I copied the following from Wilson Combat's site in regard to their accuracy guarantee; at he bottom it lists the handloads with N-320. I'm not saying these are what VV would recommend but it's what Wilson says at
http://www.wilsoncombat.com/faq_handgun.htm
Do you have an accuracy guarantee?
Yes, Wilson Combat rifles and pistols have accuracy guarantees. Depending on the model of pistol the guarantee is 1 inch or 1.5 inches at 25 yards. Rifles feature a 1 MOA guarantee at 100 yards or 1.5 MOA guarantee at 100 yards, depending on the model. You can see which firearm models feature what guarantee by viewing the product web pages.
Please Note: The accuracy guarantee is valid only with the ammunition and stipulations listed below:
Handguns:
1 inch or 1.5 inch accuracy guarantees are based on the pistol's ability to place 5 consecutive shots (center to center) into the guaranteed group size from a distance of 25 yards when fired from a Ransom machine rest by at least one of the following ammunition types:
Federal Classic 45D 230 gr. JHP
Federal Hydra-Shok 230 gr. JHP
Hornady 200gr. XTP
Black Hills 230 gr. XTP
Winchester SXT 230 gr. JHP
Handloads:
6.4 gr. VihtaVuori N320, Nosler 185gr JHP
6.3 gr. VihtaVuori N320, Hornady 200 gr. XTP