steve,
Read their explanation (pitch) at this link:
www.bandpusa.com/b-p-our-story I'm not quite ready to endorse this as being gospel, the shock absorber thingy I mean, but there is no questioning they are some very mild recoiling loads, just as Federal paper loads are.
This is built into the head of the hull they produce, as I understand it, so reloading them might well very nearly reproduce the effect. However, I'm inclined to believe some of the felt reduction is due to the burning characteristics of the powder they use.
SRH
