New mihec mold frustrations!

[hc18flyer]

New 45 colt mold, can't get rid of wrinkles! Casting for several years, tried different temps and cadences. Maybe got some sprue plate lubes in the cavities? Will scrub out after lunch and try again? Hp's are fine, releasing from mold fine, just wrinkles. Using a 25 to 1 alloy for soft hunting boolets.

[BHill]

I’ve had similar issues with his molds as well. Added a little more heat and wrinkles went away after about 40-50 cycles. Never to reappear. Must be the oil he uses in the machining process.

[clintsfolly]

Boil it in water with Just a drop or two of Dawn.use a old pan as the crud is impossible to scab off.

[tomme boy]

Get it hot and spray with brake cleaner. Do this a couple times and it will go away

[Burnt Fingers]

Wash with hot water and Dawn.

Heat cycle, I use an oven, three times. I set oven to 400, let mold bake for 30 minutes, then turn oven off and let mold cool in oven. If needed I'll lightly smoke cavities with butane lighter.

Brass likes to be run HOT.

[hc18flyer]

It was better this afternoon, but still had wrinkles. I 'heat cycled' it 3 times on Saturday. I was running the alloy between 760 and 800 degrees. I sorted out the best 75 boolets for load development and hunting. I will boil it with Dawn and heat cycle it again. I didn't have similar issues with my first MiHec mold? hc18flyer

[Beagle333]

Speed up your cadence. Preheat mold to about 425 with hotplate if you have one. But cast fast. Don't stop to put sprues back, don't stop to cull or admire boolits, just cast, cast, cast. I usually cast fast until they start coming out a little frosty. Then you can slow down your cadence a bit and mess with sprues and culls a bit while you wait on sprue puddle to harden.

[OS OK]

If they look anything like this...then you don't have enough heat in the mould and prolly could use a little more in the pot too...

https://i.imgur.com/nyiWyzJ.jpg

I was trying to cast with this ole-hunk-O-Aluminum...ran the mould up to 325ºƒ and was in a hurry and called the preheat good...I was also at 725ºƒ in the pot.
Even with aluminum, if the cavities are small comparred to the mould blocks then that mould needs heat...at least 400ºƒ worth of heat.

https://i.imgur.com/B9C7adY.jpg

I settled down, got out of my hurry and put the mould back in the mould oven and waited for it to get to 400ºƒ...I put all these poser-casts back in the pot, stirred and fluxed again with wax & I turned the pot up to 750ºƒ.
When the planets aligned and the temperatures were right...this is what I got in the next 5 mould pours.

https://i.imgur.com/0cUTAuq.jpg

[Tom_in_AZ]

Get it hot and spray with brake cleaner. Do this a couple times and it will go away

This has been my experience also.


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[MOA]

I had some wrinkles on my new MP md too, but some fast casting at 750 and after 25 boolits they went away. My first brass mold. They came out great. Very happy. I did scrub the you know what out of it with dawn and lots of hot water several times before I started using it so that likely helped a lot.


https://i.postimg.cc/SNzB2fFW/20190922_102438.jpg (https://postimg.cc/gnmS1R0J)

https://i.postimg.cc/XJLCgCRL/20190922_114916.jpg (https://postimg.cc/r0dsVKFR)

[dondiego]

What caliber and use are the above pointed boolits?

[MOA]

What caliber and use are the above pointed boolits?

This is a fifty caliber. Standard use is for the S&W 500.

I use this in my Swede rolling block. It's basically a 50-70 Govt.

I use it for hunting feral hogs currently.