You need to give us an idea of your loads, and it would help if you had pictures of your loaded and fired reloads.
I will say, regardless of your loading data, if your SAKO functions perfectly with factory ammunition, but not your reloads, I can say with a 99.999% expectation of being correct, your reloads are too hot.
Now what is causing that, not enough information to really provide a good analysis.
Some things to consider. Always trim your cases. Cases grow the most on the first firing, if you did not trim, it is highly likely the case neck is pinced in the throat.
How do you measure your powder charges? Scoops or do you weigh?
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If I'm not shooting, I'm reloading.
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