Roy

Don't ream them unless you have to do so. If there was no crimp, reaming can do nothing good. You can use a uniformer that only works to clean up the bottom of the pocket, but you certainly do not want to make the diameter of the pocket any bigger. You might have to ditch that batch.

How did you remove the crimps on the primer pockets? Are you sure you didn't enlarge the pocket a little too much? Do you have any commercial cases you could try? If you have any handgun cases that use large pistol primers, you might just try to seat one of the large rifle primers into it to see if it fits. You will obviously have to remove that primer before you load that case.

I like 405 grain lead bullets with a max load of Trail Boss or jacketed bullets with 4198.

Are you sure you had the correct gauge if you were trimming 8/10 of an inch too short? That would have trimmed off all the neck and shoulder. Did you mean 0.008 - 0.013 inches?

The previous owner may have shortened the pin. Is it really trimming 0.8 - 0.13 inches too short?

I had some Remington factory 7mm Magnum rounds do something fairly similar to what you experienced. It sounds as if you won't be buying any more Remington primers.

Are you absolutely sure the cases were dry? If they were not completely dry, all sorts of bad things can occur. I agree with Tripledeuce that pouring the Bullseye back into the container was not a really good idea.

My classroom doors had locks on them and could not use the Sleeve.

I have had a Harris bipod for decades and have used it quite a bit with several different rifles. It certainly makes shooting off a rest much easier, but I have never been impressed with the groups I have fired when using the thing. It often makes the groups wander and open up significantly. I would suggest that you get some sand bags and try the rifle without the bipod. That may not be the problem, but it is easy to check. The bipod can introduce a variety of different forces on the rifle that can't always be replicated easily for each shot. The relationship between the rifle and a good rest that is not attached to the rifle is much more repeatable.

"It may be that you strip your barrel of its bearing surface each time you clean it from the range. Do you aggressively clean the rifle after each range session? Stain" I saw that but I never saw where the OP answered whether his barrel was clean and cold or just cold. If it is clean and cold, that may explain a lot.

I do only if I am starting out with a clean barrel.

I have a question that I have not seen addressed. Is the first shot a cold clean barrel or just a cold barrel? A bullet shot out of a clean barrel often shoots to a slightly different place than bullets shot out of a dirty barrel. I shoot a fouling shot or three and then let the barrel cool before I try to shoot for a tight group or whenever I sight in a rifle. I also do not clean the bore of a hunting rifle during the season unless I can shoot it again before a hunt.

Keep in mind when you sort by weight that different head stamps may have different extractor groove configurations. That can make a large difference. If you truly want to know the volume, you have to measure the volume. I sort rifle cases by headstamp most of the time but only sort handgun cases if I am bored. In addition to having greater consistency in your loads, sorting helps keep track of a group of cases more easily. This is especially important for rifle cases. I load and shoot cases in lots of various sizes. The lot may be the cases in a 50-100 round plastic box or in a zip-lock bag. I try to keep that lot together for its entire useful life. I can be alert to potential problems with a headstamp is I start seeing problems occurring in a certain lot with that headstamp. For 223, I have found that Federal cases are shorter than LC and some other cases and may not require any trimming. I am not a serious bullseye competitive shooter with a handgun and just keep using mixed headstamps over and over again until individual cases need to be discarded because they split or have loose primer pockets. I don't think I have ever weighed a case in nearly 50 years of loading, but then again I am not a 1,000 yard competitor, bench rest competitor, or bullseye pistol shooter.