I have used the clear plastic overshot cards in 12 ga, work great, can at a glance tell shot size 7 or 8 from 5 or larger. Downside is the plastic litter although have never found a piece big enough to identify. Have not seen them in 10 ga.
I tried some 16 ga x 1/2" fiber wads (untreated) under a shot column in the 10 ga. w/ 1 1/4 oz They didn't "poof" but didn't sound and feel like a full charge round and burned very dirty. Same fiber wad IN the shot cup worked well, got me the same shot height for crimp, burned much cleaner. Have to think the result was a very low pressure round, too low to fully burn the powder. Shot both outta my Ithaca Mag 10 for test purposes, neither would fully operate mechanism, no surprise there.
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Threaded Mode