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Have sent it to Serous shooters in Akld,. They have some form of ultra sound thingy ma jig. My local Gun Smith couldn't do it, and that was after putting it in a lathe. If the guys in Akld can't move it, then there's not much point getting one of those chokes I guess.
If you don't want the choke it should a simple matter to bore it out in the lathe.
Echo comments on a gunsmith to get choke out. As for the chokes advertised - no way of telling without actually using it with different loads and a pattern board. I never worried about fancy chokes as I'm always using different ammo for ducks, bunnies, parries, geese, etc ... so just stuck with the original manufacturers chokes. All the best ... Gunzrrr