While I sit here anxiously awaiting the delivery (sometime next week I hope) of my a new-to-me 1993 CPA .32-40  I have a question. I know when you go from smokeless powder to black powder in a rifle you need to clean out all the "modern" solvents and oils because they will gunk up badly with black powder. One of the selling points of the CPA is the ability to switch barrels. I also know the action in a single shot should contain the fouling pretty well and of course any black powder or smokeless fouling will remain in the barrel it is shot in. 

So here is the question. If I shoot a black powder cartridge and then swap the barrel for a smokeless I should be able to get away without any major "gunk" building up in the action, correct? I plan to use Ballistol to clean the breech block and receiver so I don't think it will be an issue but I figured I would ask. I could see using the same receiver for both rimfire and centerfire barrels at a match since I can't afford a second receiver and stock at this time.

Thanks for fielding my rookie question.

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I didn't know that! Thank you very much for the response. I figured that swapping black powder and smokeless powder barrels thoughout the day wouldn't be a problem but after the Ballistol tip I'm glad I asked.

No worries on switching black to smokeless powder.  The action does not get much residue and does not need to be cleaned at the range, except.  If you are breech seating and dump a load of powder in the action it will shut it right down.  Have done this with my CPA's a couple of times.  I always keep enought tools to strip and re-assemble in my shooting box.  This week I dropped an empty .22 case in the action and it locked things right up until I stripped it down and removed. Somehow the closing breechblock bent the case and jammed things up good.

My  black powder barrel has to be real clean shot to shot so cleaning it after shooting does not take much work.  That gunk clean up applies mostly to muzzle loaders shot a lot and cleaned seldom. Could tell some stories about one of my old friends that muzzle loader hunts once a year and only cleans the rifle night before.  Shooting like we do clean up is not a problem

On Balistol. Have read some reports about it.  I have used it 100% on my two CPA's one over 15 years old the other about 10 with no problem.  Speculating only the "case" you see on modern reproductions is not case at all but applied finish and can wear off, also not applied very well in some cases. 

Any solvent has it's vices and best used to clean then wiped clean and dry after.  In my actions I don't use much lube at all. Some grease on the heavy load surfaces small amount only. Triggers and firing pins none at all.  Outside I apply plain clear floor wax.  Other thing is Oil or lube will surely mess up the Pope rib on external adjustment scopes, sticky they don't return to battery properly and cause off shots. Clean and dry is best.

Boats

When I shoot Black, usually Duplex with 10% Smokless. When I am done I shoot a half a dozen straight smokless shots thru and this cleans the barrel very well. Have not had any problems with fouling issues. But I do use the same Lube (Pope Formulae) for both Smokess and Black Powder loads. I would make one note. I have found that with Black Powder as the Bore size goes down (Smaller) the fouling issue gets bigger. For 32-40 I have found that wiping between shots is necessary between shots for best accuracy. Duplex loading helps but wiping works better. After having shot Black and blowing out the fowling with my smokeless loads I then clean normally with Hopes #9 and leave the Bore swimming in #9. When I get home I park the Rifle for two day's and then clean again with Hoppes. Have not hurt a Barrel using this procedure in nearly 40 years. HTH, Regards, FITZ.