I have used the Hornady bullets before. While perfectly functional, they vary drastically from bullet to bullet. You are seeing this in your reloading. I have seen them vary by up to .030" bullet to bullet. Thats actually a little more than you are reporting, and makes it very challenging to seat to the canellure consistently. Measuring the OAL length dimension from the case head to the tip of the bullet is really a poor way to measure though. I only measure this way to confirm magazine length fitment. Even Sierra Matchking's will vary by a few thousands or more in overall bullet length. The consistent dimension you really need to be measuring off of is the ogive. For the most accuracy, measuring from the case head to the ogive will give you repeatable results in your setup. It may not matter to you just yet while you are new, but when you begin wanting to squeeze the most accuracy out of your loaded rounds, this is the preferred method.
http://www.midwayusa.com/product/23...ad-bullet-comparator-basic-set-with-6-inserts
This^^^
But I've never had .030" variance unless something was up.
Actually you will find that measuring tip of bullet and getting the variance you mention will drop drastically if you check those same exact loaded rounds with the comparator that you are talking about. This is caused by the calipers not measuring the same thing your die engages when seating a bullet. The rifle die isn't pushing on the very tip but that's what you are measuring. The comparator pretty much does engage the ogive just like your dies.