Help Identifying This Round Please

Round is 40mm dia. x 132.5mm Weight is 1.047 Kg or 2 Lb 5 oz
Markings: A.P. 2 PF DT. H.Ltd 800 2. 41 FG 334. 4 P1/142/900
R 800.2


Looks like one of the 40x304R 2Pr Tank/Anti-tank projectiles APT.
The Mk should be before the T in the photo. Flash makes hard to read.

Just for propper terminology, this is a projectile, not a round.