Tested 3.5" plastic cases in NEF, small
primers. My chamber is long for our
long brass case, so they work fine.....
600 gr slug, 105 gr of IMR 4227,
got 2100. Same slug, 180 gr, 7383 surplus,
got 2100 fps. That's 5800 ft lbs from 12ga
plastic shotgun cases.Ed