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https://steamuserimages-a.akamaihd.net/ugc/958590568452013890/FB3649E33364F56B803C41443660A88B300690FE/
A fake muzzle brake version: https://c1.staticflickr.com/2/1570/26095544910_fddf65c130_c.jpg
Considering that the 17 pdr's APBC could pen 163mm of armour at 500m, and the APDS (though inaccurate as fuck historically, not being fin-stabilised) could pen 256mm at 500m, it depends. If you just want to model APCBC, 3 blocks of heavy armour is quite accurate. If you want to model the gun's theoretically higher performance firing APDS, then it should be able to penetrate 4-5 small heavy armour blocks
The mass of a small heavy armour block in-game is 112 kg. The density of steel is approximately 7700 kg/m^3, and with a volume of 0.125m^3, you would expect a solid block to have a mass of 962.5 kg, implying that the block by volume is only 11.6% steel (or 89.4% hollow).
We have to make some more assumptions (!) here than I'd like, but based on those assumptions, 3 heavy armour blocks is only 174.5mm of armour.