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WW vs WW + 2% Tin - Mountain Molds

WW vs WW + 2% Tin

5shot
Posts: 7
Joined: Thu Oct 18, 2012 4:23 pm

WW vs WW + 2% Tin

Postby 5shot » Thu Oct 18, 2012 4:41 pm

How will the final diameter change between the two? I am looking to design a bullet for the 35 Whelen. I usually add Tin to my WW, and I was curious.

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mtngun
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Re: WW vs WW + 2% Tin

Postby mtngun » Fri Oct 19, 2012 8:41 am

There is no predictable diameter change for a given alloy. Depends on the bullet design, the block, the casting technique, etc.. WW&tin may cast smaller in one mold and larger in another mold. Or it may cast larger at one temperature and smaller at another temperature. Or it may cast larger on the front band and smaller on the bottom band. Many variables.

5shot
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Joined: Thu Oct 18, 2012 4:23 pm

Re: WW vs WW + 2% Tin

Postby 5shot » Fri Oct 19, 2012 1:31 pm

Thanks. I will order my mold for WW + 2% Tin, as that is what I typically use.

5shot
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Joined: Thu Oct 18, 2012 4:23 pm

Re: WW vs WW + 2% Tin

Postby 5shot » Thu Oct 25, 2012 4:54 am

I have a follow up to this:

Which mold has a larger machined diameter - the WW or the WW + 2%?

The reason I ask, is if the the WW + 2% is smaller, and I lose some tin from the mix, I might end up with bullets too small for the bore (or I need to order the mold larger).

Thanks.

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mtngun
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Re: WW vs WW + 2% Tin

Postby mtngun » Thu Oct 25, 2012 9:55 am

All my molds are cut by trial and error. I have no formula for predicting the machined diameter.

As long as your bullet drops out 0.002" oversize, you have wiggle room to allow for variations in alloy and casting technique. Unless you are talking about a bore riding nose, in which case, you just stumbled onto one of many issues with the bore riding design. ;)

5shot
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Joined: Thu Oct 18, 2012 4:23 pm

Re: WW vs WW + 2% Tin

Postby 5shot » Fri Oct 26, 2012 2:54 pm


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mtngun
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Re: WW vs WW + 2% Tin

Postby mtngun » Sat Oct 27, 2012 11:52 am



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