Winchester primers should be softer than CCI primers and might be a reasonable short term solution.
Federal and Remington primers are also softer than CCI.
I use CCI in my semis because they are harder.
However, for this rifle, I would recommend you make sure the firing pin is not being hung up occasionally.
I'm presuming that the spring is strong enough because it gives an adequate primer strike 80% of the time.
Since it is a new rifle, there might be a burr in the firing pin channel.
I doubt the bolt is dirty, but it could possibly have some crud left in the firing pin channel from manufacturing, although that is unlikely.
You may get lucky and whatever is binding might wear away, but that may take a while.
Since it sounds like you haven't fired a whole lot of rounds with the new rifle, I would be more concerned with the light strikes because they will only get worse as residue builds up in the firing pin channel.
I had long term residue build-up cause a firing pin on my .270 Winchester to keep the firing pin extended.
Of course, the next round I chambered fired as I closed the bolt.
Luckily, the barrel was pointed down range at the time.
But, I is not something you expect or want to happen.
I cleaned the crap out of that bolt and it never has happened again.
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