http://scaledinnovation.com/gg/snpTracker.html?snp=R-FTE60829
R-FTE60829 may be under review at SNP Tracker as it was flaged with "*". This is the new BigY SNP discovered by testing of two Howell males. However, they still have an average unmatched PV count of 5. SNP Tracker is reporting a much earlier position for the new SNP at 1170 CE.

Hopefully this 400 Year difference in dates will be resolved soon. Averages and mean values are difficult to estimated with only two results.

FTDNA is reporting 95% CI at 1572 CE: https://discover.familytreedna.com/groups/howell/tree?subgroups=17931