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Doing the Gun Stats for the Royal Ordnance Quick-Fire 20-pounder.
I'm getting the penetration numbers I expected, but not the ranges.
I am accustomed to sabot rounds outranging the full-bore rounds.
This is not true for APDS vs AP.
APDS Mk.1 gets 6dx19(2) pi++ to 5,000/24,800.
Shot Mk. 1 an APCBC (AP in GURPS) gets 6dx11(2) pi++ to 11,600/38,000.
So I dug into it. Turns out it's correct. I did not expect that.
It repeats with the 105mm L7/M68 gun.
M392 APDS has a range of 4,300/19,000. M456 HEAT has 7,900/23,200.
"Normalcy" is restored when I did the M735 APFSDS round and got 11,500/34,000 for range.
It makes sense. The penetrator on an APDS round is relatively short and it's very light compared to the full-bore rounds. It has a poor ballistic coefficient, more drag means less range.
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