Swipes ???

[marine71]

I have noticed ejected cases having a light surface indication ( brush marks ? ) at two locations across the face of the case base 180 deg apart. Is this a swipe ? What needs to be done to eliminate this or is it ok as is? All shells eject out to 2 o'clock and approx 6 ft clear. Any help would be appreciated.

[caporider]

What load are you shooting in your rifle? What type of rifle do you have?

Ejector/extractor marks on brass are not always pressure signs, but having more detail would help...

[constructor]

cresent shaped scrape marks are swipes, it could be from early opening or high pressure or a combination of the 2, could be from a new bolt too.
Higher pressure can be from excess oil in the bore, run a dry patch through several times to remove the excess.

[marine71]

I'm running a DD 5.56 16" shooting M193AF. Weapon is cleaned lubed and completly wiped down both inside and out. No resid oil in the bore.
I was wondering IF a stronger ejector spring is needed but then as I stated the empties eject consistantly/repeatibly.

[68WJ]

Try posting some pics in the "General" forum. More people are likely to read it and offer assistance than in a vendor area.

[constructor]

I'm running a DD 5.56 16" shooting M193AF. Weapon is cleaned lubed and completly wiped down both inside and out. No resid oil in the bore.
I was wondering IF a stronger ejector spring is needed but then as I stated the empties eject consistantly/repeatibly.


M193 says it all, the mil spec M193 and 855 loads show swipes in almost every rifle I have shot since the early 90s. A heavier buffer and buffer spring may tame it a little, other than that I would just shoot it.

[marine71]

Thx to all, I'll keep an eye out on it and see IF will behave itself.

SemperFi

[commando57]

Does the M193 have the corresponding velocity increase?

[constructor]

Does the M193 have the corresponding velocity increase?

Yes, mil spec ammo runs at 58,000 psi in the 5.56 chamber, M193 pushes a 55gr fmj to 3150fps from a 20" barrel.