My 2 cents worth: I have one of the Miroku 1885/78 models with the light tapered barrel in 45-70. I did the McGee tigger fix and it shoots very well. (HOWEVER it has one of the pre-production Badger barrels that were installed in a few dozen tangless actions in the runup to the BPCR and Creedmoor editions. I cna't speak about the Miroku-Browning slower twist barrels) I have broken 240 in the Schoyen with it a couple of times at EG with the factory stock breechseating the Lyman 457676 with 5744----so the gun is capable it the load is right and the shooter does his part.
I bought the 22 that MI-shooter aludes to from him. It shot well for him and equally well for me. Steve Durren had worked it over and done a Dale53 triggern job on it. Its loss due to theft was a real heartbreaker for me
. It liked Wolf TM real well and I could get occasional 240-242 in the 200 yard rimfire Schoyen at EG. Again it did not have a bench rest stock and was real sensitive to shooting technique (and EG's wind conditions) but the gun was in and of itself accurate --like most 22 rf ---with the right ammo.
I have talked with and read about other shooters who had accuracy issues with the Browning/Miroku/USRA/Winchester lowall 22s. While any factory rifle can have QC problems especially in bore and chamber conditions I suspect that they will shoot well once the right combination of ammo and technique is found. They are not built or sold as match rifles, but with the right ammo, decent trigger job, a wider forend and good bench technique they will probably shoot as good as anything else on the line. In point of fact many Win 85 .22rf shooters insist that there is a desogn weakness in the original extractor firingpin relationship that creates irregular ignition. The modern Browning redesign does away with this problem, so given equal barrels/ammo/triggers etc etc the new browning
MIGHT be
MORE acurate--my speculation
The Browning/Miroku/USRA/Winchester iterations of the '85 is very modified from the original. The trigger especailly is modified and a real problem area. 3 or 4 years back the Journal had an article about the Browning trigger system and it's development. Dale's trigger fix will give a simple clean safe pull but it will not be like a set of set triggers.
THese rifles are not good do it yourself projects for the average gun tinkerer, however if you are careful and follow the instructions that have been posted in the gunsmith section and elsewhere it can be done. However as Dale pointed out they do very well with nothing but an occasional flushing so total disasembly is not a big requirement. I have been shooting the 45-70 for 5 or 6 years now with both BP and smokeless and have not had to tear it apart. Usually I have a near compulsive need to disassemble any gun I get to see what makes it tick and to deburr polish and hone any irregularity I can feel. I resisted the urge with both Brownings.
A final word of caution though. Stock removal before flushing is reccommended unless you want to do a complete refinish since the solvents and rinses can damage the stock finish. In addition the chemicals in some of the more effective flush/rinse mixes can be corrosive and dangerous unless handled properly and in the right sequences.
IN spite of their quirks I really like the rifles --- in fact I'd probably give up my left and best one to get one of the Lowalls in the .260 Remington chambering