These Mec drop in bushings fit well and work smoothly. Be certain to use these bushings with an accurate powder scale because powder drops can vary from Mec bushing chart by more than +/- one full grain. Be prepared to bracket around your bushing choice until you find the correct powder drop. If you load a variety of powders consider the universal charge bar, also available from Optics Planet, you'll save money in the long run.
Pros: Easy drop in operation.
Cons: Can have substantial variations from published powder drop chart.
This review was written in the old system and had content requirements that are different than reviews written today.