If you have an older gun that has short cone for the old roll turn over cases,then by all means have the gun rechambered to a modern profile . I have done this on a lot of guns whilst not actually deepening the chamber past it proof tolerances.
About15 years ago long forcing cones became the "in thing" hear in the UK a trend that has now been long forgotten. The proof house did some tests and concluded that there was no or no significant difference in recoil or barrel pressures. The pundits raved on about easier shooting and a reduction in "muzzle flip"{?}.
I was at a game fair on the GTA stand and the subject came up ,I was asked "As professional gunsmith what is your opinion?".
My answer was as follows" I have no opinion ,but at 35.00 a time ,I'll do them all day".
