Yes, the Vortex Precision Extended Cantilever Mount will work on a Ruger Precision Rifle in 300 Win Mag. However, the exact model you need will depend on the specific model scope you are planning on mounting to the rifle.
This is an ideal fitment for that optic atop an AR-pattern rifle!
That would depend entirely on the diameter of the scope utilized, i.e., 1", 30mm, 34mm. If you have specific fitment questions, give us a call at 1.800.4VORTEX!
The Vortex Precision Extended Cantilever Mount mounts to picatinny rail.
The Vortex Precision Extended Cantilever Mount has a 2" offset.
If the mounting screws, torqued to 34-45in.lbs, are not securing the mount, I would recommend reaching out to Vortex Optics at 1.800.4Vortex for support!
Yes, the Vortex Precision Extended Cantilever Mount will work for mounting the Vortex Razor HD LHT 4.5-22X50 on a Sig Cross. The 30mm diameter models of the Vortex Precision Extended Cantilever Mount are models CM-530-20 and CM-530. Both of these will work, you will just need to decide if you want 0 MOA cant or 20 MOA cant.
The Vortex Precision Extended Cantilever Mount has a 2" offset.
In order to mount a Vortex Razor HD 5-20x50mm Rifle Scope to a Montana 1999 Rifle you will need 35mm diameter high rings. The scope base for that rifle can be found at the first link below. The second link will take you to a set of rings that should work for that setup.
https://www.opticsplanet.com/evolution-gun-works-hd-montana-rifle-1999-picatinny-rail-scope-mount.html?_iv_parent-gun-model=montana-model-1999
https://www.opticsplanet.com/v/pmr-35-126-vortex-precision-matched-riflescope.html
You would need the 35mm Vortex Precision Extended Cantilever Mount for that set up. The model number for the mount you need is CM-535.