It is my understanding that ERA barrels were attached and torqued to the actions using a hydraulic device rather than by hand and, as a result many were grossly overtorqued. It was this, rather than defective receivers that would then cause the cracks you sometimes hear of on this and some other boards. If you have the barrel replaced have the smith make a relief cut on the barrel to reduce the torque necessary to remove the original and you should be OK. This assumes that the receiver is not already cracked.
BINGO, ERA's are no harder than Win and Rem. receivers. Bill Leeper is the B.C. choice for you.