According to the X-Treme website, your bullet has a large initial ogive radius so your 1.228" minimum COAL is correct. But because it is a plated lead bullet (and not a much harder jacketed bullet) it can be loaded with the bullet in contact with the leade if the cartridge will fit in the magazine and feed OK. The 1/16" rule applies to jacketed bullets. Speer's advise to "put on a tight crimp" to avoid unburned powder is hogwash: tight crimps on bullets with no crimping groove do nothing but decrease the case's grip on the bullet and this should decrease pressure and increase the amount of unburned powder. You need "crimp" only enough to straighten out the case mouth and snug the case mouth up against the bullet:
After de-flaring (I don't like to use the term "crimp") the case mouth OD with a 0.452" OD bullet in 0.0105" thick brass will 0.473". 0.473" is the SAAMI maximum case mouth OD for the 45 Auto cartridge and it should feed OK unless your chamber doesn't meet SAAMI specs.
But I can't offer any advise on the accuracy and other unburned powder issues. Never used your powder.
Regards
When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]
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