Buy what you can shoot and shoot what you buy!
At least, that was the Golden Rule son and I established for collecting and rankings on the "want list".
I can say that other than a fine Belgian 12g cap lock, everything that has followed us home has had at least one trip to the range just to say we have shot it.
"Shooter" is a more pragmatic term indeed.
As the collection invariably grows, many have been demoted to the back of the cabinet only to see daylight when we get an itch to take something not used in a long while.
The selections on the "favorites" or "shooter" list are the ones that always get packed for the regular range trip whether or not we get to them that day.
Not all milsurps are shooters but, don't consign it to wall hanging or dust collecting in the cabinet until it has been properly cleaned, tuned and tweaked up a bit to discover the full potential.
Even for the ones not on our "shooter" list, they have all be subjected to an extreme clean bore conditioning and MolyFusion treatment. All have been lapped and the crowns buffed out. Many got a little trigger polishing and work to smooth them out a bit.
Not surprisingly, some that were thought to be a bit rough to be "shooters" turned out to be extremely accurate with a little TLC. Can't say I have any in the collection unworthy of burning powder now and then. It's just a matter of which are our regular favorites and what we have ammo available for.
Even the M35, M44 and New England Westinghouse M91 get a workout now and then with quite satisfactory results.
Son has laid claim to the '70 M39 as his "shooter" having decided to return my '47 Springfield M1 although, when we have a stock of 8mm, the Hakim is always his second choice.
I often have difficulty choosing a "shooter" for the week and mostly concentrate on fine tuning my custom jobs and long range rifles.