I think that if I was to insert full length tubes instead of cutting the barrels 1.5" from the end of the forcing cones, I would flute the barrels to reduce some weight. But, I do like the idea of cutting them about 1.5" from the forcing cones and putting new tubes on. The regulation does seem hard, and being a .22 hornet, its not the most accurate in the first place. Any suggestions on books about regulating doubles? I am thinking of my .410 ga BLNE Zabala Hermanos or one of those EAA 410 boxlocks. Id really like to find an old hammergun, but Ill only try that if this project works. Id also like to convert a .410 to 303 british, but starting small might be best

So far no gunshop I know of has been able to get the "Spartan Gunworks" doubles. Id love to get the 45-70 and restock it, scallop the action, get the blue off it and caseharden it, and then have it engraved a little more. Thanks again for all of the info, CMW