I may be cynical - but you are probably better to buy a new gun with chokes and thenm do the work reloading and /or pattening... if you really feel you need screw-in chokes atall.
I think alteration of shotguns is best left to the skilled regulator/gunsmiths, who always specify for their guarentee shot size and loads specificially for a client requirement previously agreed upon.
To do otherwise or even DIY is very hit-or-miss but probably fun if you have the time and money.
Apart from very specialized applications( EG in competition )where ANY mental or other edge is so important, I feel that a lot of the currently trendy back-boring/cone/choke and barrel work is like a lot of expensive and unneccessary fishing lures...designed to catch more fishermen than fish!
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***Big Bunny***
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