I have a Steven's Tip-up addiction, and have collected some interesting ones over the years. 30yrs ago or more, I came across a pocket rifle with a dozen or so barrels in a wide variety of calibers; some factory barrels and others gunsmith made. The frame was altered to accept a firing pin for center fire cartridges. At the time, I was told it was made up by a prominent gunsmith in Maine, most notable for his target muzzleloaders. Anyone know of such a person? I'm not certain of the purpose of this gun, but I'm sure it had something to do with ballistics, as none of the barrels have sights and look to be totally utilitarian. I also came across a Lady's Tip-up which has been converted to .255 Dean. Using 25-20 load data, the accuracy was awful. Once I go beyond the 25-20 recommended loads, the accuracy has started dialing in. The bore was terrible. I've been shooting jacketed bullets and find the bore is cleaning up considerably. I'm shooting a 2 1/2" group at 75 yards whereas before all this trial and error I could hardly keep it on the paper. I was hoping to get some load data on the .255 Dean, but have been unable to find any recommendations. Trial and error has been working well so far.