Bullet Bands

5shooter
Posts: 19
Joined: Tue Dec 02, 2008 1:24 pm

Bullet Bands

Postby 5shooter » Tue Jan 24, 2012 8:18 pm

I have a 200 grain .360 mold you made that works great! It has a .35 long nose with 80% meplat and 3 bands below the crimp plus the gas check. I also have a 235 grain .377 mold you made that also works great! The .377 has a .375 long nose with 80% meplat and 2 bands below the crimp plus the gas check. The .377 mold is longer below the crimp groove than the .360. I just ordered another .377 mold and was hoping to get the 3rd driving band, but was unsucessful. My question is why does the program allow more driving bands below the crimp groove with the .36 bullet than the .375?

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mtngun
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Posts: 1632
Joined: Fri Feb 01, 2008 5:45 pm
Location: Where the Salmon joins the Snake

Re: Bullet Bands

Postby mtngun » Tue Jan 24, 2012 8:35 pm

There is an arbitrary minimum band length for each caliber. Small bands are more difficult to fill out and more prone to heat shrink as caliber increases and as groove depth increases. I.E., 0.050" long bands on a heavy 50 caliber will not cast well with wheelweight.

I'm thinking about offering a shallower groove depth that would allow smaller bands. If I can ever find time to do it.


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