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I installed a clamp on muzzle break from Grizzly Gunworks for my Tikka T3 HB 223.there is no more muzzle jump but it is louder other than being loud I do not see any change.Good luck
About the POI - it depends on how accurately the barrel was threaded as well as how accurately the brake was made... ideally the bore of the brake is under size allowing it to be bored for bullet clearance while indexed to the barrel.
Have two custom machined and threaded to my .308 and .270. No noticeable POI shift but benefit being reduced felt recoil. Detriment, louder, not that I mind.