Are you having trouble with cases going into the die or coming out of the die? If it's going in, it won't be the decapping/sizing mandrel giving resistance, it'll be too little lube on the neck or body coupled with new dies having no residual lube in them.
If you say your projectiles don't fit, but haven't tried seating them with your seating die, they shouldn't fit by hand. If they do fit by hand after sizing you have a big problem- no neck tension.
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