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Old 09-02-2018, 05:52 PM   #1
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COL Questions

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I'm working up some loads for my Micro 9 s.s. I'm using W 231 powder, CCI #500 primers, Winchester cases and Xtreme copper plated 115 gr. RN bullets. I did a plunk test with a dummy round and found that I could spin the bullet at a max of 1.196" COL. I couldn't find a load setup for plated bullets but the Hodgdon data said that for 115 gr. lead RN I should use 4.3 to 4.8 gr of W231. However, it also said to use a COL of 1.100". I understand that it's ok to use the data for lead bullets for copper plated bullets. I have shot Armscor factory 115 gr. bullets with a COL of 1.147" with no problems.

I'm not sure what I should make the COL as I have read in other forums that it's o.k. to make it .010" or so shorter than the Plunk test value. I guess I don't understand the ramifications of varying the COL and how to figure what it should be. The only thing I'm worried about is the possibility of blowing up the gun. Overstressed cases and FTE's I can handle and modify the load accordingly. I would appreciate it if some of you more knowledgeable members could educate me on the subject of COL. Thank you.

Tommy b
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Old 09-02-2018, 09:34 PM   #2
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1.100 is the standard for 115 grain. I load a 125 grain with 4.2 grains and a 1.140 COL.
As long as they don't hit the lands in the chamber the length is fine.
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Old 09-03-2018, 10:38 AM   #3
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Thanks for the quick response. I was under the impression that the proper COL depended on the burning speed of different powders. What is the relationship of COL and chamber pressure with faster and slower burning powders? In other words, can I use 1.100" for all powders with any 115 gr. bullet configuration?

I have been loading since 1959 and this year is the first I have heard about varying COL. Naturally, I'm a bit confused and I'd like to learn more about the subject. I will contact a reloading forum but the people on this forum have been so friendly and helpful that I thought I'd start here first. Thanks to anyone for their input.

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Old 09-03-2018, 02:18 PM   #4
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My Lee book runs from 1.090 to 1.145 depending on bullet grain and powder. Pressures vary from powder to powder depending on burn rate. As long as your using a mid load data load you really shouldn't have to worry too much on the exact COL for that load. As long as its not under or over the COL range.
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