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 Post subject: dusting wads with mica
PostPosted: Mon Dec 14, 2009 7:20 pm 
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Joined: Fri Dec 11, 2009 7:12 pm
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typicaly what kind of velocity is gained by dusting wads with mica vs. dry wady?


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 Post subject: Re: dusting wads with mica
PostPosted: Mon Dec 14, 2009 9:58 pm 
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Joined: Tue Jun 02, 2009 5:02 pm
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about as much as is gained by adding another tenth of a grain of powder


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 Post subject: Re: dusting wads with mica
PostPosted: Mon Dec 14, 2009 11:17 pm 
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I would think that if there actually was a gain in velocity, it wouldn't be worth the mess and time taken to do it.


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 Post subject: Re: dusting wads with mica
PostPosted: Mon Dec 14, 2009 11:35 pm 
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SilverEagle wrote:
typicaly what kind of velocity is gained by dusting wads with mica vs. dry wady?


Typically, none.

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 Post subject: Re: dusting wads with mica
PostPosted: Tue Dec 15, 2009 9:22 am 
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If their wasnt a gain in velocity, then would chamber preasure be lowered?


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 Post subject: Re: dusting wads with mica
PostPosted: Tue Dec 15, 2009 9:24 am 
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No, not at all.

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 Post subject: Re: dusting wads with mica
PostPosted: Tue Dec 15, 2009 6:10 pm 
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Randy's right, but the mica does help with another situation. When I was loading Activ hulls, I would get occasional hull separations after five or six reloads if I was using the Activ wads, which seemed to be made of a stickier plastic than normal. After I began dusting the wads with mica, I never had that problem again.

Dan


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 Post subject: Re: dusting wads with mica
PostPosted: Tue Dec 15, 2009 6:21 pm 
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That's one I haven't heard of before.

I don't know what the coefficient of friction is on a typical shotshell wad, but it is very, very low. Adding motor mica or other "wad slick" type gimmick has done nothing across the screens that is meaningful. In one test, average velocity actually went down albeit by an average of only 12 fps.

If you want more velocity with the same shell, using a tighter choke, a longer barrel, or just an extended choke will give you a tad more velocity-- though not enough to matter.

Peak pressure happens inside the shell. Motor Mica would have nothing to do with that. To the extent that a light dusting of the stuff all over the wad adds a tiny bit of weight to the "ejecta," peak pressures would go up-- not down. Again, not enough to matter as a 100 degree day vs. a 70 degree day will give you far higher pressures than the mica treatment.

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 Post subject: Re: dusting wads with mica
PostPosted: Tue Dec 15, 2009 8:15 pm 
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It was a surprise to me, too, and not a pleasant one. I had reloaded a bunch of 20-gauge Activ hulls for my then 12-year-old son to use for doves. I set him up in some bushes overlooking a waterhole and could hear him banging away from time to time. After an hour, I went over to check on him and found the ground littered with 20-gauge hulls torn in half. He showed me a dove that was neatly decapitated (must have really centered the beak on that one as it was coming in!). At that point, I gave him some factory shells and took the rest of the reloaded Activs as well as the half-hulls on the ground, which he had never noticed.

Further investigation showed that the interior walls of the hulls were extremely rough, akin to coarse sandpaper. The soft Activ wads apparently had locked into the walls upon firing and took the front half of the hulls down the barrel. Fortunately, none of them stuck halfway. Wads made of harder plastic (Win, Rem, Fed, and CB) had never posed a problem. I acquired some powdered mica and gave the Activ wads a good dusting and reloaded a batch of hulls. No problems surfaced, even though they were the same age as the hulls that had failed.

Just to be safe, I shot the rest of my batch of Activs through break-action guns; my son was shooting a Beretta A303 youth model.

Dan


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 Post subject: Re: dusting wads with mica
PostPosted: Wed Dec 16, 2009 12:04 am 
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I get a higher percentage of reusable hulls using mica dust, mostly less petal shearing. I'm using very stiff Sam-1 wads that are abusive to my Federal 3" 20ga and GM 2 3/4" 12ga hulls, but I prefer them for Hevishot reloading. I've tried MM and TPS hulls, but don't like the patterns I get with them.


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 Post subject: Re: dusting wads with mica
PostPosted: Thu Dec 17, 2009 10:11 am 
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I have been using MM for years on all my hunting loads, especially those in the Activ casings. Definately eases seating the wad which is a big plus for me.


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 Post subject: Re: dusting wads with mica
PostPosted: Thu Dec 17, 2009 5:59 pm 
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Doesn't mica help cut down plastic fouling in the barrel and choke?


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 Post subject: Re: dusting wads with mica
PostPosted: Fri Dec 18, 2009 9:33 am 
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Smelly Benelli wrote:
Doesn't mica help cut down plastic fouling in the barrel and choke?



I have never had an issue with plastic fouling and I use the MM on all my hunting loads. Coincidence, I dont know.


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