If you are searching for the Federal Premium 55 gr BTHP marked P223E, you can get it at [url]www.natchezss.com[/url] for $11.72 per 20 round box. You can also get it at [url]www.sportsmansguide.com[/url].
You don't mention what you intend to use it for, so let me give you the ammo's pros and cons:
In it's favor is it's accuracy. It shoots well in my experience and is my standard varmint ammo for the .223 caliber. It's also readily available meaning it isn't hard to re-supply when you run out. It is also very lethal on smaller targets (let's say coyote size and under).
But it wouldn't be my first choice for use in self defense or for hunting deer. In tests it only offers about 9.5" of penetration in ballistic gel. The FBI minimum standard for penetration of their duty ammo is 12". In certain situations where you are making an angled shot which may have to pass through an arm before entering and crossing the torso to reach the vitals, this load may not be as effective as others. Granted, it would probably work well in about 90% or more of the shootings in which it is used in. But who wants to find themselves in the lower percentage of the situations in which it doesn't work? Remember, a target isn't going to stand still and offer you a straight in torso shot unless they are suicidal. So use a load capable of reaching the vitals regardless of the angle. Again, there are many loads out there such as the Hornady and Black Hills 75 gr OTM, Black Hills 68 gr OTM and the Federal and Black Hills 69 gr OTM that all offer performance equal to or better than the 55 gr BTHP. And all of those loads offer adequate penetration, something the Fed 55 gr BTHP doesn't.
So if you are seeking an accurate load for varminting or target shooting, the Fed 55 gr BTHP would be a good choice. If you are seeking a self defense load, I would choose one of the 68-77 gr OTM match loads from Black Hills or Federal. And if it's for non-varmint hunting (deer sized game) I would choose the Federal 55 or 62 gr Trophy Bonded Bear Claw or Winchester Supreme Power Point Plus 64 gr SP's.
-Charging Handle