.007 isn't a lot of difference but usually I only see about .002 variance between rounds while loading. These variances are due to the bullets profile from bullet to bullet and is normal. Now if you were to measure from the ogive of the bullet it would be more consistent.
As you probably know when the oal is shortened the pressure goes up so be careful but I can't recommend if .007 shorter is safe, that's up to you to determine. If your at the top end of the load recommendation I probably wouldn't shoot it. If your in the middle then I wouldn't worry too much about it.