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Did you resize the new brass?

New brass goes through the same steps as used brass.

Mike hit it on the head.
Resize the new stuff too. My first thoughts.

I treat new brass just like used brass - tumble first, then resize.

The plug in the powder die also bells the case mouth to accept the bullet. That should be the only resistance you encounter.

I suppose unsized cases might be enough larger that the plug fits inside easily, up to the flare.

I suggest starting the setup over, adjusting one station at a time, by the instructions, to see if you've missed anything.

Maybe someone will have better ideas.

Some brass is harder than other. If your brass that you have reloaded was some softer than the new I can see it being noticably tighter in the bell & powder die.

If you know you have your sizing die adjusted right, try this.

Load one round completely. Bullet, final crimp, everything.

Take the barrel out of your gun. Drop a factory load in, then one of your old reloads that worked well, then the new one. If they all seat in the barrel at the same depth, the new one drops in easy, smooth, is flush like the others, & not a tight fit load another 6 or so. Load a magazine. Hand cycle them. If they all go into battery like a factory or your good reloads, I think you should be good to go.

Marty is the expert here. I wish he would find this one & chime in.

That is the best Gauge you have.

I would go w/ it.
LT