This is not an abnormal situation with rounds such as the 35 Whelen and the 35 Remington.
However, If as said by Hank08, you do not over size your brass, the problem can go away and brass life is fine.
As always, in spite of what manufactures directions may indicate, always size brass to the very minumum which will still allow for easy and relyable chambering.
Because of manufacturers tolerences present in both chambers and dies, setting the full length sizing die down to touch the shell holder or allow the ram to "pop" over center at the top of the up stroke is asking for short brass life.
Especially if your chamber happens to be on the long/big side and your dies happen to be on the short/small end of the tolerences.
Yes, following the printed directions will in almost all cases make for easy chambering, but it is not the direction to take for the most consistant reloads and longest brass life.
Been there and done that, 40 years or so back.
Keep em coming!
CDOC