I shot all four barrels today[6/15]. I could go into lengthy comparisons of grouping and drop, but I wont. Briefly, they seem to shoot the same as before the extensions. I must note that after about 10 shots the 30-30 extension came off. I dont know when it came off and could not find it. I didnt hear or feel it when it went downrange, odd. I am quite sure I will be provided a refitted replacement. My feeble guess is the reblue process may have loosen it. I am pleased with all of them [44mag, 327max, 223, 30-30] and find this barrel modification much easier [cheaper] than a carbine barrel.
I will report on what is up with the 30-30.
P.A.