Do the FL thing and see how that works. I'm picking if it's tight to chamber this will be your problem.
It's not a F Class rifle so to FL size regularly won't hurt. I like to know my neck tension is as consistent as I can get it without getting too wound up about it so I have a preference for Redding Type S dies. My last 243Win I only had a Type S FL die and it was just as accurate as any rifle I have owned. FL sizing every 4th time should be a good start I'd guess but there are plenty of more experienced reloaders on here who may have better advice.
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