The box is Sellier & Bellot
FMJ/M193
3.6g 55 grs
4.4mm boxer
Considering that it's a good company (S&B), I would say that it is safe to shoot in your Handi .223Rem. The reason I asked is, if it was Wolf or Tula (which is the military arsenal producing Wolf), I would not recommend it.
I
personally have a Glock 17 in 9mm, that was damaged by what I believe to be an overcharged round. After I contacted Wolf/Tula, they agreed to pay for repairs, I had to have the frame replaced, along with a magazine. I won't shoot any of the Ruskie stuff except in Russian or Chinese surplus arms like my SKS's.
For the record, there
is a difference between .223Rem and 5.56mm(Nato), this article from 6mmbr.com sums it up.
"
.223 Remington vs. 5.56x45--Chambering and Throat Considerations Is the .223 Remington the same as the 5.56x45? The answer is yes and no. There ARE differences between the .223 Remington as shot in civilian rifles and the 5.56x45 in military use. While the external cartridge dimensions are essentially the same, the .223 Remington is built to SAAMI specs, rated to 50,000 CUP max pressure, and normally has a shorter throat. The 5.56x45 is built to NATO specs, rated to 60,000 CUP max pressure, and has a longer throat, optimized to shoot long bullets. That said, there are various .223 Remington match chambers, including the Wylde chamber, that feature longer throats. Military 5.56x45 brass often, but not always, has thicker internal construction, and slightly less capacity than commercial .223 Rem brass.
Should you be worried about shooting 5.56x45 milspec ammo in a .223 Remington? The answer really depends on your chamber. 5.56 x45 ammo is intended for chambers with longer throats. If you shoot hot 5.56x45 ammo in short-throated SAAMI-spec chambers you can encounter pressure issues. The new long-throated 'Wylde' chamber allows safe use of military ammo. Wylde chambers are quite common in Rock River guns. Other manufacturers, such as Fulton Armory, offer modified "match chambers" with extended throats that allow safe use of 5.56x45 ammo in .223 Remington rifles. For a complete discussion of the .223 Rem vs. 5.56x45 question, read this
Tech Notice from Winchester, and this
GunZone Commentary by Dean Speir. Without belaboring the point, we'll repeat the official SAAMI position: "Chambers for military rifles have a different throat configuration than chambers for sporting firearms which, together with the full metal jacket of the military projectile, may account for the higher pressures which result when military ammunition is fired in a sporting chamber. SAAMI recommends that a firearm be fired only with the cartridge for which it is specifically chambered by the manufacturer."