The and only problem with using Bullseye. Its very easy to double charge a case with it since you use such small amounts of it. Try to pay close attention to what your doing when charging up your brass (if you do so by hand)
Store bought bullets (lead) don't require any lubing before or during their seating.
For OAL ask the bullet manufacture or it distributor for their advice. Best time to do that is when your placing an order to purchase.