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How accurate should COL be?

 
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  #8  
Old 10-13-2011, 04:18 PM
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Re: How accurate should COL be?

One thing that I question is the Hornady dies have rubber washers on the adjustment screws, and that seems to me it should introduce some sloppiness in the system. But then anyone with a Hornady die would have the same problem I would think.
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  #9  
Old 10-13-2011, 04:42 PM
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Re: How accurate should COL be?

I get the same problem with Barnes and it absolutly drives me nuts. I figured it was a bullet issue. It did make me more consistant with pressure through the stroke of the press and at the end of the stroke.
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  #10  
Old 10-13-2011, 04:46 PM
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Re: How accurate should COL be?

Glad I'm not the only one.


For the other question there... how much does it matter? Which parts of the process are important to get the most consistent for results down range? (As opposed to warm fuzzy feelings. Don't get me wrong, I love warm fuzzies too)
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  #11  
Old 10-13-2011, 06:48 PM
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Re: How accurate should COL be?

How much does it matter?
VERY much if you care to get the best of your gun's accuracy potential.
Seating depth is the single biggest performance adjustment.

If your load shoots best with bullets off the lands, you need to hold that distance within +/- 1thou.
Luckily, this is not difficult once the bugs are worked out.
You need to isolate the issue.
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  #12  
Old 10-13-2011, 06:51 PM
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Re: How accurate should COL be?

I've been trying to just keep a consistent OAL which obviously hasn't been working.

Maybe I'll try to make getting that press properly mounted a project for the weekend.

I haven't delved into loading off the lands yet since I'm still pretty new to reloading. Have only done a few hundred rounds. As I get more experienced that might be next

ETA: I also read recently that primer pocket uniforming is another big variable in keeping rounds consistent. That really surprised me since I thought the primer wouldn't have much affect on paper. Any opinion on that matter?

Last edited by siegrisj; 10-13-2011 at 06:52 PM. Reason: ETA
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  #13  
Old 10-13-2011, 08:31 PM
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Re: How accurate should COL be?

I've found that there's usually a window of seating from 15 to 20 thou wide that really doesn't make much difference in accuracy, at least not out to 300 yards or so. I find the full range of tolerance and seat in the middle of it, then the normal variations won't mean a thing.
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  #14  
Old 10-15-2011, 03:43 PM
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Re: How accurate should COL be?

So I just measured a box of Federal GMM 168gr using the same comperator. Here were the numbers

* 2.222 2.223 2.224 2.225 2.225 2.225 2.225 2.226 2.226 2.226 2.228 2.228 2.228 2.228 2.228 2.230 2.230 2.230 2.231 2.232
Looks like their range of tolerance isn't too far off from what I am getting. Even though I still want mine to be tighter. (Who doesn't? )
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