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 Post subject: Drilling and threading the shot side of a Mec charge bar
PostPosted: Sun Feb 21, 2021 4:59 am 
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Location: Shanghai, Seattle & Sydney
Hi
I was hoping someone could remember who it was that drilled and threaded a Mec charge bar on the shot side, lengthways so as to adjust for variations in shot pellet weight. I was thinking how could this be a problem until it happened to me. The one and only company that supplied reloaders with excellent quality shot shut down and supplies have been sourced from Peru. The problem is the shot bar which was tuned for the previous shot brand is now throwing too much shot weight for all my gauges. If I threaded the bar I could have much control with the shot weight.




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 Post subject: Re: Drilling and threading the shot side of a Mec charge bar
PostPosted: Sun Feb 21, 2021 6:57 am 
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I did, if you mean like this.

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Steve

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 Post subject: Re: Drilling and threading the shot side of a Mec charge bar
PostPosted: Sun Feb 21, 2021 8:00 am 
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Joined: Tue Oct 06, 2009 11:51 am
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A local tool shop can do this.


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 Post subject: Re: Drilling and threading the shot side of a Mec charge bar
PostPosted: Sun Feb 21, 2021 8:14 am 
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Joined: Thu Dec 06, 2012 4:21 pm
Posts: 727
So little adjustment needed can’t see how a threaded insert would work . Probably something I am missing.

Easiest way is buy a new bar that’s smaller then open it up to suit your desired drop. That’s how I “adjust” Bonanza pistol powder measures. No longer made or available bushings are often cheap on eBay. They have a bottom so deeper is the way to increase

Mec bar is a through hole so expanding from smaller is needed. I would bore in the mill, could be done with progressively larger drill bits. It takes a pretty big bit though. Trial and error work. Weigh the drop make a light cut then weigh again. Graph how much increase you get per cut you can hit the mark fairly well.

Having said all that I have never adjusted shot bar or bushing drops, switching to a different bar/ bushing instead. Powder another thing.

Opps now I see plug in the end. That’s simple and ought to work.

Bass


Last edited by Bass3 on Sun Feb 21, 2021 8:16 am, edited 1 time in total.

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 Post subject: Re: Drilling and threading the shot side of a Mec charge bar
PostPosted: Sun Feb 21, 2021 8:15 am 
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chips&clays wrote:
A local tool shop can do this.


Hell, it's aluminum, anybody can do it.....


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 Post subject: Re: Drilling and threading the shot side of a Mec charge bar
PostPosted: Sun Feb 21, 2021 8:28 am 
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westwind wrote:
If I threaded the bar I could have much control with the shot weight.


I no longer shot 1 oz., so if you want this one its $20.00 shipped. Without a "pulley tap" you can't make one because a normal tap is not long enough.

Bass3 wrote:
Trial and error work. Weigh the drop make a light cut then weigh again. .


Then take the bar out again, set up in the mill and cut again, then weight again. Rinse and repeat until you have it correct.
My way was one calculated cut, install the set screws and dial in. Plus, if the next batch is heavier/lighter and I want to mess with it I can dial it back in. Lastly it was a fun project to do on a very cold Wisconsin day.

Steve

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 Post subject: Re: Drilling and threading the shot side of a Mec charge bar
PostPosted: Sun Feb 21, 2021 8:39 am 
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Can do without a pulley tap. Just drill out oversize part way down. Regular tap can tap through..


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 Post subject: Re: Drilling and threading the shot side of a Mec charge bar
PostPosted: Sun Feb 21, 2021 9:09 am 
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chips&clays wrote:
Can do without a pulley tap. Just drill out oversize part way down. Regular tap can tap through..



Just leave enough material for 2 set screws, 1 to adjust and 1 to lock in place.

Steve

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 Post subject: Re: Drilling and threading the shot side of a Mec charge bar
PostPosted: Sun Feb 21, 2021 9:29 am 
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Joined: Sat Apr 20, 2013 7:43 am
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Wouldn't shot from Peru be called Eagle Shot ? With it being heavier with less antimony
than most "redropped" shot , Why would anyone go to such effort as to think it needed
adjusting ? I know , a idle mind is a Devils workshop , if , there's a will , there's a way !


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 Post subject: Re: Drilling and threading the shot side of a Mec charge bar
PostPosted: Sun Feb 21, 2021 9:41 am 
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Ravenanme wrote:
Why would anyone go to such effort as to think it needed adjusting ?


For perfection, something we all strive for every time we go shoot.

If you think this was a lot of work, go check this out. {hs#

https://www.shotgunworld.com/bbs/viewto ... 3&t=528566

Steve

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 Post subject: Re: Drilling and threading the shot side of a Mec charge bar
PostPosted: Sun Feb 21, 2021 10:21 am 
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Eagle Shot may not be as good as Remington, Lawrence or West Coast but it still has enough antimony in it to drop light in an unaltered MEC bar.

Folks complain about certain loads having a concave crimp, correct? MEC bars drop even Eagle Shot light by at least 1/16 of an oz. (in some cases almost 1/8 oz. light) light on shot. Light shot drops affect patterns, ballistics and crimps which also affects ballistics.

Based on lead shot with a 4% antimony content, which approximates Eagle Shot.

1/16 oz. is 22 #7.5 lead pellets, 26 #8 lead pellets and 37 #9 lead pellets.

Certainly not a big deal, but when you wonder why some loads don't fit correctly. There's your answer.

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 Post subject: Re: Drilling and threading the shot side of a Mec charge bar
PostPosted: Sun Feb 21, 2021 10:26 am 
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YevetS wrote:
Ravenanme wrote:
Why would anyone go to such effort as to think it needed adjusting ?


For perfection, something we all strive for every time we go shoot.

If you think this was a lot of work, go check this out. {hs#

https://www.shotgunworld.com/bbs/viewto ... 3&t=528566

Steve


Like my last statement implied...Multi-Scale bars would be better ? maybe not !

Dogchaser can make my head hurt....but , my adjustable bars ease the pain !


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 Post subject: Re: Drilling and threading the shot side of a Mec charge bar
PostPosted: Sun Feb 21, 2021 11:09 am 
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Honestly?

If I had thought of it, I would have drilled and tapped the MEC bar just like YevetS did.

I like my UCB's but IMHO the shot side of the MEC bars is the issue. The powder bushings work just fine in most applications. Maybe with the 28 and .410 you would want the UCB, but 20 gauge and larger do well with powder bushings.

1 and 1 1/8 oz. MEC bars dropped 40 grains or so light using Lawrence and West Coast #7.5 shot in my 9000H.

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 Post subject: Re: Drilling and threading the shot side of a Mec charge bar
PostPosted: Sun Feb 21, 2021 2:33 pm 
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Quote:
The problem is the shot bar which was tuned for the previous shot brand is now throwing too much shot weight


I am really curious about how much difference we are talking about. What are the different weights thrown with the two different brands of shot?

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 Post subject: Re: Drilling and threading the shot side of a Mec charge bar
PostPosted: Sun Feb 21, 2021 3:32 pm 
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Tal/IL wrote:
Quote:
The problem is the shot bar which was tuned for the previous shot brand is now throwing too much shot weight


I am really curious about how much difference we are talking about. What are the different weights thrown with the two different brands of shot?


For me personally it was not the difference in weight between 2 brands that started this. My 410 loads were about 8% low of #8.5 shot and rattled.

Steve

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 Post subject: Re: Drilling and threading the shot side of a Mec charge bar
PostPosted: Sun Feb 21, 2021 3:33 pm 
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dogchaser37 wrote:
Eagle Shot may not be as good as Remington, Lawrence or West Coast but it still has enough antimony in it to drop light in an unaltered MEC bar.

Folks complain about certain loads having a concave crimp, correct? MEC bars drop even Eagle Shot light by at least 1/16 of an oz. (in some cases almost 1/8 oz. light) light on shot. Light shot drops affect patterns, ballistics and crimps which also affects ballistics.

Based on lead shot with a 4% antimony content, which approximates Eagle Shot.

1/16 oz. is 22 #7.5 lead pellets, 26 #8 lead pellets and 37 #9 lead pellets.

Certainly not a big deal, but when you wonder why some loads don't fit correctly. There's your answer.

I'm not finding this to be the case. My 3/4oz bar drops light, but not by much.
3/4oz = 328.125 grains, my actual drops are 323 ~ 326.5 grains. So we are talking 2 ~ 5 pellets.

BTW, this is with Eagle #8 shot.

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 Post subject: Re: Drilling and threading the shot side of a Mec charge bar
PostPosted: Sun Feb 21, 2021 6:01 pm 
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Joined: Sun Mar 13, 2005 6:00 pm
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Location: Shanghai, Seattle & Sydney
Thanks everyone for your inputs! The reason I’m doing this is it’s a more precise way of adjusting the shot weight without taking metal away or adding tape to get the shot weight right. Atm without doing anything the new shot went from NSSA legal to overweight! It’s also might be the shot is smaller then advertised so I’m getting more BBs. Who knows but when it comes to confidence in my loads I want to know I’ve got everything dialed in.


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 Post subject: Re: Drilling and threading the shot side of a Mec charge bar
PostPosted: Sun Feb 21, 2021 9:21 pm 
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I do find Eagle Shot to be small. I have a bunch of #9. Wish I had bought #8.5 to conform to USA #9.

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 Post subject: Re: Drilling and threading the shot side of a Mec charge bar
PostPosted: Tue Feb 23, 2021 9:44 am 
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There is a guy at my club that drilled and tapped 2 of my bars like pictured above so the shot cavity is adjustable and they work great. I use the 1 1/4 oz bar to drop 1 1/8 oz loads and a 1 3/8 oz bar to drop 1 1/4 oz loads. I can dial right in on the shot weight when switching from 9 shot to 7 shot in a 1 1/8 oz load or from 7 to 5 shot in the 1 1/4 oz load. There is some variation in drop weights between the different pellet sizes and shot brand so being able to adjust really helps with stack height and crimps. I wouldn't say that the modified Mec bar is any better or worse then the Universal charge charge bar as they both accomplish the same thing. I don't have a set screw to lock the adjustment bolt but I've never had it wander.


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 Post subject: Re: Drilling and threading the shot side of a Mec charge bar
PostPosted: Mon Mar 01, 2021 4:28 pm 
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Location: Shanghai, Seattle & Sydney
Thanks for your input that’s exactly what I’m aiming to do. I only reload for skeet shooting so making sure the shot load is correct is important Re NSSA rules.




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