Most sturdy tripod

BA73AC9A-C275-435D-BCFB-98DD7F73BB08.1618133220.jpeg

Gitzo tripod with RRS ball head. If it’s good enough for the PRS boys, you’d think it would work for air guns; it does. Very light, very expensive, not bulky.
 
For shooting standing Gitzo https://www.bhphotovideo.com/c/product/1328236-REG/gitzo_gt5543lsus_systematic_tripod_ser_5_4s.html  looks like a perfect option

If too much money, lots of guys here like Leofoto, for my next HD tripod I will probably go with this guy https://www.bhphotovideo.com/c/product/1540121-REG/leofoto_lm_405c_summit_series_carbon.html

I own Manfrotto MT190xPRO4 https://www.bhphotovideo.com/c/product/1010693-REG/manfrotto_mt190cxpro4_190cxpro4_carbon_fiber_tripod.html with Leofoto LH-40 head https://www.bhphotovideo.com/c/product/1375175-REG/leofoto_lh_40_low_profile_ball_head.html?sts=pi&pim=Y and I like it a lot but I shoot sitting on the ground so I was looking for something "compact' and light and wouldn't recommend this tripod for shooting standing... LH-40 on other hand I will recommend to everyone.

B
 
I purchased a Artcise AS90C carbon tube rated for 44 KG top weight for my powder burner and am currently adapting to my Kalibr Argus 60 to an arca swiss pad for it. It has a 75mm articulation ball built in at the very top giving 34 degrees of angular freedom. I did not need any addition ball head.

https://www.amazon.com/Carbon-Tripod-Tripod-ARTCISE-Adapter-Fiber-40mm/dp/B087PHXNTN

or Innorel RT90 version

https://www.amazon.com/Carbon-Tripod-Professional-Birdwatching-Adapter/dp/B07H8V8WWM/ref=psdc_499310_t3_B087PHXNTN

The Innorel in use with AR here about 2 min in: https://www.youtube.com/watch?v=OWUdEgfDz58

Very solid, relatively inexpensive at $317.00, and readily available.
 
Any tripod with a leg diameter of between like 40-44mm is going to be the most sturdy. Tripods with a leg diameter of 34-38mm are also going to be pretty darn sturdy too as long as you buy a quality unit. The Innorel that Dairyboy uses is a good sturdy tripod at a great price. Sirui, LeoFoto and many other brands are great too for the price, you just need to look at the specifications... Leg diameter, number of sections and wall thickness. RRS and Gitzo are some of the best but are very expensive. They are really not necessary but they are great if you want to spend $1000-$1400. Well, I shouldn’t say not necessary, the set up WillM posted a picture of is freakin awesome! I can’t afford it though! 😂 I used to own a RRS BH-55 for my big lenses and that thing is a beast, expensive but the best. The BH-40 is also the bomb! The low profile bowl adapter he’s using are super stable, Dairyboy has a similar bowl adapter with a great head too! There are so many great options available these days if you look at B&H or some of the other big photo retailers. A quality head is important too. Other things like keeping the gun centered over the head, keeping the tripod as low and the base as wide as possible without extending a bunch of leg sections and not using the center column if you have one, also greatly contribute to stability. Using straps and additional supports to brace the gun are also extremely useful in increasing stability while shooting too.

Let us know what you decide on.

Stoti
 
I use 2 different tripods for photography. Both would be great to use for an air rifle, as well.

The most expensive is the carbon fiber Induro classic, with a maximum payload of 35 lbs. (One has to buy a ball head, too.)

https://indurogear.com/clt203-classic-cf-tripod-2-series-3-sections/

Less expensive, but very good, is the aluminum Benro Adventure series with a maximum payload of roughly 25 lbs. (Includes a ball head.)

https://benrousa.com/adventure-al-series-2-tripod-kit-4-section-flip-lock-ib2-head/

I know that the payloads sound high. However, one wants a rock solid tripod for photography. The Benro has traveled many tens of 1000’s of miles with me and is very reliable.