Yep, I did this a few years ago when I first started using Lapua .243 cases in my tight neck chambered .260.
On the recommendation from Walt Berger at Berger bullets, I now have a bit more clearance through the neck.
*That* only gives you 0.0005 clearance and most of us feel this is not enough. If you reduce wall thickness *for an increase in clearance in the neck* in my opinion you will end up with better accuracy and if you feel neck tension is not enough get a smaller sizing bushing. I think you will have a more trouble free operation this way.
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