Interesting, the original question was, can you extend the forcing cones to shoot 2.75 shells in a gun chambered for 2.5 shells. The answer is yes you can, then everyone pontificates over pressures and such. Heck the writer even said that he understood the pressure issues in older guns. Not everyone reloads, I don't reload and it's much easier for me to get low pressure Winchester AA's then to have to mail out of state for my ammo. The 410 I extended the cones in was a Nitro Special with super thick barrels, no worry there.
As far as having barrel thickness checked, even the British proof house will let you extend forcing cones without making you get the gun reproofed.
As far as reloading, every blown gun I've ever seen came from an incorrectly reloaded shell. I did lie earlier though, I do reload black powder shells, I like the resulting shock & awe you get with black powder KABOOM
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Steve
