how hard was it to swap bolt heads?I haven't converted an Axis but I have converted a Stevens Model 200 (Savage Mod. 10) short action from .223 Remington to .243 Winchester and then to .308 Winchester. It wasn't that difficult. The parts I had to change were barrel, bolt head, forward baffle and magazine. BTW, I have a sporter weight .243 barrel and an E.R.Shaw heavy barrel in .243 to sell.....