regarding lengthening of chambers to 2 3/4"... it is my understanding that so long as at least .090 thousands of barrel wall is left in front of the new chambers, then it is safe to lengthen the chambers...
experience over the years has indicated, that most american made guns with fluid steel barrels have heavy barrel walls and can be safely altered to shoot 2 3/4" field loads...not so much so with european made guns, particularly light weight field guns which often have thin walled barrels...
Last edited by ed good; 09/15/18 08:34 PM.