Here I thought I was going senile! The MEC Jr, I bought for a son-in-law, was giving us fits. After many thousands of rounds on other MEC'S on the bench, I was in denial.
I finally found a load with Remington hulls, that seemed to get us some finished ammo. But not without losing about 5-10% of the hulls used. Kind of hit and miss, with no rhyme or reason for the frustrations. MEC MUST know what's going on - right?
In the 12 Ga, I learned years ago, to use nothing but AA casings. Think I'll try that in the 410 too.
Regards
Bestboss