I've had a 243 handi since this past spring. I've been shooting strictly handloads in it, shortly after shooting it for the first time the action started popping open,I know a common handi issue, I've was also having problems with my brass cracking about 1/4 inch up from the base, After research and contacting H&R it was determined to be a headspace issue and they would take care of it, so I sent the gun back after a few weeks I got it back it seemed fine at first, now it's popping open again and cracking the brass again, The loads are not max loads and we shoot them in two other non-handi 243's without any problems. I've followed most of the advice I found here but nothing seems to help thanks in advance cliff