Actually, thank you, Carcano. Investigating further on European website blogs reveals the same advice you are giving, with one gunshop stating that they will not install an einstecklauf larger than .22 Hornet, "even if it costs them business." Fair enough, but it should also be stated that over on this side of the pond, such things are not common knowledge and are largely unknown. When a manufacturer advertises such wares, the temptation is to think that they are suitable for use! The warnings/experiences of others indicate that that is not the case. Many, myself included, could dream of a double rifle option on the cheap which just does not exist in practical application.
It would be a service to all to have these guidelines/cautions spelled out for the instruction of any who might be considering utilizing an appropriate caliber einstecklauf. Not so helpful to criticise if "the calf is already out the gate."
Could you mention for us which locking systems on drillings are appropriate for larger calibers?
I don't recall seeing the warning on the Keller & Simmann's website--maybe they should make it more clearly seen?
