Contender,
I owned a 760 and it was accurate and dependable. It had thin, multiple bolt locking lugs, whereas the 7600 has 4 larger lugs. I believe the lower number of lugs and their increased size are of significance in the 7400 autoloader in improving dependability over the 740 and 742 models. However, as far as I can tell, it mattered not a whit in the pump. I believe it did not hurt the pump either, and obviously, Remington wants parts commonality for ease of manufacture.