I take mine out and use ear plugs.

A friend who I shoot and ride motorcycles with removes his for both types of fun, carries them for use once he is done.

My audiologist told me that the noise cancellation would only be good for behind well behind the firing line.  He said to wear plugs and muffs when shooting.  Also, when I wear the muffs over the aids it gets uncomfortable as the muffin is pushing on and the aid.
Cheers,
Steve

My dad wears the hearing aids he got from the VA, they are completely in the ear, not the ones that hang over the back. They are set on the bone due to blown out eardrums. He shoots with earmuffs over the top because he cannot understand range commands without them, he can I only tell if someone is talking

My late Brother was a guide and wrangler for several outfitters in Western Wyoming and worked in the 'Thorofare' and South area. He was in the business along with being a driller on gas rigs for about 15 years. One season he a had a pair of elderly clients with sweet elk tags and was putting together a twenty mile horseback ride up to his base camp. As usual he wanted to set down the rules, pair up the two hunters with the right horses, inspect rifles and sight in then rig and tie down his pack animals. One gentleman showed up with two rifles, a Winchester 30-06 and his new custom built 358 Norma that he said he'd only shot once but was going to be his go-to rifle. 

Both hunters were taken to a rather crude bench consisting of a log elevated on 2x4 X braces. One guy shot his 7 rem mag to 3" which was fine. Then the older gent takes his 358 Norma, settles in,  and lights off a factory Norma 250 grainer. The rifle slams him hard as my Brother claimed he failed to keep it tight. The recoil hit him, knocked off his glasses but worse knocked his denture plate out of his mouth. He jumped up startled but in doing so stepped on his denture plate smashing it. According to my Brother he lived on soup, Ramen Noodles and pancakes until they packed out. 

Not hearing aids but a ridiculous scenario. My old Brother was going to write a book about these experiences but passed too soon at a hospital in Salt Lake. Shamefully while he was dying ( tooth infection ) his two prized mules and three horses and tack were stolen. 

Rick

Guys,

Thanks for all the comments & observations.  After starting this thread I spoke with a couple of guys that shoot at my club.  Both keep their hearing aids in while shooting with electronic muffs.  Although I have yet to attend a match since getting the hearing aids, I tried them with two brands of muffs which does not seem to be a problem, i.e., no feedback & the muffs are comfortable with the hearing aids.

BTW, for those of you considering hearing aids, prior to getting mine from the VA, I extensively researched the well-know high-end brands.  If I had to pay for them, the Philips brand through Costco would be my first choice - highly rated & with features & quality close to the substantially more expensive Starkey brand which is what the VA gave me.

Wayne

I never wear mine when shooting.
I would suggest you make sure the person fitting them is very fully qualified when they ajust them to yours ears.
Just because they make sounds louder doesn't mean you can hear better.
Mine were fitted by an unqualified guy in the shop and it was only recently I had them looked at by university trained woman who had her diploma from a good university on the wall and the difference was amazing.
I can control mine from my phone as to the how loud and whether indoors or out or in a restraurant. 
I don't like the damn things and only use them for the television.
For shooting I find that with my Walker electronic muffs I can hear all range orders.
I personally think most of these so called hearing aid places that seamed to spring up like mushrooms are a bit of a rip off.