Last evening I went to the Vihtavouri web site looking for load data for the 6.5 Swede. They have two variations listed, one for the 6.5X55 Swedish Mauser and the other for 6.5X55 SKAN. The former had a disclaimer that this load data was for 94 and 96 rifles. The latter had it's disclaimer saying that this data was only to used in modern firearms, and gave a list of them. Aside from higher pressure loadings for modern arms, are there any physical differences in the cartridges cases?