After reading all the posts referring to the length topic I have concluded that it is perfectly safe to use 67mm and even 70mm shells, loaded to CIP standards in my Manufrance Ideal proved to 1100 Kilos with 65mm chambers.

I had the daring some time ago to post this in the 16ga.com forum and was chastised by a pigheaded, opinionated and extremely impolite member there. I never visited again. As someone said you should not argue with idiots.

Bottom line, as Larry says, it depends on the gun and the load, not necessarily the length of the shell. And of course, if you are not sure better to err on the safe side.

JC

"...it is always advisable to perceive clearly our ignorance."ť Charles Darwin