Greetings @Pommy,
One thing that you might want to try rather than expensive and hard to get dies is firing a light load in the cases when the become difficult to chamber. At one stage I used to neck size a lot of my cases and also started to use reduced loads for 100 and 200 metre shooting in my .308. I found that after one light load cases that previously were tight much easier to chamber. This triggered a memory of someone writing that you should keep cases used for light loads separate from those used for full power loads as the headspace was reduced due to the firing pin strike and the primer backing out. You may want to try a light load in some snug cases to see if it works in your case. I was using 38 grains of AR2206H behind the 155 grain plated projectiles. This likely gave a pressure in the mid 30,000 CUP area. From memory the Handloader article listed powders like H322 and IMR8208 so you should be able to find a load for AR2206H which does the trick. I will have a better look at the article when my mag arrives later this month.
Best of luck and PM me if I can help.
Regards Grandpamac.
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