Hard to argue that line of reasoning in most cases.
Let's say that we all consider the 300WM the next standardized cartridge in the next level up in 'potency' over the 300WSM. In play then becomes one's desire to then reconsider a chamber in long action, the belt inherit in the design and, albeit minimal, the additional weight in similarly designed rifles.
There are among us a large and growing % of hunters/shooters that personally desire to put together the lightest rifle possible. Few companies offer heavier models in hopes of gaining a larger market share of firearms, be it in long guns or handguns. Their reasons for 'going light' are their own as it should be. The 'belt, no belt' argument comes down also to a personal choice and is of no consequence to anyone but the owner.
So you're right in most instances except that the very distinct and unique designs of the both of these two particular cartridges not only help most of us to make that decision somewhat easily as there's not much middle ground between the two in regards to personal taste and opinion, we also need to consider just as importantly the rifle for which our choice will eventually be chambered. Do you prefer a longer action over a shorter action and do you want a belted .30 over a non-belted one...? Again...the weight difference is minimal in like offerings, but a few ounces can be a deal breaker for those who are trying to put together the lightest rifle or rifle/scope combination possible.
Those are just a few of the possible reasons that came to mind for reconsidering a 'move up'.
Last edited by magnumb; 08/19/16.
