Hi guys, I've got one for you. I have a 1/3 to 1/2 MOA load in my 300 ultra using 210VLD's. I use Nosler Custom brass, H-1000 and Fed 215 Gold Medal Magnum primers. I regularly shoot at a life sized plywood bull elk anywhere from 700-970 meters here on the farm where I live. It has been great practice on shot placement and wind reading skills. I shoot just one shot and normally hit the vital area at all of these distances. Occasionally I may dial a tad too much or not enough wind, but they have all been "kill shots." The elevation is normally spot on. A few weeks ago a fired one shot at 730 meters and did not hit the elk, this was with no wind and great conditions. I couldn't explain why this happened so I kind of discounted it as a primer issue. I fired a pair a couple of days ago at 700 meters that were 2 and 3/4 inches apart dead center in my bullseye, good enough, no problems. Tonight I fired a shot at the elk placed at 968 meters and saw my shot impact low in the grass behind the vitals. By my calculations the bullet was roughly 2moa low of where it should have impacted. Atmospheric conditions have been the same lately, calculations in the scope were done correctly before the shot and the correct hold in the reticle was used. I looked my case over good and discovered that it has a very faint extractor mark and almost no crater in the primer which normally I have a pretty nice ext mark and the primer is cratered. The load is safe, never had any sticky bolt and it is highly accurate. I decided to pull a couple bullets to make sure nothing weird happened with the powder charge and found that the charge was perfect just as I expected. My only conclusion at this point is that I have come across a couple of weak primers lately, will this cause a velocity drop this significant?