Using a .300 Win Mag on ants is a bit much, but I have an original Browning M1000 with a 6-20X in .300 WM that I have considered using on ants on those slow muley days.
That sed - we must remember that the Berger projectile is generally a long-range-thinner-copper wall design which controls...
The magnum-mentality appears alive and well among us - despite the overwhelming law of physics that: "It's not what you shoot - but where you hit - that really matters."
Most are not dumping a HV projectile into ballistic gelatin afield - so there are an infinite number of physical variables...
When Rem introduced the 6.5mm Mag back during the 1960s the ammo was difficult to find and the brass is no different today.
I used the Rem brass from 4 or 5 boxes of 120 gr factory ammo I found back in the day and that was all I needed to recondition and workup loads for both the 120gr and 87gr...
One point not mentioned:
Fifty (50) years ago, the stainless steel (SST) barrel was a rarity.
But from a metallurgy perspective the SST and chrome molly barrels of today are vastly different - hence they require a different protocol of care, than the typical black barrels of the past.
Just...
In re: To Your Point -
S.G. & Y. Precision Rifles, LLC - Barrel Break-In & Cleaning Procedures
by Speedy Gonzalez
Many of our customers upon taking delivery of their new gun or barrel are in a quandary as how to go about breaking-in that new barrel for maximum life and accuracy. With so much...
You may just be over-thinking the matter of a digital-caliper-measured dimension as a preconceived & absolute determinant of accuracy from a given rifle.
During the 1960s, when "long range" was closer to 300 yards, we simply used a permanent magic marker combined with periodic (finished...
During themed-1960s - I bought one of the early Rem 600s chambered for their 6.5mm magnum round. I shot everything from groundhogs, to ants, to deer. And it was accurate with everything from the 87gr HP to the 120gr factory round.
A 26" barrel would have likely produced 25% more velocity, but...
True.
But just like "speed" - money can also buy accuracy at a distance. So it's not always the nut-behind-the-wheel; OR a trembling finger on the budget-based trigger.