Re: sabot rounds on 7TP
Just a little comment on the French 37mm L21 gun (SA18):
The round you have modeled as sabot (AP Pen 3) was in fact one of the first service APCR rounds for tank guns. The original AP round for that gun was a naval design dated to the 1800s (basically a simple steel shot) and had a much lower penetration, something like 10-15 mm at 100 meters (90 degrees).
Many countries which purchased the FT-17 after WW1 did not get the improved French ammo. Finnish tests of the original AP ammo showed that it was incapable of penetrating 10 mm armor quality plate at 100 meters and was therefore nearly useless even against lightly armored vehicles. The French seem to have realized that some time in the 1930s and went for the best possible AP round they could design for that gun, since they had it on so many of their light tanks. Muzzle velocity was 600 m/s, which was pretty impressive for that gun.
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