Best I've been able to get is 3moa.
I've talked to the guys at 68Forums and they indicate a different powder (I've been using H322) and if I load them out to 2.29 instead of 2.26 they will do better.
Problem is I don't want to stock another powder just for 'plinking' ammo when H322 works great for my 110gr VMAXes and 90gr TNTs, nor do I wish to make my 'plinking' loads require the use of the more expensive PRI Magazines. I'll keep the PRIs for VMAX and 130gr use, the C-Products are for everything else.
The alternative plinking bullet is the 90gr TNT. It's more accurate, available in bulk, and not much more than the FMJ. I wish I had learned that out prior to purchasing a few thousand of the FMJs.
ETA: My load is 28.0gr H322 with large primer brass (usually CCI large rifle primers). This load I found duplicated exactly the Remmington FMJ factory load (just a hair over 2400fps from a 16" barrel with a SAMMI chamber). Using small primered brass would help with the variation and allow for higher pressure (more MV) but I reserve the 'good' brass for my 'good' loads.