Harvey/ Ga
Member
You might try measuring the fired cases from your gun and your friend's, to verify that the chambers are not widely different. I measure just forward of the extraction groove.
You could also try loading the fired case in your friend's rifle, and his in yours. Do not let the bolt slam seat the case.
You could also try loading the fired case in your friend's rifle, and his in yours. Do not let the bolt slam seat the case.