excessive pressure?

[Blwnbwtie]

I took my Off list AR out today and fired 100 rounds, in which it functioned flawless. I noticed that the winchester 5.56 ammo was getting a little chewed up on the rim, but the remington 223 was fine. Flipping through my hornady reloading book it says that this could be a sign of high pressure. Could this be true, or is winchester brass softer than remington? My upper is supposed to be rated for 5.56.

[C.G.]

Without pics it is not easy to say, but it sounds more like your extractor may have a burr.

[StraightShooter]

Chewed up rims is usually the last sign you will see regarding overpressure. If you look at the back of the case do you see a shiny circular impression? How do the primers look? Are they flattened out?

[-hanko]

Without pics it is not easy to say, but it sounds more like your extractor may have a burr.

First sign of excessive pressure is a flattened primer. Pictures are here...http://freedomsight.net/?p=2109

Assuming the Win is factory ammo, very unlikely you'll see signs of excessive pressure.

hth

-hanko

[Blwnbwtie]

I did think it was high pressure being a factory load, just seemed kinda wierd that it would only happen will the winchester ammo and not the remington ammo. I would take a picture but my camera probably isnt good enough to even see it

[brando]

Here's some good examples of pressure issues. This was a combination of soft brass (I suspect) and excessive headspace.

http://www.box.net/shared/sbyjqp2ck0

[ar15barrels]