HSTV-L has an undeveloped ammo

Could anyone link the source that states the penetration for the XM885 Delta 3?

According to this congressional testimony:
Department of Defense appropriations for 1984 - Google Books
There were two APFSDS rounds for XM274, Delta 3 and Delta 6.

The Delta 6 round could pen 430mm according to this congressional testimony:
Defense Department authorization and oversight - Google Books

So by process of elimination, Delta 3 is the lower performance round that performs like M774 according to sources like this:
Jane’s Armour and Artillery - Google Books

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If I remember correctly as well, Delta 6 could only be used by the XM274 gun. The problem is, what tanks use which guns is pretty vague. Some sources say the HIMAG used the XM274, but others say that the HSTV-L used XM274 as well, I’m not really sure.

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IIRC from a spookston vid a year or so ago, he did sent in a bug report with primary sources from declassified files about it for the HSTV-L and RDF/LT and gaijin’s respond was they didn’t Believe the longer darts could fit. the fact don’t care what someone believe but they went Nuh Uh and that was the end of it as i recall

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Its very clear. HSTV-L and all of the RDF/LT variants use the ADMAG(Advanced development) system developed under the MC-AAAC program. The XM274 evolved from the ADMAG in the early eighties, primarily by lengthening the chamber by 3 inches from 16" to 19".
And yes the Delta 3 and 6 variants are for the XM274 which unfortunately was only ever mounted on a LAV:
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Gotcha, would you happen to know what gun HIMAG or ELKE used?

Same gun as HSTV-L:
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