You would be incorrect.Just full length size and it should cure your problem. Your load isn’t your problem.
As been mentioned. .502 reamer at the .200 line, a ring die or a custom sizer die to match your chamber.
I’m going the ladder. My issues aren’t cured yet but time will tell.
If you don’t know your reamer specs, it’s hard to point you in the correct direction. Cigarcop just posted 3 reamers for sale. My reamer matches his pretty close.
While I’ve seen 2 others that are .5009, .5029 and Alex Wheeler says for some brass and sizers, your chamber needs to be .502 at the .200.
I’d ask John Whidden what his sizer reamer specs are. And yes, I’m using a Whidden FL Bushing Die. Not for much longer. This is no disrespect to JW, it’s just his die no longer work for me.