Having chronographed thousands of rounds from many different cartridges, I nearly always come up well short in terms of velocity compared to what most manuals say. Years ago I had a Remington 700VLS 22/250 with a 26" bbl and when using Varget with a 50gn bullet I remember that Nosler manual saying I'd get xyz velocity, but my rifle produced velocity 200fps less despite having a barrel two inches longer. Go figure !
