The conical bowls are often used in Dublin type shapes, which are narrow at the bottom, so a Stanny 217 for example, or the Hans Christian Anderson shape 2 (calabash) feature it. I'm in no position to comment on every Stanwell ever produced.
A lot of the egg-shaped freehands from Jobey Dansk's to Stanwells to various high grades, etc, Preben Holm.... all traditional Danish shapes will have that conical bowl.
How do you tell - well, I don't know if there's a rule, but if you stick your finger in your pipe and you can feel the bottom of the bowl at all points, it's probably fairly round down there. If your finger gets pinched by the sidewalls and can't get right to the bottom it's conical or tapered.
Skip, I don't really know what Caminetto does for bits. The Italian pipes I have all have pretty blunt bowls. Likewise, the brandy in question is NOT a tapered bowl (no reason in a brandy shape), so it's a Danish looking pipe with English guts, so to speak.
The packing method outlined works in every pipe, but it seems like a very natural fit with a tapered chamber. What it amounts to is having the tobacco compacted side-to-side rather than up-and-down, and I think the Frank pack accomplishes a similar thing, which is why you can pack so tight and still have a perfect draw.
Anyway, as with all things pipey, your mileage may vary, see dealer for details.