I don't know but there are no signs of excess pressure what so ever No extractor marks no difficult bolt opening and I am still using the original 50 brass I started with about ten years ago. I have only loaded that one load in the NEF the one with the 26 inch barrel and that was 2950 with the 120 grain Sierra. I have an Idea with the 26 inch barrel it would develop good velloocity. I do not however load either to the max and backed off to about 2900 on the Remington BDL. I like the lighter bullets and they do not need to be driven beyond 2800 fps. The load for the NEF just happen to be extremely accurate so I left it alone. I have some 140 grain Ballistic tips loaded for the NEF but have not had any decent weather to go out and give them a try.