Long story (sorry)......... I need some help deciding what to do with my shotgun. Seven or eight years ago I bought an old Remington Sportsman 48 from a guy to use in three gun shoots at the local club. It had been cut down to 18.5 inches and the barrel was ported. It also had a Choate pistol grip stock added and a three shot extension tube. It was ugly as hell, but did the job. He got rid of it for a Benelli because it cycled too slow for him. I was never fast enough to worry about the cycle speed. I'm old and slow now and haven't had time to shoot three gun in years so the shotgun has been sitting in the safe.
I started looking around this forum about a month or so ago and it got me looking at that gun again. I hated the look of it so I went out and bought an original wood butt stock for it and refinished the wood. It's really looking good now and I want to improve it some more so here's the questions I have.
It is obviously a cylinder bore now and it patterns like crap. I want to tighten it up for more general use. I envision it as a HD gun, but with the ability to be used as a hunting gun in an emergency situation. I have contacted several companies about having it machined for Chokes. Carlson's thought that they could do it but decided that it was three thousandths of an inch out of spec (per our e-mail exchanges). I contacted Briley per Carlsons' suggestion and they say no problem, they can do it. So here goes.
1) Anyone have an opinion on Briley's work?
2) Is there someone else you recommend?
3) What three chokes should it get for general use?
I'm thinking cylinder for HD. Should I go improved and full for the other two?
Lets hear your opinions please.

Briley makes excellent chokes.  For HD, all you need is an Improved or Modified chokie.  No need for multiples.  But if you had to have multiple for some reason the three most popular are Modified, Improved, and Full.

With a shotgun, chokes come into play a little less with Buckshot and Slugs.  It has more to do with the ammunition you use for your gun.   If you want the best ammo available, try the Federal 00 Buckshot with Flite Control wads in it.   They are so accurate and shoot incredible patterns.   For slugs, get the Federal Tru-Ball slugs.  They are fantastic and very accurate.  Both of these can be bought from ammunitiontogo.com in the shotgun ammo section for a good price.

You may want to try the ammo first and see how it does in your gun without chokes.   You may be happy with it as is and not need to spend the money on having chokes installed.

Thanks for the reply gentlemen. I will definitely try different ammo first. Don't know how I missed the Box-O-Truth posts on the subject O_P. I always look forward to your tests. Again, thanks to both of you for the advice.