Any break action gun pistol is not the accurate as a solidly fixed barrell, like a bolt action ect.
The problem with the contender is that any pressure exerted on the forend or barrell will cause a significant shift in POA, like a bipod or pressure on the barrell. Even resting the forend or barrell on a shooting rest can effect it.
In order to shoot a contender pistol consistantly accurate you must sight it in and shoot it the same way you will hunt with it. Meaning off hand shooting or gently resting it on a shooting bench being very carefull to not rest the barrell or forend on any surface, ( you must rest the grip only and try and sight in it at 50 yrds. max).
I experimented for 3 yrs/ with a 223, 30-30 and 35 rem contender and found that they are very difficult guns to shoot consistantly accurate.
Here are some results 223 14" barrell contender with harriss bipod and burris 2-7 x scope, the best it would do is 7" groups at a 100 yrds.
Eventually converted barrell to a 18" rifle barrell with a reamed out 223 match welded flash suppressor and installed a shoulder stock on it and a longer hand guard , harris gipod and weaver 6-18 power scope, the best the contender converted to a legal rifle configuration it would shoot only 3-4 " groups at 100yrds.
I finally gave up on it and switched to remington xp100's in 7mm and 35 cal. The 7mm xp100 scoped would consistantly shoot .375" MOA for 3 shots at 100 yrds. A lot of you will claim it was me and not the gun that was the problem. But the example between the xp100 and contender show proof that it was the contender and not the shooter.