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  #1  
Old 06-25-2019, 01:59 PM
mr.tickle mr.tickle is offline
 
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Default Hornady 155gr COL?

Good Afternoon,

Working on loading some 30-06 with IMR 4895 for my M1. I am using some Hornady 155gr HPBT match w/ cannelure. I just realized that cartridge isnt in my Hornday reloading data. What would be a good COL for this? Or more so a safe one?
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Old 06-25-2019, 03:06 PM
rcolarco rcolarco is offline
 
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3.210

New book has it.
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  #3  
Old 06-25-2019, 03:14 PM
Unclenick Unclenick is offline
 
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Normally, you would put the cannelure about 2/3 of the way into the case mouth with the case at the standard trim-to length of 2.484". If you plan to crimp, there's no other way. If you don't plan to crimp, you would have done better to get the same bullet without a crimp cannelure, as cannelured bullets are generally a bit less accurate due to the distortion from rolling the cannelure in. It displaces the bullet's center of gravity slightly. You should end up with the same 3.210" length the uncannelured version of the bullet is listed by Hornady as having been used as their tested COL.

BTW, you can certainly establish a different COL for your gun if it turns out to shoot better. Just be aware that when you go too deeply into the case, peak pressure starts to climb and when you get too close to the throat (under around 0.030" for a standard tangent ogive bullet) it also starts to climb, reaching about 20% extra height when you seat out all the way to contact with the throat. So you want to work the load back up at too near either extreme to avoid extra pressure.
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Last edited by Unclenick; 06-25-2019 at 03:16 PM.
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Old 06-26-2019, 06:01 AM
rcolarco rcolarco is offline
 
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You don't have much freedom in COAL with this bullet. The long ogive and the boattail combine to give a very short cylindrical section Seat the bullet out too far, and you will have inadequate case grip and ammunition that disassembles itself during the feeding cycle.

Just use 3.210
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  #5  
Old 06-26-2019, 10:42 AM
Unclenick Unclenick is offline
 
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Same problem with the second generation Palma bullet from Sierra.
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