I struggled with where to put this, but since my problem only happens with my reloads, I’m putting it here. I bought a 1943 Inland M1 Carbine a few days ago. The stock was in fair shape, but the barrel and action were almost new; smooth action and the rifling had almost no wear. After a day of cleaning, I shot two boxes of PPU through it, and it ran perfect. A couple days later I reloaded my brass using Lee carbide dies, jacketed Armscor 110 gr bullets with 14.3 grains of W296 and a COL of 1.680”. Should have been a perfect load. I’ve run them through my Auto-Ordnance M1 carbine before, and they usually run fine. Every one of them went almost into the chamber and stopped. I would have to bump the charging handle on every one to seat them. After came in, I measured the overall length on my factory PPU, and it measured 1.650”. I then made up 4 dummy rounds 1.680”, 1.675”, 1.670”, and 1.665”; and tried them in my carbine. The 1.680 and 1.675 wouldn’t go all the way into the chamber without bumping the handle. They also had rifling marks after ejecting. The 1.670” dummy round would chamber most of the times I tried it, and the 1.665” dummy round chambered every time. It could be that the rifle has a short throat... maybe... I don’t know. My question is whether or not I can load my bullets to a shorter COL so they’ll chamber and fire without hanging up? How much pressure would build up by shortening the overall length from 1.680” to 1.665”? Could I maybe load starting loads of H110/296 and still be safe with this length?