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Most molds will drop at 452, so probably don't need a sizing die. Get the mold, measure the 'boolit', then buy the die if you still want to. Oh, and it sounds like you'll be fine with 452.
I have a 358 sizing die for my Lee press. It works fine, even though my boolits drop at 362. I just hit them with something like silicone spray first.
BTW a caveat about the lee 452-228-1r mold. The ogive is just one radius and some guns have trouble chambering it at 'normal' OAL's. I have to load mine pretty short before it chambers, and back off on the powder charge accordingly.
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