Some have touched on this already but if you have given the rifle a check over (screws tight etc) then my next step is always me (The shooter) You may be hitting 20cm at 100m, but what is the rifle doing? And how much time was between the 10 shots you fired?
For testing your shooting, there are a number of ways to try.
Get someone else who you know is accurate and have them shoot a group.
Get someone elses accurate rifle that you know shoots accurately and try that yourself in the same seated position you were in.
Get a .22LR and shoot the same sized target at 50 metres and see what you get
Or better still, Set yourself up on a picnic table or portable bench and shoot from a seated position with rests under the rifle at the fore end and butt. Sighting in is best done by taking ALL the shooters variables / wobbles / variations out of the equation. You need the scope to match the bullet impact. Practising should be done without these aids as you would shoot when hunting, but to get that confidence that the rifle will shoot where it is aimed you need it sighted in correctly.
Trying other ammo can help, but I would not think it would make that much difference normally.
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