I don't know about the accuracy difference but the 2400 is quieter. I've been using it in the 300 and the 510 with very good results. According to chronograph data we worked up the 2400 has been the most consistant in the velocity dept.
At the moment I don't have a 300 to do any accuracy testing with so I can't help much with that angle....
The N110 is cleaner burning than most any of the powders I've tried but for the cost of it I don't think I'll be using it much anymore. H110 is out for sure due to the considerable variations in velocity and pressure that occur with changes in temp.
One other thing you might look into is H4227. Its a slower powder like the N110, its available and lower cost than the N110, it burns pretty clean and so far has been pretty consistant in the 510. If you want to try a slower powder its another possibility to look at.
Frank
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