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I have looked all over and cannot find any Pak 38 or any 5cm gun with that Muzzle break. The Pak 38 and the 234/2Puma had a double baffle with the second baffle larger than the first . This Pz III pic has a baffle the exact opposite the second baffle is smaller in dia than the first baffle . Also have read that the long barreled 50 mm gun prototype was first shown to Hitler in March of 41 , if this very first long 50 was the Pak 38 then this picture has Vorpanzer wich was not installed until March of 42 . I must admit I have been studying this subject all day and still have many questions and unsurities about it . There just is not any real good info on this matter to make a positive decision in my opinion and until I am shown positive proof that Jentz is wrong I will trust his knowledge. Also the pics that David posted and you keep referring to and claiming correct , I never saw what reference they actually came from? I looked up Waffe 0725 and Pz III squeeze bore and anything else I could on the web and found many diff thoughts and notes but none were actual references. I do know that Both Jentz and Spielberger both state that the Waffe 0725 was experimentally mounted on the Pz III. I do not know the actual facts on this but I do know what I have read from very reputable sources. Bob I truly am in great pleasure in talking about this and do not wish to appear rude in anyway I actually love investigating such things and I do find Pros and cons on both sides of our debates and hope that more real info can be obtained. Take care and happy modeling.
Brian
At this point, it seems that we may be "debating" two or perhaps 3 different things all within one discussion!
Let's separate out things a bit: 1) The pics posted of that oddly-armed Pz III with some sort of long-barrel gun with a mono-baffle muzzle-brake - and how it is identified, 2) the existence of some German WWII 7.5cm taper-bore (or squeeze-bore) AT gun, and 3) the particulars of some "experimental gun" called "waffe 0725".
The first item was a likely reality - there was indeed at least one Pz III apparently armed with some tapered-barrel (NOT confused with taper-bore) long gun with a fairly conventional-looking mono-baffle muzzle-brake. That's the subject David seeks to build. That configuration appears to have existed - so the appearance can at least be potentially modeled. The debate for the modeler would be how to get the barrel - as it looks to be more the size of a PaK 38 than a PaK 40, one could at least consider appproaching that configuration as "a 5.0cm PaK 38 or similar-sized gun and style" mounted on his Pz III.
The second item - 7.5 cm PaK 41 - is pretty well documented and there exist numerous photos of the Krupp gerlich-principle 7.5cm tapered-bore gun. And at least one available specimen (Ft. Nelson, BC, CAN.). That is the ONLY 7.5cm tapered-bore gun ever remarked on or described in any reference site I can find. That PaK 41 gun was larger than a 7.5cm PaK 40 (170+ inch barrel compared to 146 inch PaK 40 barrel) and way larger than any PaK 38 (126 inch barrel), as heavy as a PaK 40, and came with a very special and different barrel configuration (no external taper, sectional tube, atypical muzzle-brake), very different mount, etc. The PaK 41, while rare, is well-described and documented and there exist several photos of them in service and parked. ALL photos conform to that Ft. Nelson specimen in appearance. This was the only reported 7.5cm tapered-bore weapon... Notably, this gun cannot be visually confused with the gun on any Panzer III or IV photo that is posted here (and I've not found any photo showing this gun ever being tested or mounted on any tank.) It should be pretty apparent to all that whatever that gun on David's Pz. III was, it was NOT any 7.5cm PaK 41 Gerlich-principle gun. Ideally all debate of that should cease!
The third item - "waffe 0725" - is a different matter and, as there is no available info nor documentation, other than that photo, to access about it, something of a rather pointless diversion, here. Nobody can say with any certainty WHAT w-0725 was. And as that photo comes from two different places with two different stories... all are left voting their preference opinion about which story is right and none the technically-wiser after voting is done! Seems pretty idle, if you ask me!
So... the tank with its odd-looking gun was real, and that odd gun not being a PaK 41 also evident and real, and no other 7.5cm taper-bore gun being reported is evident and likely real- we are left to massage our thinking, here.
Did someone actually try to make ANOTHER 7.5cm taper-bore gun - a "competitor design"? I suppose anything is remotely possible, but as Krupp had the monopoly on the Tungsten, Dr. Gerlich worked for Krupp, and Krupp built that PaK 41, it seems unlikely that there was yet another made by someone different. No record appears to support that in any way. One might also consider why Krupp built that PaK 41 the way they did - sectional barrel, no external taper, etc. Making a taper-bore is very difficult and costly, and being larger did not simplify things. Krupp didn't make this thing so large or with such a complex barrel design because they wanted to impress someone. The "monobloc" construction used on the much much smaller 28/20mm s. PzB 41 squeeze-bore gun was apparently not practical for this larger-cal gun. It would be mighty odd that someone else could have somehow quietly (and without any apparent record!) made a smaller (presumably also lighter...), simpler 7.5cm monobloc taper-bore gun. And, for our discussion here, we NEED to posit that someone did do just that, IF we "want" that Pz. III "w-0725" pic to represent an "experimental 7.5cm tapered-bore gun"! If this alternative design were smaller and lighter and simpler to make, folks probably would have "jumped" on it, and surely we should be able to find out about it? But whatever the real case was, we currently know nothing, and may never know much, about that "waffe 0725", whatever it may have been.
Cheers!
Bob