The brass needs to be resized. The bullet should not prevent the cart from chambering. If the bullet is seated in the case too long it will either get pushed deeper into the case by the rifling or it will simply push into the lands or both.
To confirm whether the brass needs full length resizing or , at least, shoulder bumped back, try chambering the brass without a bullet in it and see if it will or not. My guess is the bullet is not the issue.
Also, "ogive" is not a concept to be understood. It is simply the part of the bullet that is larger than the taper near the tip that you use to measure length of your seating from.. You measure it with a tool like a donut that will allow the tip to pass through and stop at a constant dimension (the inside diameter of your "donut tool") so that you don't try to measure from the tip of the bullet. The tip is easily deformed and rarely consistant in it's overall length. It is important to understand that your tool for measuring from the "ogive" will likely give a diferent result than my tool will because they are not constant or fixed dimensions from tool to tool. You just want to be sure to always use the same tool so you are measuring from a consistent point.
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