To me, a G&H conversion of a 1922 Springfield chambered for the R2 cartridge is a classic, something that cannot be replaced. Nor can it be readily reproduced.
The 1922 Springfield action was designed for the .22 Long Rifle cartridge. It does not have forward locking lugs. What would have been the safety lug on the regular 1903 bolt is the only locking lug and it is asymmetrical. The R2 is probably pushing that design about as far as a prudent person might want to go.
The barrel was originally a .22 rimfire, with a 16" twist. It probably has a bore tighter than those of modern .22 centerfires. The light & small diameter bullets for the Hornet can usually be found, but getting ammunition put together is a 100 % custom job, with attendant cost. The parent case is more or less available, depending on demand. The new production .25-20 Single Shot basic brass is produced to modern standards, but IIRC, the R2 requires a special set of case forming dies, annealing the basic case, and maybe fire-forming. Dies are available. All that is required is time, patience & $$.
Ken Waters wrote an article about the 22/3000, the R2 and the Maximum Lovell that can be found in his Pet Loads book.
