that would comply with Colorado's muzzle rules (iron sights, no sabots) so I want a rate of twist and barrel length that will work with traditional bullets. Any basic rules of thumb to start with would be helpful. I also need a setup that will work with moderate loads because of a history of retina tears that make heavy recoil a bad idea. I'm willing to accept the range limitations that result from conical bullets and a moderate charge.

Thanks in advance for any guidance.