People today have had "goodwill and integrity" bred out of them.
At the risk of appearing a total twat, you have had someone else shoot it just in case its you.
My 6.5SAUM bounces all over the place like a patron in a B&D parlour being whipped if you don't pay attention when you shoot it (groups accordingly) and use the unsupported forend technique which is all de-rigor today(unbraked and using a bipod).
but actually if you pay attention and hold that foreend it shoots quite well, 1/2 inch or less which a bit of practise on my part