22 Hepburn isn’t that the truth, when this game first really took off you could get in to a competitive rifle for 500 or so. Lots of us simply used the cross o inserts in our bpcr’s

Some things mitigate CPA expense. If you shoot CF & RF same action  substantial saving on action stock sights etc vs two guns They used to deliver unfinished stock at a lower price my first one came that way. Its BPC legal 38/55 & .22 LR 

2nd one was essentially free. Sold off number of guns I owned to pay for it highly finished from CPA. Saved even more later, it was a full offhand Schuetzen Pope style high comb palm rest 32/40 & .22 LR. When offhand competition dried up my area sat unused so converted it to a sporter style stock, now it’s allowed in a number of local offhand matches & would not be a disadvantage at ASSRA offhand matches. Grandsons shooting it well.

Most of my build on something original projects have been money losers when sold. If I had bought the very best condition original would not have been that way. The pair tof CPA’s I own would probably sell for more than I paid . Not as much more than Original Stevens high grade unaltered target gun though.

Boats

Don't forget C. Sharps who makes a very nice Low Wall.  Here's an article I wrote on the subject some time ago.  Page down to the section titled, Options for 22 BPCRA.

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Wayne

I think you should buy a 44 1/2 off Gunbroker.

My CPA .22 with Douglas shoots the Eley Match very well also

Caveat to my advice:  I don't shoot silhouette, haven't had the chance until lately, would like to more.  My wife as my spotter has difficulties, so limiting that.  However, I have shot BPCR rifles a lot, and have gone through a lot of .22 shooting in silhouette type conditions.  I shot many thousands of rounds for about 5 years using a variety of single shot .22's.

My first choice would be a .22 custom built to match my bpcr rifle.  Just for consistency.  Second choice is a liner in the bpcr rifle.  I built my own, for my rolling block .45-90 primary rifle.  Was pretty simple, just turned a steel case out to match my chamber and soldered in a liner to it.  Went to McMaster Carr and purchased teflon tubing that was a tight slip fit onto the liner, and a nice sliding fit into the .45 barrel.  Cut the tubing into irregular length chunks an inch or just over long.  pushed them on barrel.  Slide the liner into the barrel; I don't have extractor, just pry them out with small pocket screwdriver.  The key to my liner is that it is tunable by moving the tubing spacers.  I space them irregularly, and then move the last one and try it, until it shoots small groups.  I've shot many 5 shot groups with iron sights at 100 yards with it that averaged between .75 and 1.25 inches for 50 shots.  Best groups have been around 1/2 inch.   

My third choice (actually almost my first) would be to build a custom Ballard.  I've shot a double set pacific made into a .22 several thousand rounds and it's very accurate and dependable.  I built a couple of standard trigger ones last year, but havn't tried them out yet.

I have also built a couple of Stevens 44's, and they're okay.  Have two of the Miroku winchester low walls, they're barely okay, they're not as accurate as my other rifles, and you can't easily disassemble them to maintain them.   

H&A 922's are a bit light, but the best of the boys rifles.  Stevens favorites are too light.  Remington #4's are a bit light, but if rebuilt with bigger stocks and heavy barrels like Curt Hardcastle did are quite nice.  Remington #2's are nice if rebarreled a bit heavier.   

CPA's are good rifles, I just personally have never liked them.  If you go with multiple barrels and don't have other rifles to complete against them, they're a lot of rifle for the money.  If you have dedicated rifles in different calibers, they pale in comparison being a convertible compromise between all the calibers.

Shooting .22 BPCS is an extremely fun thing to do. Down side is a .22 RF barrel is probably the most fickle thing you will ever have to deal with. Second is .22 RF ammo. I have been  following this thread with a lot of interest. Testing ammo is very important to find out just what your barrel likes. One thing that is not mentioned is shooting on paper at 200 yds. Most good ammo will shoot surprisingly well at 100, but when you start to go beyond that, that is where things really change. I have shot some Eley at 100 that was superb, under an inch. but after that the wheels fell off. At 200 it was hard pressed to stay on a ram target.  What worked out to be very good in my rifle was SK Pistol match special. Best I can figure out what made it Special was that it was just a little bit faster than the pistol match, but it shot very well, down side is I haven to been able to find any more of late. Also don't discount less expensive ammo. I tried some Fiocchi at $6 a box and out to 100 it didn't shoot bad, would make good practice ammo. 
Sam