Remember that electronic muffs are no better than their base NRR rating. The electronics only help you hear softer sounds, they don't help reduce loud sounds. Not many electronic muffs are rated over NRR 22 or so, and that's just not enough for me, especially indoors or at outdoor ranges with close stall roof and walls.
I like a really high NRR, and always use Peltor Ultimate 10s, with an NRR of 29 and a soft, comfortable earcup seal. The problem with high NRR muffs is that they're bulky and can get in the way when shooting long guns. In that case, I like to use slim muffs and earplugs. A good seal around your shooting glasses is critical, and a poor seal can let a lot of noise in even on muffs with a good rating. You can buy gel cups for some Peltor and Sordin muffs.
Some people say the total NRR rating can be misleading, as it's an average over a range of sounds, and muffs like the highly regarded (and expensive) Nordin Supreme Pro are effective, while only having an NRR of 18. I haven't used them, so I can't speak to that.
I'm pretty protective of my hearing, and don't like to take chances. I threw out all my old mediocre muffs.\
ETA:
Here's a recent thread from arfcom where this was discussed. Some pretty good info there.
I like a really high NRR, and always use Peltor Ultimate 10s, with an NRR of 29 and a soft, comfortable earcup seal. The problem with high NRR muffs is that they're bulky and can get in the way when shooting long guns. In that case, I like to use slim muffs and earplugs. A good seal around your shooting glasses is critical, and a poor seal can let a lot of noise in even on muffs with a good rating. You can buy gel cups for some Peltor and Sordin muffs.
Some people say the total NRR rating can be misleading, as it's an average over a range of sounds, and muffs like the highly regarded (and expensive) Nordin Supreme Pro are effective, while only having an NRR of 18. I haven't used them, so I can't speak to that.
I'm pretty protective of my hearing, and don't like to take chances. I threw out all my old mediocre muffs.\
ETA:
Here's a recent thread from arfcom where this was discussed. Some pretty good info there.

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