A couple of things: First - STOP when unsure. If you think something is wrong, but can't quite put your finger on it; you're probably right. Go through everything from the beginning and don't load anything else until you find out what is bothering you. Sometimes it's important, and sometimes it's not, but check anyway. Second (but along the same lines) - pay attention to the sound and recoil level when you're firing. Most, I'll say the vast majority, of blown up guns are caused by perfectly good rounds that have the misfortune of being fired right behind bloopers that don't clear the barrel. If a round doesn't sound or feel right, don't pull the trigger again until you know why! It's just my habit, but I take a range rod to check the bore on my guns when I'm developing loads. A visual check will suffice if you can see down the barrel, but a rod is easier with autos and lever actions to me. Just use a soft one and keep it clean. A metal rod or a dirty rod can ruin your barrel crown in a hurry. Best wishes, Gary