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bullet finning of cast bullet. (Read 1869 times)

GWarden Senior Forum Member Offline Posts: 317 Location: Marshalltown Iowa Joined: Apr 18^th, 2004	bullet finning of cast bullet. Aug 5^th, 2020 at 2:32pm	Print Post
	Bullet finning with cast bullets from a new mold, is this from running my temps to hot? Have checked ever thing else, it closes up tight like a vault. Never had this before in any of my molds. Thanks in advance for your advice. bob

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JLouis Frequent Elocutionist Offline Posts: 10625 Joined: Apr 8^th, 2009	Re: bullet finning of cast bullet. Reply #1 - Aug 5^th, 2020 at 2:52pm	Print Post
	Who's mold the vent lines all though not needed are probably abit to deep. Might try lowering your casting temp. but the consistency of the weights and the quality of the bullets might also suffer. Is it steel, aluminum or brass. Did you buy it from the maker or a distributor you might end up having to send it back after talking to either one. I cast at 820 and if I go down to 750 the quality of the bullets really suffers and to the point of not being able to be used for compeitive use.
	« Last Edit: Aug 5^th, 2020 at 2:59pm by JLouis »
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Jeff Houck Junior Member Offline Posts: 78 Location: Pocatello Joined: Jan 11^th, 2014	Re: bullet finning of cast bullet. Reply #2 - Aug 5^th, 2020 at 3:03pm	Print Post
	It's a combination of high temperature and pouring pressure. If you are ladle casting then you cannot change your pouring pressure, so lower the temperature of your metal. If you are bottom pouring keep your temperature and try varing the pouring pressure. Do this by slowing down the stream to a more moderate speed or less. Also play with how far you are dropping the stream of metal into the mold. You can also splash the stream against the edge of the sprue hole to break the force into the mold. You didn't say where you were getting the fining. I'm assuming it's the vent lines. If it's the sprue plate make sure it snug to the mold if you're bottom pouring. If you're laddle pouring then apply pressure with the laddle to hold the plate against the mold. Let me know if this works for you. If not, let me know and I'll send you my phone number and we'll brain storm some thoughts.

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GWarden Senior Forum Member Offline Posts: 317 Location: Marshalltown Iowa Joined: Apr 18^th, 2004	Re: bullet finning of cast bullet. Reply #3 - Aug 5^th, 2020 at 9:13pm	Print Post
	John& Jeff Thanks for your replies. The vent lines do look a bit deeper than on other molds. It is a steel mold. This mold produces that most accurate bullets of any that I shoot in two CPA's in 32/40. You mention ladle pressure, I do have a smaller ladle that I can try, will see what that does next time. Lowering the temp seems to reduce the amount of finning that takes place.

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Cbashooter Frequent Elocutionist Offline Posts: 1570 Location: Eastern Wa. Joined: Mar 31^st, 2018	Re: bullet finning of cast bullet. Reply #4 - Aug 5^th, 2020 at 11:53pm	Print Post
	I have a mold that does the same thing,an old ventless ideal 308403. I pour with a ladle. I use no Ladle to sprue plate contact .I just pour it into the cone slowly and let it puddle up. Bottom pouring does not produce very good bullet with this mold.


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oneatatime Frequent Elocutionist Offline Posts: 3865 Location: Rocky Mountains Joined: Oct 30^th, 2011	Re: bullet finning of cast bullet. Reply #5 - Aug 6^th, 2020 at 12:36am	Print Post
	A friend of mine who is an experienced caster told me that if he runs into a mold like that he fills the vent lines some with a soft lead pencil.


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GWarden Senior Forum Member Offline Posts: 317 Location: Marshalltown Iowa Joined: Apr 18^th, 2004	Re: bullet finning of cast bullet. Reply #6 - Aug 6^th, 2020 at 8:44am	Print Post
	Will give the soft pencil lead a try. bob

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GWarden Senior Forum Member Offline Posts: 317 Location: Marshalltown Iowa Joined: Apr 18^th, 2004	Re: bullet finning of cast bullet. Reply #7 - Aug 6^th, 2020 at 4:38pm	Print Post
	Cast a group of bullets today, was able to eliminate the finning 95% of the time. What I ended up with is totally contrary to what we are taught and experience in casting. I used a smaller ladle and that lowered the pressure in the mold. I tried that at 800 degree, continual finning. Starting lowering the temp and was not able to almost eliminate the finning until I hit 650 degree. At that temp should not have had good bullets. At that temp the base is good and sharp, grease grooves were not rounded off. Weighed them and had very consistent weight for the pour. Next, the shooting well tell the answer if they are still great shooters. bob

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beltfed Frequent Elocutionist Offline Posts: 1752 Location: Central Wi Joined: Dec 20^th, 2007	Re: bullet finning of cast bullet. Reply #8 - Aug 6^th, 2020 at 9:58pm	Print Post
	GWarden, Just curious, what alloy are you using? beltfed/arnie


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GWarden Senior Forum Member Offline Posts: 317 Location: Marshalltown Iowa Joined: Apr 18^th, 2004	Re: bullet finning of cast bullet. Reply #9 - Aug 7^th, 2020 at 9:14am	Print Post
	Using 25:1 mix bob

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JLouis Frequent Elocutionist Offline Posts: 10625 Joined: Apr 8^th, 2009	Re: bullet finning of cast bullet. Reply #10 - Aug 7^th, 2020 at 2:11pm	Print Post
	Might want to check your lead thermometer GW the melting point for lead is 621 and you might be higher than you think.

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