One thing to consider when testing is that these bulbs are 30-40-50 years old and may not give off a consistent amount of light. I do a lot of flashbulb photography with Crown and Speed Graphics and find that exposure can vary widely based on the condition of the bulb. Try to find ones in original boxes that don't look water stained and moldy.

AG bulbs in a 5" reflector don't do so well. The #5 and #25 work really well in the 5" and I have success with the M2, M3, M5, M25 in an adapter in the 5" - my most common configuration is dual 5" flashes with M size bulbs. The Edison base (regular light bulb base) work well in the 7", but have not been happy with the smaller bulbs in the 7", even with adapters with long shafts that place the bulb in the middle of the reflector - the light falloff is severe.

For fast shutter speeds with M setting, the M series that are usable appear to be the M3, M5, and M25. The M2 box indicates it is good for X and M up to 1/30 of a second and M-setting cameras at faster speeds require an M3.