I have the opportunity to buy some PMC Bronze Ammo or Federal Lake City Ammo xm193 is one of them a better brass and easier brass to prepare for reloading. Thanks Craig

the lake city brass should have crimped in primers you will have to remove the crimp to reload them.
they may also have less case capacity.
wouldn't stop me from getting them though.

Have used a little PMC once fired brass but do not have enough of it to build high precision ammo with. Seems fine. Is certainly better than Federal brass.

Have used a lot of LC brass in AR actions ... is very consistent within a year and wears like iron. Makes good precision ammo.

LC does have to have the primer crimp removed. (My Dillon 1050 does that on the way.)

PMC target 223 is very good for factory ammo.

Easier reloading PMC , Better brass LC IMO !.

With a .223 case , capacity isn't an issue but " CHARGE IS !.

I Borrowed this and it's Accurate so I'll post it !.

Here is a an explination from Ammo oracle. Go to the webisite for more info. Q. What is the difference between 5.56×45mm and .223 Remington ammo?
In the 1950's, the US military adopted the metric system of measurement and uses metric measurements to describe ammo. However, the US commercial ammo market typically used the English "caliber" measurements when describing ammo. "Caliber" is a shorthand way of saying "hundredths (or thousandths) of an inch." For example, a fifty caliber projectile is approximately fifty one-hundredths (.50) of an inch and a 357 caliber projectile is approximately three-hundred and fifty-seven thousandths (.357) of an inch. Dimensionally, 5.56 and .223 ammo are identical, though military 5.56 ammo is typically loaded to higher pressures and velocities than commercial ammo and may, in guns with extremely tight "match" .223 chambers, be unsafe to fire.

The chambers for .223 and 5.56 weapons are not the same either. Though the AR15 design provides an extremely strong action, high pressure signs on the brass and primers, extraction failures and cycling problems may be seen when firing hot 5.56 ammo in .223-chambered rifles. Military M16s and AR15s from Colt, Bushmaster, FN, DPMS, and some others, have the M16-spec chamber and should have no trouble firing hot 5.56 ammunition.

Military M16s have slightly more headspace and have a longer throat area, compared to the SAAMI .223 chamber spec, which was originally designed for bolt-action rifles. Commercial SAAMI-specification .223 chambers have a much shorter throat or leade and less freebore than the military chamber. Shooting 5.56 Mil-Spec ammo in a SAAMI-specification chamber can increase pressure dramatically, up to an additional 15,000 psi or more.

The military chamber is often referred to as a "5.56 NATO" chamber, as that is what is usually stamped on military barrels. Some commercial AR manufacturers use the tighter ".223" (i.e., SAAMI-spec and often labeled ".223" or ".223 Remington") chamber, which provides for increased accuracy but, in self-loading rifles, less cycling reliability, especially with hot-loaded military ammo. A few AR manufacturers use an in-between chamber spec, such as the Wylde chamber. Many mis-mark their barrels too, which further complicates things. You can generally tell what sort of chamber you are dealing with by the markings, if any, on the barrel, but always check with the manufacturer to be sure.