Thread: Lapua 308 brass resizing to 260

Originally Posted by Cigar

I thought it was the other way round, i.e. lengths were different to prevent chambering larger calibres in small chambers. I much rather fire a 243 round in a 308 rifle than vice-versa!

For some cartridges this is true but not the .308 family. There is enough difference to prevent , say a .260 chambering in a .243. The trouble spot is between .270 and 7mm where the difference is only 0.007'. For this reason the .280 and the 7mmWSM have their shoulders moved forward to prevent chambering. A .270 or a .250 for that matter on the .308 case is unlikely for that reason. Firing a .243 in a .260 only results in embarresmemt and endless leg pulling by all that find out about it.
Regards Grandpamac.