Is your accuracy lacking ? you could define that for the other readers, to get best inputs..
a trigger job is always a good idea.
have you tried other rounds, or powders, bullet weights ? bullets shapes, etc can make a big difference.
you could do a search to check into slugging the cylinders and barrel and getting recommendations of the best size of cast bullets for your measurements you find.. and then you will also be able to get reccomendations for cutting the forcing cone, maybe work on the barrel like firelapping removing right spots, etc. , reaming the cylinders; some of this you can do and some you can have done at your direction..
or you could do it the easy way and send those rascals to a smith that understands how to work on rugers .. cause what the one you talked to was really saying was : I do not have any idea...
you can have the gun looked at by a real smith, and decide what you would pay for from what he suggests... they are surprisingly easy to work with and will evaluate and make reccomendations while you learn more from others who are knowlegeable here about what they have done and would do... again , you will hear about having a trigger job and tightening / removing endplay; reducing the cylinder gap; making the barrel and cylinder sizes match and work together... what is needed may be cheaper than you think and affordable... even if extensive work is needed.
I understand that on a gun that does not shoot well it will make all the difference... on a gun that shoots well already it will likely make a positive noticeable difference worth doing and paying for regardless.
in the instance that the guns measurements of bore and cylinder are so incongruent as to require extensive replacement of expensive parts and ht egun is not worth a lot to replace... well .. some guns will better be replaced as they are older and out of pocket outlay may be more than it would cost to start over. Keep the questions coming to the guys here that have great experience... this is from what I am learning about ... but you need to get opinions on what others suggest you could do yourself, if you decide that going to a real good smith is not what you want to do right off.
that is what I would look into .. I just know the questions at this stage of my learning... not the answers.
dk