Brad, if you can't set fired case shoulders back far enough with the die and shell holders you have, your rifle chamber may well be a bit short. Others have mentioned this.
I'll add that if it's a standard cartridge headspacing on its shoulder, I'd find a friendly gunsmith to stick a GO headspace gauge in it and see if the chamber's too short. Then you'll have all the good information and be able to do one of two things:
* Get a shorter/lower shell holder; .120" perhaps, instead of the standard .125".
* Grind off a few thousandths off the bottom of your sizing die or the top of your shellholder.
There's a slight chance the die's chambered a bit too deep and it's relative headspace to the shell holder is too long. One can also use a headspace gauge to check this out Most full length sizing dies won't let a GO headspace gauge fit in them with their bottom against the shell holder. This is what's needed to set the fired case shoulder back some nominal amount.
I once put a .270 Win. barrel from an old Model 70 into a newer one and it had .003" too short of headspace. My full length sizing die barely set fired case shoulders back enough to let the bolt close. I took about .005" off the bottom of the die and it worked out well. Most factory ammo would chamber in that barrel with no bolt binding at all.