I absolutely love my carbine, it’s fun to shoot and won’t beat you up while doing so.
This website has really good info on carbines.
http://www.bavarianm1carbines.com/rifles.html
For reloading on the cheap lead bullets for the carbine work really well.
With the standard velocity of just under 2,000 fps there are usually no problems with leading in the bore.
Penn bullets have some of the best pricing I have seen.
https://www.pennbullets.com/30/30-caliber.html
As far as accuracy goes at 100 yards my carbine is not that far off from my Garands, but stretch out the distances a bit and the Garands leave the little carbine in the dust.
If your Grandpa’s carbine accuracy is really off, a re-crowning of the barrel might help.
If the barrel proves to be toast the CMP sells and installs new Criterion barrels. (Other places do as well.)
But I really like shoot the Garand better, right now I can reload a 168 match type load for about .45 cents.
This of course does not include all the equipment that I needed to start, it does take a little while to recoup all the start up costs.
I know you said the CMP is not an option, but just in case you change your mind here is something I wrote for another guy on how to go about getting a rifle from the CMP.
This fist link is all the requirements
http://www.thecmp.org/Sales/eligibility.htm
The four main things you need to prove:
Citizenship
(I scanned a copy of my birth certificate, the emailed it to the customer service people.)
Age Your birth cert. will take care of this.
Member of a CMP organization.
You may belong to a group right now and not even know it.
This link will let you search for a group that you maybe in or one you could join.
https://ct.thecmp.org/app/v1/index.php?do=clubSearch
I did not have a local group so I joined the Garand Collectors Association. ($25 a year)
Here is their link.
http://www.thegca.org/store/
They will send you membership #; you will then need to email/call this in to the customer service people.
While you are waiting on the G.C.A. set up an estore account on the CMP web site.
https://estore.thecmp.org/store/login/login.aspx
You can order other stuff while you are waiting (but no ammo)
The customer service people will get back to you when they change your account setting.
Until they change it if you try to buy ammo on your estore account it will say something like "club membership not valid"
Proof of marksmanship training.
Towards the bottom is the list.
http://www.odcmp.com/Sales/eligibility.htm
I did not have any official training that counted so I printed off this form.
http://www.odcmp.com/competitions/forms/marksmanship.pdf
Then I brought it to my local club, the range officer went through it with me and he signed it.
So far I have gotten three M1's; a sweet Springfield, a really nice H&R, and just recently an IHC. (just need the Winney
)