7.5.55 Swiss - Difference in Sizing Dies

[eric_2902]

What gives? I happen to have 2 sets of dies for the 7.5x55 Swiss (got both an RCBS and Redding set for Christmas from different people). I noticed a little difference in the shoulder so I measured. Some folks say the Redding is set proper for K31 but others say BS. If that logic is true then does that mea the RCBS is set for say the K11? I'm a little confused.

Thoughts:

Measurements:

-------Case Len-Top Shoulder--Btm Shoulder--Neck--Top Body--Bottom Body
RCBS--2.184----1.866-----------1.757----------0.333--0.458------0.496
Redd---2.183----1.864-----------1.766----------0.332--0.459 -----0.496


Note. Comparison used brand new nny brass.

Somebody set me straight here please.

Thanks

[*Paladin*]

Yeah, the Redding set is supposed to be specifically for the K31 chamber. It doesn't matter tho. I use the RCBS set for my K31. No issues whatsoever. The difference between the two 7.5x55 chambers is very small.