Joe,
I took that capacity from the site I referenced above. I'll check with a few people on here shooting it. I think the shoulder is blown out as well as forward. I'll check my reamer prints when I get home.
Terry
Not definitive, but looking at two reamer prints,
260 has a shoulder diameter of .455
260AI has a shoulder diameter of .459
6.5SLR has a shoulder diameter of 4545
Makes sense that it's slightly less capacity than the straight 260.
I'll reach out to a few who use the 6.5SLR to see what they're finding for h2o capacity and let you all know.
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