I read the first part of Jourdans article, whoever he is, and he regurgitates the same old myths about improved chambers.
I view them as nothing but larger cartridges than orginal ones that are loaded to higher pressures. I have seen no improvement in case life, stretching or relative velocity. But then I have a chronograph and Kilbourn and Ackely did not.
There are two cartridges however that are even worse for reloading than the so called improved or fire formed ones and they are the 300 HH and the 458 Win. They could be "improved" by an adequate shoulder. The others are a past time or money maker for gunsmiths.
Improved chambers are good for getting thru the winter however.
