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That's some great advice.

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...

It's 243 brass and in S&B so it's hardly tough to buy new. Heck you could buy bags of brass for the price of a K&M tool. I've got 243Win brass I can't even give away so I think it's all relevant....

No. All brass will eventually need a full size as the brass gets worked. Neck sizing is good for most cycles but it's important to have brass that fits your rifle. Nothing worse than finding your...

He has a collet die, plus any neck die will never FL size so another 1/4 turn (about 0.009") is just going to break or jam something.
Brass will flow forward every time it is fired. No case will...

What you will not be able to do will be too actually measure your head space unless you have a gauge to measure it with. I have a Hornady comparator for this. There is a possibility you can over work...

Get a FL die. I think this will solve your right to chamber problems.
My 243 was the only rifle I had that would develop neck donuts too. Have a check for this. Easy test is if a projectile will...

Your firing pin is skinnier than the hole it pokes out of in the bolt. The primer will extrude back and into the gap between the two, hense the little ring around the strike mark in the primer....