Another vote for the Nikkor-M. Nothing much to add beyond what's already been said; it's simply a fantastic lens, and very popular for a reason.
Something to consider, while I do not know how often they can be found in shutters, Red Dot Artars can be found at 12" (305 mm) and 273 mm and 355 mm. They are f/9 lenses. Very sharp.
https://www.pacificrimcamera.com/rl/00256/00256.pdf
"Landscapes exist in the material world yet soar in the realms of the spirit..." Tsung Ping, 5th Century China
No reason not to be! Even uncoated, with a lenshade one should be fine. I found a 1951 Goerz catalog on the Apo Atars (below). Designed to handle 1:10 like the later RDs. The next page of the catalog described the Gotar -- same basic design, but optimized for around 1:5 to 1:1
There is a slight difference between the RDs marketed for graphic work and those put in shutters (judging from the above link and one I found from around the same time) -- the shorter focal lengths RDs in shutters were optimized for 1:20 instead of 1:10. Coverage remained the same. All the RDs seem to have been coated.
"Landscapes exist in the material world yet soar in the realms of the spirit..." Tsung Ping, 5th Century China
APO artar, excellent for color or B&W. This design goes back decades with remarkable optical performance. In shutter or barrel version makes no significant difference at infinity to life size 1 to 1.
There was a time when most stayed away due to their smaller image circle -vs- focal length. If used as a longer than normal focal length lens, vast majority of the time, their smaller spec'ed image circle is not significant. This market perception and vintage shutters kept their market value low for years.. until recently.
Much the same applies to APO ronar with the APO ronar being available in a modern shutter to vintage ones in compound and similar vintage shutters.
Bernice
Most ligtweight 300mm lenses have been listed already, but here is my take:
1. "Regular" taking lenses:
Nikon Nikkor-M
Fuji Fujinon-C
2. Process lenses that work just fine at infinity and are available in shutters:
2a: Dialyte lenses, 45-48° coverage:
Goerz Red Dot Artar
Schneider Repro-Claron
Schneider Apo-Artar
Rodenstock Apo-Ronar
Docter Apo-Germinar
2b. Symmetric Plasmat lenses, 65-70° official coverage:
Fuji Fujinon-A
Schneider G-Claron
Docter Germinar-W
Rodenstock also made the Apo-Gerogon in the last category, but they don't fit into shutters without machining.
300M Nikkors are easy to find at the moment, especially from Japanese dealers who list on EBay.
Seems supply is down, demand is up along with prices are up too. Not just the Nikkor 300mm f9 M, 300mm APO ronar in copal shutter and even APO artars have been affected by lower supply, high demand and higher market prices.
Seems more Foto folks are interested in this view camera stuff, which is GOOD as it goes a long ways to aid in the demand for sheet film and it's production-availability.
Bernice
One cheap alternative, though you've got to be ok with a dim ground glass, is a 180mm/315mm Schneider Symmar (not S) convertible.
I got one recently in a Linhof board for less than than $200., and the 315mm focal length (rear element only) is pretty good at typical f:22-32 range, and it's quite small.
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