That was you, huh? I remember that thread, made me realize how ANY question is relevant here, great group of individuals that can catch even the slightest of inaccuracies!

I shoot about ten different rifle calibers and not one of my bolt rifles shoot better with over-book loads. Most seem to perform best about 100 FPS below max. Maybe it is just me. I was once shooting a very hot 4831 load and using IMR instead of H 4831, or visa versa. The increased recoil sheared a screw in the scope base. Was a 25-06 and not some big magnum.

Which book?. look at a bunch of the older manuals and you will see a decrease in the printed data over the years. The guy who taught me alot about reloading used to commonly go 2-3 grains over max (mag rifle calibers) sometimes 6-7 gr over. I was a little more conservative than he was and seldom have one more than a gr over -- one thing to remember also is that temp has a bigger affect on pressure than you would like to acknowledge. most of my load testing is done at 60-70 degrees f alot of my hunting is done 15-25 degrees f.

I have some old reloading books. In a lot of cases the starting load is about where max is in todays data. Pushing all the way as far as you can doesnt make your firearm more lethal. Bullet placement does though.

In the old books there is no data for a lot of todays powder cause it wasn't around. Another thing to remember is test barrels of the time used c.u.p. (copper units of pressure) not pounds per square inch. Not as accurate.

If your rifle is grouping good then I say your fine if no pressure signs exist. Pushing your rifle as far as it will go will wear it out faster. If you only shoot it 10-15 times a year it wont be a problem. If you like to shoot 100 rounds every weekend, or more, it wont be long you will be buying a barrel.

Just beware of what your outside temperature is. If its ALOT warmer out than when you checked these rounds you could run in to trouble.
Otherwise i say shoot them.

Get rid of those fliers that are on most of your groups would be my priority.

I start the process by keeping the flier brass separate.