Castle rock,
I have Howard Leight and Caldwell electronic muffs, and they worked great. I got them on-sale at Natchez shooters supply for $35 to $40. The NRR was listed as 22 or 23. Besides shooting I have used them for woodcutting and construction... fast forward about7 years and I needed new ones.
I bought two pair of Walkers as replacements (they were approx. $45 at sportsman's) last year and took them back to the store... The electronic shutoff was not as fast as the above brands and I would get a little of the shot noise prior to shut-off.
Natchez shows howard leight model "impact pro electronic earmuff" (nathez's number; F10HQR01902) that claim a NRR of 30. They are much bulkier than the Leight models that have a NRR of 22 though and therefore may be a bother at the range.
Jerry
The earplug superstore link referenced above is within a couple of dollars of Natchez; BUT after looking at their $20+ shipping think I'll go with Natchez.
https://www.earplugstore.com/howard-leight-impact-pro-hunting-earmuffs.htmlhttps://www.earplugstore.com/bilsom-impact-sport.html
