Eh, when in doubt, go to the Finns. They certainly had early experience with the Soviet weapons and ammunition...regarding the F-22...or as they call it...76 K/36 "Rotanhäntä"
As noted Finnish military mostly used same ammunition was used for antitank use in all 76.2 mm x 385R calibre field guns, but some of the details (such as muzzle velocities) varied from one gun model to another. 76 K/36 had the longest barrel from all 76.2-mm field guns used by the Finns, which is also quite evident in muzzle velocities produced by this gun with most available ammunition. Information about antitank-ammunition for this gun:
76 psav: Old (likely pre-WW2) solid-shot capped armour piercing round with 6,26 kg projectile and about 650 metres/sec muzzle velocity. This may have been old Russian ammunition captured in 1918, it is not listed in oldest Finnish ammunition manuals, but does appear in manuals introduced in 1941.
76 l vpstkr 23/29-ps MD-5: Captured Soviet round with BR-350 armour piercing high explosive ballistic capped tracer (APHE-T) projectile, which weight 6,4 kg projectile and had 677 m/sec muzzle velocity from this gun. Added to Finnish manuals 1st of May 1942 (probably captured earlier).
76 vpstkr 23/29-ps MD-5: Captured Soviet round with BR-350A armour piercing high explosive ballistic capped tracer projectile with ballistic cup (APHEBC-T). Projectile weight 6,4 kg projectile and 677 m/sec muzzle velocity from this gun. Added to Finnish manuals 1st of May 1942 (probably captured earlier).
76 pstkr 23/29-ps MD-5: Captured Soviet round with BR-350B armour piercing high explosive ballistic capped tracer projectile with ballistic tip (APHEBC-T). Projectile weight 6,4 kg projectile and 677 m/sec muzzle velocity from this gun. Added to Finnish manuals 1st of May 1942 (but almost certainly captured in 1941 or earlier).
76 psa - Vj4: Finnish armour piercing capped round with 4-second tracer (APC-T). Projectile weight 6,325 kg. Reduced propellant charge version had 403 m/sec muzzle velocity, while full propellant charge version achieved 695 m/sec. Added to Finnish manuals 1st of December 1942.
76 hkr 42-18/24-38: HEAT shell with German Gr. 38 Hl/B warhead. Projectile weight 4,8 kg and muzzle velocity 400 m/sec. Added to Finnish ammunition manuals 1th of July 1944, but may have arrived bit earlier.
76 hkr Vj 42/C-18/24-38: High explosive antitank tracer (HEAT-T) round with German Gr. 38 Hl/C warhead. Projectile weight 4,8 kg and muzzle velocity 400 m/sec. Added to Finnish ammunition manuals 1st of July 1944, but probably arrived few weeks earlier.
Finnish military also had incendiary ammunition for 76,2 mm x 385R calibre field guns. Both incendiary shells used by the Finns were captured Soviet equipment containing thermite and blackpowder.
As shown by test results 76 psa - Vj4 AP-T tracer round had much more armour penetration capability than previous AP and APHE rounds. This AP-T round was added to Finnish military manuals in 1st of December 1942 and with it 76 K/36 would have been effective weapon against Soviet T-34 tanks, even if it was very rarely used for antitank use. Until introduction of 75 PstK/40 (7.5 cm Pak 40) to Finnish inventory in May of 1943, this field gun and 76 ItK/31 ss and 76 ItK/31-40 ss anti-aircraft guns were armour-penetration wise most powerful guns in inventory of Finnish Army available for antitank-use. Finnish military also had incendiary ammunition for 76,2 mm x 385R calibre field guns. Both incendiary shells used by the Finns were captured Soviet equipment containing combination of thermite and blackpowder.
