Im not sure why it was even mentioned unless someone is trying to stir the pot.

As far as the Triple7 primer go my Lehigh plugs worked well with them but i never tried them in the cold. My sabots also fit super tight (nearly too tight) but i was using 300gr bullets and larger.

Some brands warn against using bullets over 300gr in sabots so check your manual or risk voiding your warranty. There was no such warning in my Knight or GMB manuals and BH209 does very well with the heavier bullets. I use a standard Win209 almost all the time in my Knights and have no problems at all with ignition or accuracy regardless of bullet weight. First shot out of a clean bore is slightly off from the rest but well within standards for the distance i shoot.