It was a typo, supposed to be 2835 fps for 28.6 gr.
That makes sense. Is yours a 24" barrel?
Like I mentioned above, I decided to do some testing with Varget in my 243 LBC today. I'm pretty impressed at the velocities, and the burn rate vs density seems just about perfect for this cartridge - I was able to work up some pretty hot loads, and could have gone a bit over, but got good velocity with just a mild bit of compression when seating bullets.
This was not accuracy testing, just finding max pressure and velocity.
243 LBC
Hornady 105gr BTHP
Lapua brass
CCI 450 primers
Varget
I started at 27.5gr, this did 2600 fps.
Then worked up gradually to 29.5gr @ 2785 fps with some mild case head expansion. I'm hoping to find an accuracy node somewhere between 29.0-29.5gr.
I did try one at 29.8gr @ 2795 fps, but I think that was a little hot. (just more case head expansion, no ejector marks.)
Powder level on the heaviest charge in Lapua brass was right at the bottom of the case neck or a little below. Still plenty of room for more powder, but I'm not interested in making Grendel belted magnum cases.
I also tried some fireformed Winchester 7.62x39 brass at 29.0gr - that did 2845 fps for two rounds and loosened primer pockets on both. Way too hot, do not use that load. Powder level was near the bottom of the case neck, and could have easily fit more in for a very dangerous overload. (This Win brass apparently has less capacity than Lapua, but is similar to FC Grendel brass.)
Based on what I saw today, the advice given above about just using a case full of Varget is flat out dangerous. Very bad advice, do not follow. Varget appears to be a good choice for the 243 LBC, but don't try a case full of it with heavy bullets. Maybe that advice would be true with light varmint bullets, I don't know.