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My rule of thumb is when I get close to 150 gr in bullet weight and will be using it in a semi I start thinking about crimping. The reason behind it is a 150 grain bullet has enough mass that if slammed into a chamber by the action the bullet can become unseated. This will cause pressure to drop in a subsonic round low enough that the bullet will not exit the barrel . Many variables involved such as bullet weight, length, neck tension and action speed. Your bullet may be long enough to not come out even if it wanted to. If you have a semi the easiest thing to do is measure overall length and hand cycle one from the magazine. Remeasure it and see if it is acceptable to you. Non semis are not as big a problem although there are those who crimp for everything. Personally if I am trying to put five into a .1" group I wouldn't consider crimping but then I haven't come close to that with a semi yet.
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