build me a 500yd ruger light rifle, 10lbs

[CJ n Wy]

Well let see its gota be a Ruger,less than #10,6mm and shoot to 500 yards.
A VT will weigh more than #10 so that puts that stock-barrel combo out!

The 6br you mentioned would do it but in field conditions your gona have to know your drop chart and range with precision!
The Ruger makes a great critter getter but it aint a BR gun and 500 yards consistantly is about the limit for most.
You already have a good shootin 220Swift and 25-06 so a 6-284 or 6.5-284 with a fast twist barrel seams like it would help out the range a little.
I've had luck getting to 500 yards with an old Ruger tang 8 twist 22-250 shootin the 75 grain Amax( but its over #10 too).Its a LOT better in the wind than the Swift with 55 grainers.

The 7 mag has dropt a couple of deer just shy of 500 yards and put the fear of god into coyotes out to 800 but its spendy to reload for prairie dogs Bottom gun in pic

If it realy has to be shot @ past 500 yards this old tang in 308Baer has the ability to get it done.It stays minute of deer to 1000 yards alright but has trouble with prairie dogs that far.