Davjd et all,ovenpaa wrote:We were with some of the Continental Palma team last week and I was very impressed with the way one was swapping barrels, he just screwed them on by hand, backed them off a 3/4 turn then spun them round by hand to lock them and that was it, job done. The barrel had two registers on the tenon which helped no end. It is interesting to see just how many MR &TR shooters also only hand tighten barrels.
Yes the correct spanner is always best.
Apologies for the advertising, but this is only possible thanks to the rear locking of the INCH allowing a longer barrel shank and a larger barrel theads diameter. The two regiisters are close (ISO H7-g6) toleranced, and the threads inbetween only serves as what a thread is intended to do: tighten (threads are never totally self-centering). Also,the fact that, in a rear locking action, the bores are stepped up from rear to front allow to machine them in a single operation from the front, adding to the general concentricity...
The late Laurie Ingram, shooting an INCH proto in F-Class swapped barrels that way up to 3 times a shooting day with no zero shift.
FWIW
R.G.C