Dean
I have used FlexHones for over 20 years in several gauges. There is pushback from some smiths about them, but the problem is when trying to hone extremely pitted barrels they will sometimes leave a ripple. My personal opinion based on experience they only do this on a barrel that is well beyond honing and need to be reamed. They are available in several grits and come with detailed instructions which should be followed ( oil liberally and always keep moving, while limiting passes without checking).
That said, for a chamber that is just tight, I think the brake cylinder hone is your best bet. It will take off a small amount of metal and leave a polished surface. It may just need a polish. If it is a problem with profile which needs to be corrected, you may need to start with a coarse set of stones and switch to a light set when the shell extracts. If it is a profile issue where the front part of the chamber has an enlarged section, a ball hone won't help since it will enlarge all sections the same amount. I would try a little honing at the breech section first to see if that helps.
Also, I would try a bore gauge first and insert the gauge to the front of the chamber. Then carefully withdraw it and note if there is any point where the reading decreases below a previous reading. If so, a slight reaming may be the best answer.
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