I just saw that you shot it over the bonnet of your car. There is no way you can tell if you have a bedding issue by shooting a group over the bonnet of your car with ancient greek surplus ammo. That group is not worth the cardboard you shot the holes in.
There may be nothing wrong with it.
Check the muzzle and try and photograph it and put it up here. Put a photo of the whole rifle up, and also show us the mounts and rings you are using. There were some goddawful mounts made for .303's over the years.
Shoot it properly over a rest with some commercial ammo. Sellier and Bellot preferably.
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