Just so we are all following each other...
OAL has nothing to do with the ability of the cartridge to chamber. OAL is the length of the cartridge, from tip of bullet to back of case. It's only used to make sure the Cartridge will fit in a magazine.
If you measure from the ogive you will have a better idea of how deep the bullet must be seated into the case without jamming the lands.
I suggest you start by
1. resizing a case, and try chambering the empty case. If it doesn't chamber, get new brass.
2. seat a bullet the same depth (measured from the ogive) as the cartridges you loaded but would not chamber.
3. If it won't chamber, seat it deeper until it does.
CLERIFY #3: see if it chambers without driving the bullet deeper into the case. Measure, from the ogive, before and after chambering. Also, try this with "loose" neck tension so the neck barely holds the bullet in place. If you are into the lands, the bullet will likely stick in the rifling when removing the case/bullet combo. It should stay with the case when removing, but not get pushed deeper into the case, either.
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