Got ya, I've been buying/planting 4's in KS & MO for the last 5 years or so and haven't been frosted out yet, so I was curious if you had run into troubles before.
Seems like when I drill on 7.5" centers, I dont have near the early browse pressure, but its difficult to overseed, & they shattered in January, vrs holding into February when I opened it up to 15" centers