I use them on my 7mmstw, and have used them on my 300RUM, 8mmremmmag, 338x8mmremmag, and 375H&H, none of which are braked. If you use the correct size, they don't move under recoil.They can move on heavy recoiling rifles. On those I fold the eye piece all the way forward (flat on top of the scope). This prevents that completely but when I haven’t it isn’t great.