I believe what you have isn't a Ruger product, but rather, a Rohm Gmbh revolver, manufactured in Germany, and imported into the country by R.G. Industries. The RG-23 used the .22 Long Rifle cartridge.
No such model in the Ruger line.
Ruger has never made a model with that number. You might be referring to a RG, which was made in Germany. No sn records.
The ruger model RG23 CAL 22 LR is between $25 and $45. <><><> Above is correct. RG does not stand for Ruger. It is a German abbreviation for Rohm Inc. These were German handguns of very low value and indifferent quality. Please have examined by a gunsmith before attempting to fire.
no
Ruger is one.
.380 ACP
Depends. If you mean the Ruger Mini-14 or Ranch Rifle, yes, you can. It is chambered for .223 and 5.56x45 ammo. If you read the owner's manual (available on the Ruger website) it will tell you that on page 13. The Target Model is ONLY for .223. Of course, the 6.8mm and the Mini-30 use different ammo entirely.
I do not believe you have a Ruger, but an RG- Rohm Gemeinschaft. Two very different companies. The RG is generally a low value, low quality firearm that was made in Germany. Value is based on condition, but may be $25-$75.
It will be marked on the barrel. You can also call or visit ruger's website.
Golden Saber
Any .308 Winchester ammunition.
AR15, M16, M4, Ruger Mini 14