Not a Cowboy Action shooter, do know some guys that shoot Cowboy at our club.
Light loads with big cases like 44/40 45 LC 38/40 etc. designed for Black Powder, when using smokeless, work best with light charges of Unique or other fast pistol powders and cast bullets. Risk of double charging is a concern though. You could probably triple charge a 45 LC with Unique. Double would be a problem with most Single Actions or Lever Action Rifles. Triple much worse.
Trail Boss fills the case giving low recoil and velocity action shooters want, while avoiding the risk. That's its purpose and from what I hear pretty good for the job.
If I was going to try TB in a shotgun would load some up with stacked wads, and test for velocity using a beater 12 G single shot held in a rest. Real question is to what end ? 2 F Black is probably the optimal stacked wad shotgun powder might as well use it instead of substitutes
William
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