Last week I stumbled across an auction listing for some 5.7x28 custom loads by Vanguard Outfitters out of Plant City, FL. The projectile is a machined solid copper which looks suspiciously like the Elite Ammunition “T6” load. I emailed & called the seller and learned that it is the son of the proprietor at Vanguard Outfitters who loads these and has the projectiles custom made (he didn’t say exactly who made them). He told me about the slight differences in his projectile vs the Elite T6, which visually all occur below the case neck, and also that his projectile was 34gr, as compared to lower grain weights from the T6 which were 25gr or 28gr.
The overall cartridge weight of the V57 is 103.5gr, as compared to the typical overall weight of an Elite T6 which is around 92.5gr to 96gr. Aside from the weight difference, the only visual difference I saw was that Vanguard is using gold-colord primers, while the T6 loads I have are silver-colored (they are both on FN brass). The bullets are not AP per-se (by BATFE definition) as they are 100% copper, but the shape, relative hardness, and velocity of both these types lend towards easily defeating soft body armor and many other obstacles.
At their link, Vanguard claims a velocity of 2150fps from a FiveseveN pistol, and 2825fps from the PS90 rifle:
The listed velocities from Elite’s T6 are higher with their lighter projectile. Elite ammo (Jay) is one of our members here, and he might chime in. Some photos below show the cartridges, pulled bullets, box labels, etc. I show the Elite Ammo T6 25rd blue plastic box for comparison. The Vanguard box is a seemingly oversized box of 50rds.
In this photo the V57 bullet tip at left looks slightly bent… That was from me dropping it.