Lew and Leon - I don’t know anything about any “SOCOM” LP-FMJ 124 grain round by Federal, and am a bit confused by the description “FMJ” with a white-plastic nose cap. If it has a white-plastic nose cap, then it is not a FMJ bullet.
However, this sounds like the Standard commercial Federal Index PD9CSP2H 9mm EFMJ (Expanding Full Metal Jacket) round introduced in the 2000 catalog and still shown in the 2009 catalog. It has a 124 grain flat-tip
bullet that is just short of semi-truncated in shape. Underneath the jacket, at the nose, is a white plastic filler. At the bottom portion the plastic piece becomes conical with the pointed end pointing to the rear. The bullet also has a conical-concave base. On the flat of the bullet nose is stamped the letter “F” for Federal. The bullet nose is interest, as while, of course, the bullet is round right up to the nose, the nose itself has six flat sides. Headstamp is "FC 9 MM +P. The case and primer cup are nickel and mine has no case cannelure. It also has no visible primer seal.
Someone told me they dropped the “F” from the nose tip, but I have not seen any of this in awhile, and I don’t know if that is true or not. Seeing is believing.
They originally came fifty rounds to a box under the “Premium line” (Blue and gold box). I think the current packaging is different, and perhaps a lesser quantity.
The 2000 catalog’s introduction blurb on this projectile says:
“This revolutionary design combines a scored full metal nose over an internal rubber tip that collapses on impact. It assures expansion on every shot. A base lead core assures weight retention.”
Regarding the “scored” nose, on mine, I can find no evidence of any pre-fracture cuts of any kind.
Don’t know if this whole thing is on subject or not, since I know nothing of the round Lew describes.
Edited solely to remove the myriad of typo errors I made - information is the same.