Thanks Rob for responding.
I totally agree with you and this was my argument with a technician from Remington.
Sadly to say, I couldn't get an answer from first Rem Rep on line and that was an ammo/and related components dept.
I was explaining that I am loading a pretty stable powder and keep my PF at around 175, which is AIM ~185gr bullet and 950fps velocity.
Technician who I was transferred to, told me..."cap is thin in these primers and therefore we not recommend for .40SW, but it is good for 9x17"... I told him, how thin is a cap, is as thin as Federal, which I use the most. He said, can't tell you that, we are not familiar with Federal primers cap thickness.
Another problem with Remington primer is, they seat high, sort of like CCI.
PS
Have I mention, Epps has them and they sell 2K per person for $36 plus tax.