I found several "blown out" 375 brass at a local shooting spot and at first I thought they were Ackley but when I put them side by side with Ackleys the shoulder is farther foreward (shorter neck) by about 3/32" and the shoulder angle is steeper. I would like to find what they are as I will be adding them to my collection and they MUST have the propper label!

Wasilla

I don't think the Hoffman was an improved magnum. The ones you found could be a 375 A SQUARE but I don't think the A SQ neck is that short. May be somebody's pet wildcat? Bigger question is why would somebody leave brass like that laying on the ground?

Ray

It could be the 375 ICL, as that line used 45 degree shoulder angle.