260 Rem case capacity?

[LR_Shooter]

Since Lapua start making cases for 260 Rem, had anyone measured their case capacities and what are they verses R-P brass or brass made from 308 Lapua?

Another question about capacity, is there difference in capacity when using Lapua 243 vs 308 brass?

 

[Laurie]

My .260 cases in a minimum SAAMI chamber measure:

Rem - 56.6gn
Lapua - 55.1gn
Federal - 54.4gn

I can't tell you off the top what reformed Lapua .243 measures although I have some somewhere, but my .308 Win Lapua brass also in a minimum SAAMI chamber weighs out at:

standard large primer - 56.6gn
Palma small primer - 56.4gn.

All cases are recent manufacture.

Given the shoulder / neck length and neck diameter increase for the .308 Win case I would reckon that reformed Lapua will be similar to the original calibre stuff.

 

[LR_Shooter]

thank you Laurie, I was planning to load 47 gr of H4831 with 142gr SMK with brass formed from 308 Lapua cases , but I stopped short because powder was at the neck-shoulder junction, but Hodgdon website list 48 gr as compressed load, but to me it seems that 47gr will be compressed as well, 142gr SMK seats right at the shoulder-body junction. So far I load tested 43gr of H4831SC and POI is the same as 40.7gr H4350