Modern Sporting Rifle Evolution
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BIGGDAWG

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Reply with quote  #1 

I thought i would do a post on making mongoose brass. I stumbled on something when making brass for the ocelot. 
when i was forming mongoose and the first ocelot i always had a little bulge at the shoulder now it dont hurt anything and it is because the case actually blows out there so it is unsupported in the die when forming.

well i wanted to set up to make brass in bulk so i had a couple 223 trim dies for my dillon rt1200. i took one of the dies and modified the neck area to work to trim mongoose. First i took and found an end mill i had laying around it was a 1/2 inch end mill that had the cutting teeth on the sides of course but also on the flat bottom. It fit perfectly in the top of the die so as you can see in the first pic i counter bored the die down about .120 then i opened the neck up to .265 or so that way all the die is doing is trimming this is important because i set my tool head up on the 650 with the mongoose die in station 1 with expander so it runs through the die sets shoulder and expands. then in 4 i have the trimmer. i hold the die a little off the shell holder because i don't want to mess with the new shoulder just formed. and i set to trim to 1.693 that way when fire formed them come in pretty close to 1.69.

by running through the 223 trim die held up it pushes that unsightly bulge back in and the brass comes out looking almost perfect. now if doing mongoose you are done just chamfer and debur you are good to go if making ocelot put a sinclair expander in with the t25 expander in station 5 and now you have ocelot brass. hope this helps.

21845778_1722586334450731_1770699060_o.jpg  21886607_1722586464450718_866189007_o.jpg  trim die mod.jpg 
20170726_214852.jpg  20170726_214858.jpg  20170726_214906.jpg  20170726_221625.jpg  20170726_221635.jpg  20170726_221639.jpg  20170726_221645.jpg 



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MDWS

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Reply with quote  #2 
Wahoo!!!!
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BIGGDAWG

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Reply with quote  #3 
here is the carbide end  mill i used

20170918_130032.jpg  20170918_130029.jpg 


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RangerJoe

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Reply with quote  #4 
Nice work Bruce!!  Looks like a step towards bulk Mongoose brass!!
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BIGGDAWG

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Reply with quote  #5 
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Originally Posted by RangerJoe
Nice work Bruce!!  Looks like a step towards bulk Mongoose brass!!


Don't forget the big brother the Ocelot lol

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RangerJoe

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Reply with quote  #6 
Yup - that too.  [wink] That's one cat I don't have at the ranch (yet).
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wikster1983

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Reply with quote  #7 
Quote:
Originally Posted by RangerJoe
Yup - that too.  [wink] That's one cat I don't have at the ranch (yet).
Ocelot plays well with Wlvs, Sabercats, Mongoose, and Yetis. RJ you ought to really have an Ocelot too, lol !

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RangerJoe

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YOU ENABLER !!  Like I need any encouragement ... LOL. 
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wikster1983

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Reply with quote  #9 
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YOU ENABLER !!  Like I need any encouragement ... LOL. 

What are you singling me out for?! This is a whole group of enablers! I dont see it as encouragement, its more like a support group! ROFLMAO!

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Dogtired

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Reply with quote  #10 
Nice set up! One step closer to making the Mongoose more appealing to the masses!
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