Just ran across this forum so thought I'd post a bit..
I'm in the process of building a 50-90 on a Martini action. (If I understand the rules, this action is NOT eligible for BPCR competition, however...)
First, I intend that this thing will be for BP/lead bullets only. With that in mind, the question of barrels comes up. Currently, I'm looking a two sources, Pac Nor and Badger. Since money is definetly an issue, I'm favoring the Pac Nor. Their 50 cal barrel (.500) is listed as having 8 grooves, twist in 12, 18. and 25 inch, with the 18 being standard.
Would appreciate any comments on the suitability of this barrel for BP/lead.