1903-A3 Bolt question

[Doco overboard]

What type of replacement bolts for an 03-o3A3 are generally recognized as having a + tolerance for fit?
HO, R marked doesn't matter I just want to tighten up a barrel receiver combo for a hunting rifle project. I have a spare square lugged bolt(s) that will work but do not like the aft end of them for how they react with the bolt sleeve assembly.
Any suggestions on what to look for would be appreciated so I can source something if its available out there.

Thanks-Brian

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[Chuckindenver]

R4 R6 bolts are a little longer at the bolt head. some CC bolts are also longer. but they are hit and miss.