Telephone Browning, and they will send you the correct manual.
It's not a good idea, IMHO, to rely on information available on websites, as it's often inaccurate, mis-placed, or out-of-date.
Manufacturer websites, particularly, glorify their latest/greatest, because that's what they have a vested interest in selling [n]now[/b], and can be mis-leading for the unwary about older goods.
I've owned some kind of BAR, ever since about two years after they were introduced.
You are correct, the bolt must be either closed or held back to swing down the floorplate/mag, since the magazine follower is also the bolt hold-open device.
Once it's down, the mag can either be reloaded in place, or replaced with another, loaded mag - since they readily snap in/out, on/off the inside of the floorplate.
The chamber can be manually loaded - but under no circumstances should the bolt be slowly closed/lowered in place.
The bolt should be allowed to snap fully forward ubder it's own spring pressure, from it's rearward position.
The first cartridge can also be fed from the mag, the bolt closed as above, then the floorplate opened to top off the mag for a full capacity.
I've never had a BAR jam, as long as it was firmly shouldered, and not allowed to "float".
That includes a Made-in-Belgium model, two made-in-Belgium/Assembled-in-Portugal models, and another I can't recall the pedigree on. I bought one new, and the remainder "used".
I've also owned a new Remington 7400 Satin, for a few years, without problems.
BTW - I used to be the RangeMaster at my gun club, and as such, I ran "Public Sighting-in Days" every year for fifteen years.
During that time, almost w/o exception, the shooters that had to rezero their rifles, because the rifle didn't hold zero, were shooting Remington 740/742/74/7400 series rifles.
No-one, shooting a BAR (there were about 10% as many as Remington shooters) had problem one, with a wandering zero or jam.
