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/.... I have a model 60 and a 4" model 10 and that is what I have been carrying. They work ok for me, but I keep wishing to find something in between in size. ...//...
The OP didn't mention the barrel length of his model 20 but it makes a difference in terms of terminal ballistics. I get an average velocity of 1250 fps with my .357 Mag self defense load in my 3" Model 20, but only 1180 fps in my 2.125" Model 60.
It doesn't make a difference however in conceal-ability or carry comfort, so the 3" is a much better choice than the 2.125".
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/...Your best choice would be--is the M-60 in .357 Magnum, but with such a short barrel, and only 5 shots it really offers nothing "over" the G-36 save for reduction in technocomplexity...basically you can load it and leave it without ever worrying about pumping one up the pipe, checking, or clearing, etc.
Your specified parameters indicate the G-36 was the ideal choice to begin with, though the G-30 would have given you a 40% boost in capacity for the cost of virtually nothing other than marketing hype to sell you an almost imperceptibly "slimmer" handgun holding very close to HALF as many rounds.
Please consider that for all this you could just as easily be carrying the G-29 10+1 stoked with 700 fpe rounds, AND stuff it with 15 round mags for 16+1 in a package not really any more difficult to conceal than the M-60.
Your post brings up a great point - one that you seemed to have missed in one of my earlier posts, or perhaps you just don;t get what I said.
If we look at the dimensions and weight of these handguns we'll form some conclusions that are just not correct.
Model 60 3" = 5" x 7.7" x 1.3", and 26 oz (loaded)
Glock 29 = 4.4" x 6.9" x 1.3", and 33 oz (loaded)
Model 66 2 1/2" = 5" x 7.7" x 1.4", and 36 oz (loaded)
This would give the impression that the G 29 is no harder to conceal than the Model 60 as it is 3/4" shorter in length than a 3" and only slightly longer than a 2.125", a half inch shorter in height, the same width, and only 7 oz heavier.
However, the Model 60 only has the 1.3" width at the cylinder while the G 29 is more or less that thick through the entire slide and grip, giving it much more volume, which makes it much harder to conceal. It is also 7 oz heavier, and 7 oz can be noticeable in all day carry. That 7 oz however does help tame the recoil.
Now let's make the same comparison between the 2 1/2" Model 66 and the G29. The Model 66 is again 3/4" longer, a half inch taller and only .1" wider. And again the width of the Model 66 is only in the cylinder - the grip, frame and barrel are all substantially thinner, giving it much less volume. Finally, the Model 66 is only 3 oz heavier.
I can't give you a first person comparison of the Model 66 and the Glock 29 as I've never carried the Glock 29, but I can give you a real person comparison of the Model 66 and the CZ 75 P01
The CZ 75 P01 is 7" x 5" x 1.3", and 34 oz (loaded with 15 rounds). It is the same length as the Glock, is once again .5" taller, and only 1 oz heavier.
I've found the Model 66 to be much more comfortable to carry than the CZ 75 P01 in all day IWB carry and I've found it easer to effectively conceal due to the smaller over all volume.
For self defense purposes, I also prefer 6 rounds of .357 Magnum that can be accurately and effectively delivered from a K-frame sized pistol to the 15 rounds of 9mm para in my CZ 75, despite the superb reliability of the CZ 75.
.../ was hoping to find at least a 6 shot, around 25 oz with a 2-3 inch ...//...
That's probably not going to happen, and if you found it, you've still got a 25 oz .357 Magnum that is a bit much to shoot effectively and will have an alloy frame that won't stand up to extensive practice with full power rounds.
You can however accept another 10 oz or 14 oz of weight and get a six round 2 1/2" Model 66 or a seven round 2 1/2" Model 686 Plus that can be very effectively shot with full power .357 Magnum loads. It will also still be easier to carry and conceal than a compact model Glock (and without the other issues of carrying a Glock concealed).