I will have to shoot it again this weekend and look at the ejection pattern closer. I will give up mild 223 to gain durability with 556 loads.
Even AE 223 and 55g 223 pressure handloads never got the the right of 2:00. Even without the can.
As one would expect the higher pressure ammo, can, etc pushed things to 1:00.
Mk262 was 1:00 with and without a can.