To answer your question quite frankly, there is very little difference between the two loads. As far a accuracy each gun may or may not have a load it likes better. My BHP likes the 124, my 6906 likes the 115, my Sig 228 will shoot either equally well as will my Khar. A marginal hit in self defense with a 115 or a 124 is still a marginal hit, a good hit with either is still a good hit. There is a chance a situation will arise where one load can outperform the other, but I think that realistically, unless you are an operator the chances are negligible, as shooters we all like to banter around which load is best. Honestly I think any modern reliable hollow point will serve you well.
Off soap box.
The 127 Ranger really is an awesome load. I think the 124 +P+ Hydrashock is probably very good also. I am currently shooting Federal 115 Hollow points in my Khar.
Charles
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