NBC bullet 180gr. TC, weighs 170, what load? - Shooting Sports Forum


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Old 10-06-2019, 19:46   #1
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NBC bullet 180gr. TC, weighs 170, what load?

Uncovered a stash of NBC cast bullets from years ago. They are labeled .358" 180gr. TC but weigh 170. gr. Would a high alloy mix account for 10 gr. of weight? Do I load for 180gr. or 170gr.? Weight or surface area? Planning on using 13 gr. of 2400. Sound right?
Thanks in advance, dgang
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Old 10-07-2019, 05:19   #2
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A high percentage of tin or antimony would account for the loss in weight- they are both less dense than lead. I would use the 180 grn. data, as pressures should be lower. However, the harder the bullet, the more difficult it is to obturate. Leading may be an issue.
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Old 10-08-2019, 08:43   #3
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Originally Posted by dgang View Post
Uncovered a stash of NBC cast bullets from years ago. They are labeled .358" 180gr. TC but weigh 170. gr. Would a high alloy mix account for 10 gr. of weight? Do I load for 180gr. or 170gr.? Weight or surface area? Planning on using 13 gr. of 2400. Sound right?
Thanks in advance, dgang
No not off hand it does not sound right. What is the firearm you are loading for? Just looking at the Alliant web site 2400 is a magnum or +P load for .38 special. Shooting lead at those pressures can cause issues. Did you mic some diameters to get a feel if they were sized or not and lubed?
https://www.alliantpowder.com/reload...9&cartridge=28
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Old 10-08-2019, 14:49   #4
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Originally Posted by chill1955 View Post
No not off hand it does not sound right. What is the firearm you are loading for? Just looking at the Alliant web site 2400 is a magnum or +P load for .38 special. Shooting lead at those pressures can cause issues. Did you mic some diameters to get a feel if they were sized or not and lubed?
https://www.alliantpowder.com/reload...9&cartridge=28
Using a GP100. .358" in size and they are lubed. Alliant current site is about useless, they only give data for Speer and a very few standard bullet. They give 14.5gr. of #2400 for a 180gr. FMJ. I think 13gr. of 2400 would be under pressure for a hard cast bullet.
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