I played with them a few years back.
Tried a couple of different powders but settled on Hodgon Benchmark at 26gns and they were travelling between 3500 and 3550 from my T3 (1 in 12) and were a great round for rabbits and hares performing better than expected. Contrary to the norm they also performed in my SL8 with a quick 1 in 7 twist before it was skipped.
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