54 cal LRH 1:28" twist http://www.gmriflebarrel.com/product...aspx?id=323938
or round ball specific 1:70" twist http://www.gmriflebarrel.com/product...aspx?id=323788 Pros and cons. Help me decide.

That would be an easy one for me Pluckit. Round balls and .54 caliber are a perfect match. So it would be the 1:70 for me.

The 1:28 twist GM barrel is wonderful in .50 caliber - lots of sabot and bullet combinations. But I just can't get excited about a fast twist .54. If your shots are normally 100 yards or less a 223 grain .530 round ball shoots pretty flat and will do a good job. If you want horsepower and range I think the .50 is a better choice.

round ball 1:70

I always hunted with conicals in my Renegades, so I would go with the shorter fast twist barrel.

No brainer for me. 1-70.

Pluckit - I was having the same question run around in my head not very long ago. I also opted for the 1:70. And I am glad I did. That barrel really shoots (see my recent post). I felt that getting those heavy conicals started out the barrel would not make it a fun gun to shoot. Now I am not recoil shy. But I don't like getting the snot knocked out of me either. My 90 gr load of FFg sends that 225 gr PRB down range with enough "juice" to stop just about anything I want to shoot at.

Thanks for the suggestions. I think the round ball barrel will be my choice. I have plenty of 1:28" twist .50 cal. barrels to play with.