Heavy blaster rifle would probably get overlooked by most snipers as well since autofire's not that much of a boon when you're shooting from long or extreme range.
On the contrary, the Heavy Blaster Rifle is an excellent sniper weapon. If you can hit with Autofire at Medium range, then you can hit with Autofire at Long range with a telescopic optical sight on your HBR, since that shot has the same Difficulty of 3. The description of the HBR even mentions that it is excellent for sniping.
That and you're probably a Sharpshooter if you've got your sniper hat on, which means you've got Sniper Shot as a Talent if you feel some need to engage targets at extreme range. Between True Aim, Natural Marksman, a laser sight, spin barrel, and telescope, a Shaprshooter with a 4 Agility would be able to make hash out of a lot of opponents, Nemeses included, at range without too much trouble at all using autofire.
Edited by 2P51