The weight of the bullet doesn't matter and neither does the brand. It may come as somewhat of a disappointment to you to know that deer aren't the tough. What does matter for those long shots is accuracy so, pick the bullet that is the most accurate for you first of all. Secondly, pick the bullet that provides the best ballistics in the gun you're shooting. As long as the bullets is made of lead and/or copper it will kill deer just fine.