Accuracy was reasonable.I wonder what the accuracy of these were? It would be another antitank solution for weapons like the StuH and Wespe and the artillery howitzers. The HEAT round for these weapons would be powerful also but somewhat range/velocity limited.
According to BAMA RH8 -1326´s tabulation titled "Übersicht über TS-Geschosse im Vergleich zu Normalgeschossen" dated 29th of sep. 1944:
service 10cm Pzgr39 TS (subcalibre: 7.5cm Pzgr39 for leFH18)
muzzle velocity: 765m/s (fired from le FH18)
reliable Penetration (Vh for five consecutive penetrations) at 60°:
100m: 99mm RHA
500m: 88mm RHA
1000m: 76mm RHA
Accuracy:
50% zone of impacts at 1000m:
Höhe: 40cm
Seite: 50cm
(for comparison, the same table lists l.FH18 firing 10cm Gr.39 Hl. Ausf.C with a 50% zone of impacts at 1000m:
Höhe: 100cm & Seite: 43cm)
15cm Pzgr39 TS for sFH18:
muzzle velocity: 880m/s (fired from s FH18 with subcalibre 8.8cm Pzgr39)
reliable Penetration (Vh for five consecutive penetrations) at 60°:
100m: 155mm RHA
500m: 140mm RHA
1000m: 126mm RHA
Accuracy:
50% zone of impacts at 1000m:
Höhe: 50cm
Seite: 57cm
notice: 10.000 15cm Pzgr39 TS rounds were operationally field tested at the Eastern Front from 20.10.1944 to 1.11.1944.
12.8cm Pzgr39 TS for PAK44 and KwK44:
muzzle velocity: 1230m/s (fired from PAK44 with subcalibre 8.8cm Pzgr39)
reliable Penetration (Vh for five consecutive penetrations) at 60°:
1000m: 264mm RHA
2000m: 230mm RHA
Accuracy:
no data
according to the commentaries, the accuracy was lower for TS projectiles with a larger difference between bore- and subcalibre.
I have attached the engeneering drawing for the 10cm Pzgr39 TS as in service by end of 1944 in this memo (primary source, unpublished).