There is a reason for 1 round at a time in the chamber. Serious shooters will after shooting a round, will lay their rifle down with the bolt or the action open, weapon cleared, and look through their spotting scope to see how the last round fired printed. Loading a new round and getting repositioned and locked into your rifle again uses up time. This time will also allow your barrel to cool thereby allowing a serious shooter a better group. Heating up your barrel is never ever a good idea, It ruins the throat of your rifle. Those that want to load more than 1 round at a time and shoot until the magazine is empty can be a real safety hazard when cease fire is called or with many different individuals on the firing line with many different levels of experience in handling firearms. This is because we are all human, and we all occasionally forget when distracted. U can forget how many rounds you have loaded, expended, and have left in your weapon when cease fire is called by the RO. This can be deadly to the shooter and others around him. Case in point. A bolt action Remington 700 bolt action can discharge by itself (Remington Moment) because of a malfunctioning trigger design. I would hate to be down range changing targets and get shot in the back because someone left a round up the spout and the rifle got slightly bumped by someone walking by the shooting mat or table and a Remington Moment happened.
Thx for the laugh, but not everyone at a range aspires to being a "serious shooter" at all and even those that do may not agree with your definition and what is required. And while I appreciate your concern for me heating up my barrel at the end of the day it is MY concern. As for your safety concerns there are ways to ensure safety without the 1 round rule. In short, please don't tell me your way is the only way I can enjoy my sport.