The SLIK pro 700 DX tripod appears to be heavy duty and very stable - it's rated for 20 pounds but looks and feels like it can hold 40 pounds. Cost is $100.00 If you like the RRS ball head appearance and function, then you'll probably like its clone - the Leofoto LH-55 ball head with Acra-swiss mount for $250.00 new from B&H Photo and other retail locations. All you will then need is a Acra rail for your rifle, which can be short or full length - your preference - or you could go with a saddle, if that's your preference.
I liked the Night Stalker, as mentioned by AWS for both the cost and build quality and had one on order. It's back ordered and currently no delivery date is known due to this virus scare, so I was allowed to cancel the order and went the SLIK and LH-55 route. It's a bit heavy but unless you're going on a walk about - it'll be fine for most.