I have posted similar questions. I have a Remmy 700 KS 7mm rem mag. Everything I shoot through this gun seems very slow. I loaded up some 168gr Berger VLD hunting bullets with 65.3 grains of IMR7828ssc which is supposed to be around 3000fps. My gun with a 24" barrel is pushing them at 2730fps. I have tried some Federal Ble box 175gr and they were only going 2650fps and some handloads 140gr accubonds that the book said 3250 and I only got 3029fps. Now this gun is EXTREMELY accurate, but very slow. What are some things I could check for or do to possibly gain some velocity? At this point it is not worth lugging around a magnum or using all that powder when I can get better performance out of a 270, 280, or 280AI. I already own a 270 that shoots 140gr bullet at almost 3100fps.
