Interesting. Can you show shooting results at 100y with your stainless 10/22 manlicher and other fixed barrel 10/22's you own, all influencing factors being equal? In general, there are number of factors that can affect accuracy like a quality of a gun, shooter's skills, weather etc. etc. Even shooting with a hard and soft rest can change the results with same gun. I read that for a 10/22 supposedly a different torque on a stock disassembly screw can have some influence on accuracy.
I really like rimfire rifle shooting, and in particular with the 10/22 system. I have been interested since I bought a cheap basic synthetic stocked version for a project about 10 years ago and was surprised at the difference a good barrel and some compatible ammo could make to accuracy and consistency.
When I buy a rifle, new or previously used, it gets stripped, cleaned, reassembled and lubed. I use a FatBoy torque wrench for the barrel / receiver / stock connections. It then gets 250-300 rounds down range as a break in exercise and check scope operation etc. Then it gets re-tighten again if necessary.
I shoot on a concrete bench, off a Hyskore rifle rest at 50m. 5 shots in @60 seconds, 50 rounds per type of ammo. (I use 5-9 different types of ammo, normally middle or lowish / high end target rounds such as Eley Sport / RWS Target / CCI Green Tag / Aguila Rifle Match.) There is a chronograph (CER) in place and I use a couple of different softwares to interrogate the results.
In short, with a heavy profile, fixed barrel 10/22 rifle I expect to get under 1.5 MOA across the board with several sub MOA results. With my two takedowns, same approach I get 1.5-1.25 MOA at best with most being 1.75-1.90 MOA. (I believe the scope needs to be barrel mounted to get better results. Mine are not.) And the international is @1.75 best result ever, normally 2-2.25 MOA.
Now I do admit that the International is bone stock, where all the fixed barrels and take-downs have been partially / extensively modified.
I have a library of about 900 target results ranging over 9 years for my 10/22 in the quest for the 'perfect set up'. To date, my best two are the original rifle with a Hogue stock and Dlask 16" barrel and a built from scratch Dlask TUF 22 + 16.1" Grey Birch Carbon Fibre barrel in a Hogue stock. These normally do sub MOA.
Candocad.