when I chamber a round the bold is really hard to seat down
I've read some of the other responses, where you confirm factory cartridges.
But what about the rifle? Is it new, s/h standard, or custom, with a new barrel?
My thoughts
Take it to a gunsmith before you shoot it again.
However, before you go, you could also
a. Use a micrometer to measure the "case" length so as to compare it with the appropriate specification. What is the cartridge? I will send you details.
b. Pull the cartridge to remove bullet and power.
Then cover the case with felt tip marker pen.
When it's dry gently chamber the case a few times, upto the point of mild resistance.
This should scuff the ink off the case where its catching the chamber.
Repeat until you get a clear confirmation of the contact point.
M