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Posted: 7/4/2015 10:34:46 PM EDT
[#1]
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Posted: 7/5/2015 1:08:07 AM EDT
[#2]
Quote HistoryQuoted:
<a href="http://s250.photobucket.com/user/dryflash3/media/Case%20Gauge/P2100506_zps4ab43b86.jpg.html" target="_blank">http://i250.photobucket.com/albums/gg272/dryflash3/Case%20Gauge/P2100506_zps4ab43b86.jpg</a> Attach to a caliper and use the proper adaptor and measure fired cases from your chamber. Write this number down for future use. Set your sizing die to set the shoulder back .002 for a bolt action rifle. .003 to .004 for a semi auto. I don't know if the proper adapter is available. Does the Hornady kit have the adapter that will work for the 338 Lapua Improved? Just checked Hornady's website and there's no adapter for the 338 Lapua or Improved. ??? http://www.hornady.com/store/Lock-N-Load-Headspace-Kit-With-Body-1-Each/ |
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Posted: 7/6/2015 12:11:01 AM EDT
[#3]
Quote HistoryQuoted: I don't know if the proper adapter is available. Does the Hornady kit have the adapter that will work for the 338 Lapua Improved? Just checked Hornady's website and there's no adapter for the 338 Lapua or Improved. ??? http://www.hornady.com/store/Lock-N-Load-Headspace-Kit-With-Body-1-Each/ Quote HistoryQuoted: Quoted: <a href="http://s250.photobucket.com/user/dryflash3/media/Case%20Gauge/P2100506_zps4ab43b86.jpg.html" target="_blank">http://i250.photobucket.com/albums/gg272/dryflash3/Case%20Gauge/P2100506_zps4ab43b86.jpg</a> Attach to a caliper and use the proper adaptor and measure fired cases from your chamber. Write this number down for future use. Set your sizing die to set the shoulder back .002 for a bolt action rifle. .003 to .004 for a semi auto. I don't know if the proper adapter is available. Does the Hornady kit have the adapter that will work for the 338 Lapua Improved? Just checked Hornady's website and there's no adapter for the 338 Lapua or Improved. ??? http://www.hornady.com/store/Lock-N-Load-Headspace-Kit-With-Body-1-Each/ You will have to measure a case, then find a similar cartridge with the same dimensions and see if it's listed. The joy of wildcats.  |
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Posted: 7/6/2015 6:03:18 AM EDT
[#4]
You can get a custom collet made as well. Never heard of anyone actually doing it, but Hornady lists the 'F' collet as a blank which can be machined for whatever datum line you want.
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Posted: 7/6/2015 9:27:34 PM EDT
[#5]
I have some 480 Ruger brass that I could use to establish a datem line. According to my reamer print, the shoulder is .57 and the neck is .372. I could use any point in between to use as a point of reference. Right? Slide the 480 Ruger brass over the Lapua AI shoulder case where it should make contact between those 2 points. The trick would be keeping it square to get an accurate measurement.
Would that work? |
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Posted: 7/7/2015 3:58:40 AM EDT
[#6]
Heres what you need, it doesn't use a datum line but rather the shoulder angle to measure off....should be perfect for what you need...
sinclair 338 Lm bump bushing |
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Posted: 7/7/2015 11:34:10 AM EDT
[#7]
Quote HistoryQuoted:
Heres what you need, it doesn't use a datum line but rather the shoulder angle to measure off....should be perfect for what you need... sinclair 338 Lm bump bushing My Lapua Improved uses a 40 degree shoulder angle. The regular Lapua uses a 20 degree angle. |
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Posted: 7/8/2015 12:04:45 AM EDT
[#8]
I looked at the largest adaptor in my Hornady headspace comparator kit and it is a .420, confirmed the inside measurement with a caliper.
If your case diameter is larger, this won't work without some machining. |
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Posted: 7/8/2015 8:32:58 AM EDT
[#9]
Giraud makes a gauge for the regular 338 round. Maybe he will make you one?
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Posted: 7/8/2015 9:17:13 AM EDT
[#10]
What is important is the diameter used as the datum. Do you know that number for your 338LMI cartridge? If there's a SAAMI spec for this cartridge, you can get the number from their spec sheets.
How about asking the barrel maker (the one who did the chambering)? Heck, the maker of the chamber reamer would know, too. If you are only concerned with the amount the should gets set back during sizing, you don't need any particular gage size, just something close - anything that is large enough to fit over the case neck and avoids the radius at the neck-shoulder junction. |
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