I was just reminiscing about the 70's and the people and events then,,,notice at the top of the target is Jess Corders signature ,,,,he loaned me a rifle to get started in Benchrest ,,,,he was on the measurement committee at that time and said that when he got the target it had been handled a lot and had absorbed a lot of moisture here in the east (West Virginia) and when he did the measurement the individual holes in the sighter measured .009" just like the 5 shot group did,,,the moisture in the west where it was shot was low ,prolly 30% or less,,,and the moisture here was 90% or more and made the paper (and the hole) swell ,,,,so it was probably a true zero group,,,,,Roger