take the guts out of the mag, load the mag to 30 rounds, then drill and insert a pin to prevent the follower from going any lower (just make sure you don't pin the spring in position)
Alternatively, remove the spring and backfill the back so the spring is fully compressed when you load 30 rounds
You could also use a loading tube instead of a speed loader, that's how I load all my PTW mags to 50 rounds precisely. I agree it's very difficult to do with a speed loader
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