I started sniping again in Tarkov and I've been using the M700 as I enjoy how much you can customise it, but recently I was trying out the T-5000 and I noticed that there's a massive difference in how much your aim gets thrown around when you're ADS'd and chambering a new round. So I went into my hideout and tested the two guns side by side.
When testing, I kept as many parts the same as I could, so I used the same suppressor, ammo, scope and scope mount. There's also a side by side comparison of the guns so you can see the attachments/stats (Just as an aside, my sniper rifle skill is at level 4 right now).
I hadn't seen anyone talk about this before, so I thought I would bring it up just in case there's something that I'm missing, but I'm fairly certain that how much your aim gets thrown around is just intrinsic to the gun, as if it had to with recoil or ergonomics, then the M700 should throw your aim around less.