question regarding .40 and 10mm

HeavyT

HeavyT

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Hey All,

hoping for some guidance. Recently I stared reloading among other things .40 cal, and I have figured it out, successfully loaded a few hundred rounds.
SO onto my question. I was given 1000 180 gr fully jacketed proejctiles. Upon inspection I realize they are the exact same dia. as the .40 cal hard cast lead bullets I use of the same weight, but the 10mm bullets are what looks to be a couple mm longer, (slightly different shape)
Is it safe to sub 10mm projectiles for .40 cal projectiles without altering the powder charge? it occurred to me that the added length would go into the case and in my brain that tells me there is a high probability of pressure intensification on detonation that would be greater than what is listed in the "normal" .40 cal ballistics data.
Anyone have any experience on this?

Thanks, Tom
 
Fourty and 10mm projectiles are the same. Just look up the load data for that weight , type of bullet (fmj, lead etc..)
 
being cautious when reloading is never wrong, but in this case the 40 and 10mm work behind the same idea that a 38 special and a 357 magnum do

just look up the OAL in your load data an you'll be fine, even if you go a hair or two deeper chances are you'll still be fine
 
.40 and 10mm bullets are the same, there isn't a differnet box or part number for one or the other. All you've ran into is bullets of the same type/weight but from different manufacturers. Being that they are from different manufacturers they could have different bearing surfaces, jacket thickness, and hardness so you should work up loads for each then you can choose a load that is safe for both and mix them
up if you wish. I personally have multiple brands and configurations of 180gr tmj mixed in one box. I've got a load that's safe with all, I pay no attention to which one
I'm about to press.
 
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