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Since the Steyr AUG has a stock that is inline with the muzzle like AR pattern rifles you will need extra high rings or a cantilever mount like this item from Vortex: https://www.opticsplanet.com/vortex-cantilever-ring-mount-for-1-inch-tube.html.
The Leupold VX-Freedom Scout 1.5-4x28mm Rifle Scope has an eye relief of 6.9" at low magnification and 6" at high magnification. As long as the mount you are using can provide the proper eye relief the Leupold VX-Freedom Scout 1.5-4x28mm Rifle Scope will work.
Yes, the Leupold VX-Freedom Scout 1.5-4x28mm Rifle Scope could be used on a rifle chambered in 30-40 Krag.
The Leupold VX-Freedom Scout 1.5-4x28mm Rifle Scope can be used with a Browning BAR MKIII. The 1" medium height Leupold PRW2 Rifle Scope Rings at the link below will work.
https://www.opticsplanet.com/leupold-prw2-riflescope-rings.html?_iv_tube-diameter=1-in&_iv_ring-height=medium
To mount the Leupold VX-Freedom Scout 1.5-4x28mm Rifle Scope on an M1A Scout Squad I recommend using the Leupold Mark 4 Mounting Rings. The 1" diameter medium height rings at the link below should work well for this scope.
https://www.opticsplanet.com/leupold-mark-4-rings-1-super-hight-medium-matte-black.html?_iv_tube-diameter=1-in&_iv_code=LU-RR-RING-MK4-60595&_iv_ring-height=medium
Yes, the Leupold VX-Freedom Scout 1.5-4x28mm Rifle Scope would work for a .308 at those distances. In order to mount the Leupold VX-Freedom Scout 1.5-4x28mm Rifle Scope to a Winchester Model 70 the scope base listed at the first link below will work. At the second link is a set of 1" diameter low rings that will mount to the scope base and work well with that set up.
https://www.opticsplanet.com/leupold-backcountry-cross-slot-win-xpr-sa-1-pc-20-moa-matte.html?_iv_parent-gun-make=winchester&_iv_parent-gun-model=winchester-model-70&_iv_gun-model=winchester-model-70&_iv_action-length=short-action
https://www.opticsplanet.com/leupold-backcountry-cross-slot-30mm-rings-med-matte.html?_iv_tube-diameter=1-in&_iv_ring-height=low,medium
In order to mount the Leupold VX-Freedom Scout 1.5-4x28mm Rifle Scope, to a Henry Big Boy Carbine you first need a compatible base. The Henry Repeating Arms Co Cantilever Scope Mount located at the link below will work with that rifle. The Leupold Quick Release Weaver Style QRW2 Rings located at the second link below will work with that base and scope.
https://www.opticsplanet.com/henry-repeating-arms-co-cantilever-scope-mount-for-h006-series-big-boy-rifles-bb.html
https://www.opticsplanet.com/v/174065-leupold-quick-release-weaver-style.html
In order to mount the Leupold VX-Freedom Scout 1.5-4x28mm Rifle Scope to a Ruger Scout Rifle, I recommend using 1 inch diameter medium height rings. The rings listed at the link below will work and will mount to the pircatinny rail on the Ruger Scout Rifle.
https://www.opticsplanet.com/leupold-backcountry-cross-slot-30mm-rings-med-matte.html?_iv_tube-diameter=1-in&_iv_ring-height=medium
For the Leupold VX-Freedom Scout 1.5-4x28mm Rifle Scope on a Savage 110 Scout Rifle I recommend using low rings. The rings at the link below will work.
https://www.opticsplanet.com/leupold-backcountry-cross-slot-30mm-rings-med-matte.html?_iv_ring-height=low&_iv_tube-diameter=1-in
Yes, the Leupold VX-Freedom Scout 1.5-4x28mm Rifle Scope will work great on a Marlin 1895. If you are not wanting to remove the rear sight I suggest using either a shoot through mount or a cantilever style mount. Here is one that should work with your set up.
https://www.opticsplanet.com/hawke-sport-optics-tactical-cantilever-weaver-scope-rings-1inch.html