I used a Vortex carbon fiber tripod on a bench for this

I still need to get a bipod and bag.
Yeah, get a GOOD bipod and bag. Not a $29.95 Caldwell pos. There are plenty of threads here on SH to confuse you about bipods, but it's hard to go wrong with Atlas, MDT, or Accu-TAC. There are plenty of other good ones. Despite what haters say, Harris bipods are fine - if - IF - they are upgraded with a Pod-Loc and an ARCA adapter.
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Then get bipod and bag low and stable on a bench. If you're young and limber enough to shoot prone, you still want to get the rig as low as is comfortable.
EXAMPLE: Met a guy on range with a new, fairly decent rifle, good rear bag (GameChanger Shmedium) and ok bipod (MDT Ground Pod). Rifle was a thumper (7 PRC) but had a good brake. Decent ammo. He was struggling with groups / zero.
Problem was obvious to me: he was sitting at a low bench so he had that bipod cranked up to near max height and had TWO bags under the stock toe. He had both hands on the rifle grip instead of support hand manipulating the rear bag. The whole thing was wobbly no matter what he did with support hand, so it was surprising to me that he did as well as he did.
I showed him how to get everything low and stable, but a lifetime of bad habit made it hard for him to use his support hand correctly.
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As others have said, a class led by a competent instructor can be a $$ saver in the long run. I just suggest asking here or locally for advice on such instructors... because anyone can hang out a shingle and run a "class."
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Ain't nothin' wrong with American Gunner ammo. My son just built his first precision rifle in 6.5CM based on a Zermatt Origin action and Bartlein barrel. I found a few hundred rounds of AG ammo from when I first started that I had forgotten about; it's great beginner ammo. In his rifle, it's consistent 1/2-MOA or better at 100, and he easily keeps it on a 2-MOA plate past 500. He hasn't qualified yet to use the 1000 range, so he asked me to try his rifle there. He gave me the elevation setting based on his 100-500 yard dope. It was nearly dark and we were out of time so went straight to 1000 with no shorter 600-800 yard trials. Two shots, two impacts on 24-inch plate.
Declared victory and went home. I would never bet on that happening again.