Its nearer Hodgdon's older max load for lil gun that they reputedly trimmed as it was based on Rem brass and you simply can't fit the amount of powder in other headstamps. Its a hot load but no obvious signs of pressure including on a 20º + day in the summer, not something I would suggest others try (Don't try and replicate this, stick to Hodgdon's data). You can fit over a grain more powder in a rem case vs a winchester case, 2 gr + compared to PPU.
Mag is being modified over Christmas to take the longer COAL, 10 though off the lands with 40 gr SBKs for me is 1.94" so i need to get an extra .205" out of the mag, will involve reducing the plastic spacer at the rear and making an extended follower with a spring stop under.
Nosler varmageedon and SBK are both flat based bullets so with a fuller case you are less likely to get powder trapped bewteen the bullet and case neck compared to boat tail equivalents such as V-max or nosler ballistic tip.