In fact, there are handguns in 5.56X45. I don’t know about the Grendel or the 6.8. I wouldn’t be surprised that the T/C Contender pistol has been chambered in about every caliber imaginable, so most any round could be considered a pistol round by that measure. As the Grendel and 6.8 are used in M16 designs, I assume there are short M16-type pistols in those calibers out there also.
The official definition of AP ammo is at 18 USC sec. 921(a)(17), which you can Google.
Below is something from Elite:
BATF Classifies .223, 6.5 Grendel and 6.8SPC as Pistol and handgun ammunition
July 11, 2011
BATF and EA Recent Finding.
EA has had to remove our Trident bullets in .223, 6.5 Grendel and 6.8 SPC. The BATF has ruled that all of these cartridges are now pistol cartridges. Since they are now pistol cartridges their construction now falls under the content and construction limitations of the 68 GAC and pistol cartridges.
Currently from other bullet makers like Barnes, solid .223 caliber bullets are still being manufactured and sold . We are working with our BATF IOI person to find out the following,
A) Is Barnes bullets and all other maker that constructs solid bullets in .223 going to have to stop.
B) If not then why do we have to stop since out basic shape and metallurgical content of our PFP bullets are the same as theirs?
C) Since they are now handgun caliber limited how does Magtech solid copper pistol bullets not fall under the 68 GAC as AP?
D) If Solid copper is not considered a violation of the 68 GAC in handgun bullets then it should also be not a violation of the 68 GAC to make EA’s PFP bullets from solid copper as Magtech does.
Those who have T6 ammunition and PFP bullets will be contacted by the BATF to recover any bullets or ammunition that have not been FIRED yet.
I apologize for this inconvenience and hopefully we can get this matter straightened out one way or another.
Pr. Elite Ammunition