Few things to keep in mind.
I agree with
Bobk simply because if he saw the pics (I did not) than I'm pretty sure he's right. It would be my first answer, but I also cannot see the pictures. Every time you use a bullet from a different manufacturer, it may have a slightly different shape. Measuring the COAL of the loaded round is extremely important but when you use different bullets, that number is
going to change.
SAAMI sets (and we pay attention to!) minimum COAL because it can be a pressure issue. When you take a high pressure round and you seat a bullet deeper than before, you reduce the internal space for the combustion. Pressures increase as a result. This is merely
one obvious reason that we
develop loads -- we start lower than our goal and we work toward them incrementally so we don't find ourselves holding some manner of an "over pressure event" in our shooting hands.
If you can't chamber a round of .45 Auto, it's not likely to be a crimp issue, it's more likely to be a COAL issue, but this assumes that you did not OVER-FLARE your round to begin with. You can check this simply by flaring a piece, then running that piece (with NO powder and NO slug) in to your seat/crimp die. The piece of brass you end up with should fit easily and perfectly in the chamber of your pistol. Should enter freely and drop freely. If it does this, you didn't over-flare.
Of course, you do need enough flare to start the bullet. Less is best, use the LEAST amount of flare that still works.
With regards to COAL and pressures, .45 Auto is a little more tolerant than say... .40 S&W. .40cal runs 35k PSI max and it does so in a -SMALL- case for the job. That means tiny differences in combustion space means BIGGER jumps in pressure. .45 Auto runs far less pressure and gives you a little more margin of safety.
Again, if you aren't starting at -MAX- than you can work toward a goal before you put yourself in the position of doing something dangerous.
If you aren't familiar with terms such as SAAMI, ogive, COAL and others, you need to sit down and read a load manual. If you don't have a load manual, you need to buy one. If none of these suggestions make sense, you might consider the potential dangers of what you are doing and give it the respect it deserves before you continue.