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I get pretty decent, if high-contrast results pushing 320TX and 400TX to 3200.

Pushing does increase grain; but using a larger format (6x7 or 4x5) reduces the apparent grain in resultant prints.

I can't say enough good things about HC-110 as a developer: pushes well just by increasing development time, shelf-stable for years as a concentrate, and not particularly toxic compared to other developers.

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Approximately never used anything larger than 35mm. I don't remember all the developers I used over the years (though I used D-76 for a lot of standard Kodak Tri-X ISO 400 stuff). May have used some HC-110 (forget when that came in), definitely Diafine/Acufine, probably something from Ilford after I largely switched to HP-5 film, some homebrewed stuff...

But it's been decades since I have done film processing. After I graduated, did a brief stint using an apartment half bathroom and drove me crazy after good school darkrooms.

[ADDED: I've never used B&W film emulsions from the past 40 years or so; they're presumably at least a bit faster than what I used. 1600 was pretty much the practical limit when I was shooting B&W on film.]

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