I find the distinction meaningless.
To clear up any confusion.
The term "battle rifle" as I have come to use it refers to a long arm, a rifle, that fires a full power cartridge (as opposed to an intermediate cartridge like .223) and is suitable for battlefield use.
Generally, this term was used on TFL to distinguish weapons like the M14, Garand, and FAL from the AR-15, AKM, and others. It is most often used in reference to self-loading weapons of modern design, but is not necessarily so. A 1903 or Enfield is a battle rifle as surely as any that came after them.
An AR-15 or SAR is a semiautomatic clone of an assault rifle. By "assault rifle", I mean it the way the military describes it, that is to say, a select-fire rifle firing an intermediate cartridge. The AKM, M16, Steyr AUG, HK G36, and IMI Tavor are all examples of these weapons. Note that the AR-15 (and postban clones), SARs, etc, are NOT, in fact, assault rifles, as they are semiautomatic only, and by definition an assault rifle is select fire.
However, that said, not everyone distingues between full power and intermediate power cartridges, and hence many include clones and copies of such military weapons as the M16 and AKM in their list of "battle rifles". After all, intermediate cartridges have been used in many battles.
The term battle rifle can also be used in reference to practical use and barrel length. A 10" Colt Commando or an 8" HK51 could hardly be described as a main battle rifle, even though the latter fires a full power cartridge.
But you see, I wanted to see a specific breed of rifle. Simply asking for pictures of rifles would've been a little vague. To my knowledge, Sarah Brady has never used the term "battle rifle", and I certainly didn't make it up.
But let's not argue semantics, we're all on the same team here.