Bullets and accessories are very limited in 45s. That's why I stick to three different twists in 50 caliber (28-48-66) and a long barrel 58 Renegade percussion I own.
For more information on shooting the real heavies and how it applies to today's rifles, not 10-15 years ago, you should contact Dave at No Excuses bullets.
http://www.muzzleloading-bullets.com/index.htm
Here is his email address
[email protected]