Conical Chamber Offerings

I currently only have one pipe with a conical chamber and I really enjoy how it smokes. It being conical was somewhat of a fluke as most website descriptions or ebay postings do not specify what type of chamber it is.
The pipe I have is somewhat of a Danish inspired bull-dog. From what I have read it would seem that the conical drilling is a little more common with a Dublin style of pipe or some of the Danish freehands.
Are there any mainstream factory offerings that have a conical chamber, or are known for them?(I feel like it is a little more of a precise process so I could see factories potentially avoiding them for that reason)
Ideally I would be looking for a lumberman/lovat style as that is my favorite, but I don't have a Dublin yet so if they are more common in that design I wouldn't be opposed. I just don't know how to find which pipes have them other than asking people currently in possession of them.

Awesome, thanks for the feedback; sounds like a Dublin needs to get added to my PAD list.
Edit: Might have to add on a Zulu for good measure too

Uneven caking can be especially problematic

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Interesting, I haven't smoked the one I have enough to see if the cake is favoring a side, but I see where that could be an issue. Plus, the shape is not very conducive to using a run of the mill reamer. Likely have to bust out the trusty swiss army knife, which is fine.
I would also be curious if anyone has come across any of the science between one style of chamber vs the other? I feel like the conical would promote a more even air flow since the air would likely concentrate to a single point which also happens to be right where the draft hole is. Whereas, I feel the cylindrical chamber would cant the airflow more towards the side which the draft hole is(potentially causing an area of turbulence). In the grand scheme of things, it is likely negligible, since you wouldn't be drawing fast enough or hard enough to see the effect(or at least shouldn't be).
I just ask more out of curiosity. While searching through past threads to see if this had been addressed I came across a thread mentioning opinions regarding conical chambers having less dottle and burn through all of the tobacco. That sounds like a more efficient burn, which gets me thinking about a more efficient airflow. I get it; causation vs. correlation, but some of that got my brain noodling so I figured I would add the question on.
After looking around I think I am going to go with an unfinished Savinelli. I was looking for an excuse to pick one up from the feedback people gave them in another thread. I just didn't know which shape to go with at the time(excited that they don't put a filter on that shape). I would prefer acrylic, so was also looking at a Stanwell too; but, Stanwells should be on sale later this year so I will hold out until then. That is if I like how the shape smokes with the Savinelli.( in case you guys were wondering)

Awesome articles misterlowercase, thanks. I am going to have to bookmark that site for further exploration.
Thanks, sablebrush52; I might have to add that to my cart. , also, the inner child in me got a giggle that the name of the reamer has "butt" in it. My memory is so bad that I could see myself walking into a B and M and asking if they had any butt reamers. Oh, the looks I would get