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"With their multiple bolt lugs and rapid locking/unlocking, AR15s are more sensitive to pressure and bolt thrust issues than stout, modern custom bolt actions. There is also a risk of slam-fires in AR15s. Therefore, some high-end loads that may work in a BAT, Barnard, Borden or Stiller bolt action will be too hot for an AR15."
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though it is mentioning specific rifles, this statement is just a restatement of the differences between manual and semiautomatic operation that has been known to many shooters, reloaders and gun makers since the introduction of semiautomatic firearms. IT's NOT a new thing.
OF COURSE the semi auto is going to be "more sensitive" to pressure than a bolt action (or any other manually operated firearm) because unlike manually operated firearms, the semi auto is using the pressure of the firing cartridge to DO MORE than just push the bullet out of the barrel.
Whether it is by direct gas pressure on parts to make them move or using the recoil energy generated by gas pressure, the semi auto works by having parts moved by the energy of the fired cartridge and, those parts have to move at the right speed, AND at the right time in order for the semi to work.
The Semi auto is a balancing act of pressure, mechanical force and TIME. Things are balanced so that each factor is enough, but not too much, and doesn't happen too soon, or too late. In order to do that, the mechanism is designed to operate within a certain range of both total pressure and pressure at a specific point in time. If you go too far over or under what the gun is built for, it doesn't work right, and sometimes can be damaged.
(bent op rod on an M1 Garand is a famous example)
Semis are "engines" built to run on a certain "grade" of fuel. Too high or to low an "octane" and the engine runs like crap (if it runs at all), or runs too hard and breaks
Bolt actions are more like a fireplace, anything that burns can work.
From the bullet that crawls out of the barrel and walks to the target up to the too hot load where you have to hammer the bolt handle to get the action open, the bolt gun handles them all the same.
Semis are simply not built to be able to do that. Though there are a few that can, because they allow the gas system to be shut off.
It is entirely correct to point out that a semi auto is more limited than a bolt gun when it comes to top end max loads.
In the example here, with the statement quoted, I am unsure if, in this specific case, the difference in max load is due to the difference between a bolt gun and semi autos in general, or a bolt gun and the AR design semi auto, or if its just due to the limitations of the specific individual rifles used in testing.
Quote:
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some high-end loads that may work in a BAT, Barnard, Borden or Stiller bolt action will be too hot for an AR15.
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I am not personally familiar with the bolt actions named here, which makes me curious why THOSE guns were named, and if those loads that will be too hot for an AR15 but ok for a BAT, Barnard, Borden or Stiller bolt action would be ok or too hot for a Mauser, Remington, Ruger or Winchester bolt action.
I find that a bit curious...