I have an interesting situation with my 22-243 win. I was hoping to shoot the 90gr VLD out of my gun. The gun has a 1:7 twist. Which is what Berger recommends. I was shooting the 90gr VLD with a charge of 44 grn retumbo. I managed to chronograph them before they started tumbling and was getting around 3175 fps. The bullets that I was shooting were a pretty old batch of 90gr VLD's. Lot # 000827 to be exact. Are these bullets different in some way from the newer ones? I have a unopened box of new 90 grn VLD's Lot # 3166. Wondering if it would be worth it to try them too? Does anyone have a suggestion on why they would be tumbling out of the gun? The gun shoots 80 Amaxs really well 5 shot group in the .5's with a velocity of 3350 fps. Thanks in advance.