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 Post subject: MEC 600 Jr quirks
PostPosted: Mon Jun 08, 2020 10:54 pm 
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Joined: Sun Apr 19, 2020 9:37 pm
Posts: 6
I picked up a Mec 600 Jr second hand. It came with an assortment of wads and Winchester AA hulls, the newer HS type. I have a few problems with my 600 Jr. I have loaded about 200 shells on it thus far. My recipe:

cb 4118-12b Windjammer
29 bushing drops 17.2 grains Hodgdon Clays
CCI209 primers
Winchester AA HS hulls

1 1/8 oz charge bar
7.5 shot - I dripped this myself. It's out of round as I'm still figuring out the whole process.

My main problem right now is that the three adjustments - cam, crimp and pre-crimp have all been wandering on me. It seems like I can't load 50 shells without having to make another adjustment. Is there a good solution for this? I posted elsewhere and someone suggested vibratite. I have some on it's way. I figured I should ask first though.

I have some issue getting a good crimp. I think the shell will start to buckle before I can get the right amount of crimp. I understand it should have the thickness of a dime.

Lastly, it seems that the primers aren't seating perfectly flush.

The press came with an assortment of wads. Here is what was included:
cb 3118-12a
cb 4118-12b
remington sp12
waa12 blue duster

Ideally I'd like to figure out what will really work so I can just buy bulk and bang them out.




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 Post subject: Re: MEC 600 Jr quirks
PostPosted: Tue Jun 09, 2020 10:11 am 
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Location: S.E. Wisconsin
weeple2000 wrote:
My main problem right now is that the three adjustments - cam, crimp and pre-crimp have all been wandering on me. It seems like I can't load 50 shells without having to make another adjustment. Is there a good solution for this? .


Machine adjustments,once set correctly, can't change. Hull length does, so you might have to sort them into two groups, long and short. The other variable that can affect your finished product is how far you pull the handle down. Make sure you full stroke the handle all the time. Lastly, with a single stage MEC "how" you pull the handle and operate the bar makes a difference. You pull the handle 6 times for each charge bar cycle, and the more jarring / vibration you cause the more settling of the components you get in the bar and therefore into the next hull.

The picture of your press is nice but we cant tell what the settings are from looking at it.
Pictures of your shells are far more helpful.

Steve

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 Post subject: Re: MEC 600 Jr quirks
PostPosted: Tue Jun 09, 2020 12:32 pm 
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Joined: Wed Jun 20, 2012 11:31 pm
Posts: 1353
It's all in the set up. First precrimp try for a 1/8 inch hole,if the die sticks on the hull back off a bit. Then set your cam for the right taper,this can take a little trial and error and is where you can buckle the hull. Lastly set your crimp punch for depth. I use 600 Jrs in 12,16 and 20 mostly 16 and haven't made a adjustment on the 16 in 6 or 7 thousand rounds at least. I'll leave components to others for advice.


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 Post subject: Re: MEC 600 Jr quirks
PostPosted: Tue Jun 09, 2020 3:59 pm 
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Location: S.E. Wisconsin
weeple2000 wrote:
7.5 shot - I dripped this myself. It's out of round as I'm still figuring out the whole process.


I think its great you are making your own shot, but I also believe when you are just starting out reloading you have to apply the KISS principal and eliminate as many problem causing things as possible. So, since your shot is out of round and could cause drop weight issues and therefore fill problems it might be helpful to buy a bag of new.

Steve

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 Post subject: Re: MEC 600 Jr quirks
PostPosted: Tue Jun 09, 2020 6:21 pm 
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Joined: Sun Apr 19, 2020 9:37 pm
Posts: 6
I was trying to show the version of the press. The precrimp is the style with the bolt and two nuts. I believe the older version used a metal spacer rather than two nuts. I know for a fact that my precrimp wanders. I can see it very easily as the size of the hole in the middle of the crimp gets larger. As for the crimp stage, it may be more difficult to tell. I think part of what dictates the setting for the cam and the crimp is the amount of precrimp. If the precrimp is set lower, then the overall shell will be crimped lower.

Do you have the same configuration for your precrimp if you can get that many rounds out without any changes to it?


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 Post subject: Re: MEC 600 Jr quirks
PostPosted: Tue Jun 09, 2020 6:43 pm 
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Location: S.E. Wisconsin
weeple2000 wrote:
I know for a fact that my precrimp wanders. I can see it very easily as the size of the hole in the middle of the crimp gets larger.


How can it wander? Whats moving? If it is adjusted and locked down tight what wanders?I have 4 of those pre-crimpers on my machines and they have never moved. Now, hull OAL changes and therefore the pre-crimp will look different, short hull less pre-crimp tall hull more pre-crimp but the die cant move on its own. Or you are not pulling the handle down full stroke all the time.

Steve

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 Post subject: Re: MEC 600 Jr quirks
PostPosted: Tue Jun 09, 2020 6:53 pm 
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Location: S.E. Wisconsin
weeple2000 wrote:
I picked up a Mec 600 Jr second hand.


From the picture you posted your 600 looks clean and looks fairly new. No paint wear on the base. But machines can be painted. Something that might cause your issues is broken/worn cross link pins. Have you checked them?

Steve

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 Post subject: Re: MEC 600 Jr quirks
PostPosted: Tue Jun 09, 2020 10:35 pm 
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Joined: Sun Apr 19, 2020 9:37 pm
Posts: 6
YevetS wrote:
weeple2000 wrote:
I picked up a Mec 600 Jr second hand.


From the picture you posted your 600 looks clean and looks fairly new. No paint wear on the base. But machines can be painted. Something that might cause your issues is broken/worn cross link pins. Have you checked them?

Steve


Are those parts 30, 33 and 34 in this diagram?

https://www.mecoutdoors.com/600-jr-mark-5-parts


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 Post subject: Re: MEC 600 Jr quirks
PostPosted: Tue Jun 09, 2020 11:09 pm 
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Joined: Sun Apr 19, 2020 9:37 pm
Posts: 6
The under side of the crimp station looks recessed. Like there is a washer missing. Is that supposed to be like that?

Image


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 Post subject: Re: MEC 600 Jr quirks
PostPosted: Wed Jun 10, 2020 12:35 am 
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Joined: Sun Apr 19, 2020 9:37 pm
Posts: 6
I just checked my pre-crimp again. I set it to the size of a primer, which is a bit smaller than a pencil. After running a few shells through the pre-crimp, it got looser. Is it possible that there isn't enough room in these AA HS hulls, causing the pre-crimp to back out?


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 Post subject: Re: MEC 600 Jr quirks
PostPosted: Wed Jun 10, 2020 1:23 am 
Tournament Grade

Joined: Tue May 03, 2011 1:25 pm
Posts: 215
If you were stuffing too much column height into the shell, usually either your crimp won't close or you will buckle the shell.

I'd unscrew that crimp starter and look at the threads. If it is moving around on you as you use it, worn threads could be a problem.


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 Post subject: Re: MEC 600 Jr quirks
PostPosted: Wed Jun 10, 2020 6:05 am 
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Location: S.E. Wisconsin
weeple2000
Part #30 is a spacer and does not wear. #33 are your 2 linkage arms and the holes in those can become an oval. Your cross link pins are part # 34,35 and 53 they can wear and I have seen a few break even on a handle machine. If needed the linkage arms you get from MEC, the cross pins ( bolts) a hardware store.

Steve

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I repair MEC presses. PM me.
Used to be Steve Y


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 Post subject: Re: MEC 600 Jr quirks
PostPosted: Wed Jun 10, 2020 6:13 am 
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Location: S.E. Wisconsin
The under side of the crimp station looks recessed. Like there is a washer missing. Is that supposed to be like that?

There is no washer missing and the surface should be flat.

Steve

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The More Times You Pull The Trigger The More Fun You Are Having.
I repair MEC presses. PM me.
Used to be Steve Y


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 Post subject: Re: MEC 600 Jr quirks
PostPosted: Wed Jun 10, 2020 6:16 am 
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There should be a nut on the shaft of the Main crimper center punch. That nut locks it into position in the turret. That nut should be up and locked against the bottom surface of the turret. Without the crimper locked in place in the turret, you have no way to establish proper crimping. This can also lead to destruction of the threads in the turret and on the center punch of the crimper.

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 Post subject: Re: MEC 600 Jr quirks
PostPosted: Wed Jun 10, 2020 7:19 am 
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Joined: Sat Feb 05, 2005 4:51 pm
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Location: Phoenixville PA
Post deleted.

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Last edited by BobK on Wed Jun 10, 2020 7:20 pm, edited 1 time in total.

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 Post subject: Re: MEC 600 Jr quirks
PostPosted: Wed Jun 10, 2020 9:24 am 
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Joined: Sat Nov 30, 2019 11:37 am
Posts: 3
Had similar problem with my 650. Found the linkage bolts at rear of machine worn. Replaced bolts still loading fine


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 Post subject: Re: MEC 600 Jr quirks
PostPosted: Wed Jun 10, 2020 12:26 pm 
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Joined: Fri Dec 27, 2019 7:22 pm
Posts: 97
Location: NE South Dakota
BobK wrote:
Curly is right. There is (or should be) a nut on top and a nut on the bottom of the threaded portion, where they meet the body of the press and both should be tightened after adjustment to assure they are locked in place.

The nut above and below are required to lock the setting, and if you don't have both of them, and tighten them securely, your adjustment will wander.


This.


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 Post subject: Re: MEC 600 Jr quirks
PostPosted: Wed Jun 10, 2020 12:49 pm 
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Location: S.E. Wisconsin
southdakbearfan wrote:
BobK wrote:
Curly is right. There is (or should be) a nut on top and a nut on the bottom of the threaded portion, where they meet the body of the press and both should be tightened after adjustment to assure they are locked in place.

The nut above and below are required to lock the setting, and if you don't have both of them, and tighten them securely, your adjustment will wander.


This.



The last picture the OP posted clearly shows a nut on the bottom of the die head. Without one on the top the pre-crimp post would fall out. Our only hope here is he left it loose.

Steve

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The More Times You Pull The Trigger The More Fun You Are Having.
I repair MEC presses. PM me.
Used to be Steve Y


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 Post subject: Re: MEC 600 Jr quirks
PostPosted: Wed Jun 10, 2020 2:50 pm 
Tournament Grade

Joined: Tue May 03, 2011 1:25 pm
Posts: 215
Looks like your press uses the plastic spindex crimp starter. Those do wear out at the ball/socket joint that holds the plastic die onto the stem, after years of use. A cheap replacement from MEC and several other places that carry MEC parts.

Like here:
https://www.ballisticproducts.com/MEC-S ... o/1308462/


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 Post subject: Re: MEC 600 Jr quirks
PostPosted: Wed Jun 10, 2020 3:39 pm 
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Location: Knoxville, Tn area Nyuck, Nyuck
Curly N wrote:
There should be a nut on the shaft of the Main crimper center punch. That nut locks it into position in the turret. That nut should be up and locked against the bottom surface of the turret. Without the crimper locked in place in the turret, you have no way to establish proper crimping. This nut not tight against the underside of the turret can also lead to destruction of the threads in the turret and those on the center punch of the crimper.


Notice that I have edited my post above to clarify it to improve understanding of the message,



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