Hodgdon's website give an OAL for my .308 in 155gr SIE HPBT (anyone know what SIE is?) as 2.775. But different bullets are different lengths. The Lapua Scenar's in 155 gr must be made of lighter metal (less lead, no lead?) I don't know but they are PREMIUM bullets, The 155 gr Lapuas are actually LONGER than the 168 gr Sierras by quite a bit (.065" to be exact). The same design Sierra's in 155 would be even more difference! Then I read that deeper seating depths lead to higher pressures. It seems to me that they should specify a maximum bullet seating depth and then we can go from there. Specifying OAL (I assume it is a MINIMUM OAL, you can load longer, making for LESS seating depth? making it ok pressure wise) is ambiguous because different bullets are different lengths!! Yet everyone uses OAL. I mean what the heck?