Are there any penetration charts
All discarding sabot rounds for le.Fh., s.Fh. and PAK44 are based upon the standart mass produced 75mm Pzgr39 and 88mm Pzgr39 series AP ammunition and converted with discarding sabots to fit 105mm, 128mm or 150mm barrels to be discharged at an elevated velocity. There are plenty of penetration curves available on this side for these AP bullets, which show You the relationship at which velocity what penetration can be expected. For this reason I refer to those posted previously in the various threads here (see attchment). From my perspective, there is absolutely no conspiracy or mystery about these shells AP-performances and no surprises were encountered in the Hillersleben prooving ground trials in this regard.
10.5cm le.FH.18: The elevated velocity virtually transferred the 10.5cm l.Fh.18 firing 10.5cm Pzgr39TS performancewise into a PAK40, firing a 7.5cm Pzgr 39 in it´s sabot at a muzzle velocity of 765m/s. 30° penetration at 100m: 99mm RHA; 500m: 88mm RHA; 1000m: 76mm RHA.
15cm s.FH.18: The elevated velocity virtually transferred the 15cm s.Fh.18 firing 15cm Pzgr39TS performancewise into an high performance anti tank gun, right in the middle between the 88mm KWK36 & 88mm PAK43 but with somehow worse accuracy, firing a 8.8cm Pzgr 39 in it´s sabot at a muzzle velocity of 880m/s.
30° penetration at 100m: 155mm RHA; 500m: 140mm RHA; 1000m: 126mm RHA
12.8cm PAK44/KWK44: The elevated velocity finally significantly enhanced the 12.8cm PAK44/Kwk44 firing 12.8cm Pzgr39TS, firing a 8.8cm Pzgr 39 in it´s sabot at a muzzle velocity of 1230m/s. Initially, problems were encountered with the 8.8cm Pzgr39 used here and the very high striking velocities against plates thicker than 200mm (some of the projectiles broke up). This occurance of unexpected projectile break up in this specific case is probably the source of all accounts claiming that little improvement was to be gained by these shells.
In fact, the increases of low range break up events at extreme velocity (the 88mm pzgr39 ammo stocks used in the 1st trials were falling into some kind of shatter gap here) indeed caused something of a discussion in WaPrüf whether or not the penetration does increase ever on linearely with velocity or plateaued off at very high velocities due to break up. A second series of trials in Hillersleben in autumn 1944 showed that the problem was the worse quality 88mm Pzgr39 ammunition used in the first set of projectiles, which did not gave the best performance obtainable (8.8cm Pzgr39 from the Bochumer Verein in the 2nd trials stayed intact at up to 1250m/s and started to break up at >1300m/s when fired in sabots). Notice that these extreme velocities were, of course, far beyond any proof specifications for these projectiles and entered a new terretory. Projectiles to be fired for these velocities would have required updated proof specifications in order to guarantee intact penetration. These improved -DS projectiles also seem to have been fitted with a somehow thicker and blunter type of cap with the fwd sabot rings attached to the cap- unlikethe lower velocity 15cm/8.8cm Pzgr39TS, which used & converted the complete 8.8cmPzgr39 with it´s thinner, and sombrero-shaped cap. I would suppose that the thicker cap (compare attachments: NOTICE, I edited the graph to show the line between cap and projectile body, which is not shown for security reasons in it) does help a great deal in negotiating more severe conditions of impact (e.g. elevated velocity) for mass produced shells. The same result could probably be obtained with more careful heat treatment and thinner caps -as evidenced by the shells made by Bochumer Verein- but these results would be less reliable in mass production than for thicker capped AP.
30° penetration at 1000m: 264mm RHA*; 2000m: 230mm RHA*
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