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How do you determine "at the lands" by your method?

 
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Old 05-21-2004, 11:41 PM
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Re: How do you determine "at the lands" by your method?

Michael

I've read of that "close the bolt" method but I have a question. When the bolt is cocked the firing pin protrudes forward. When you start a round forward into the chamber it is really the pin pushing the cartridge case forward and not the bolt face. Does the firing pin fully recede as the bolt is finally closed and before the bullet hits the lands?

If not, isn't there more space (length) once the bolt is fully closed and now the bullet no longer makes contact with the lands?

[ 05-21-2004: Message edited by: Len Backus ]
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Old 05-22-2004, 06:11 AM
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Re: How do you determine "at the lands" by your method?

db

Duh...braindead me! I meant the ejector pin which is part of the "firing pin" assembly which should be removed from the bolt first if you want to get the most accurate reading. At least that's what I read on Benchrest Central. Haven't tried it myself. Wondering if anyone elase here has.
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Old 05-22-2004, 09:21 AM
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Re: How do you determine "at the lands" by your method?

Len,

Yes, I have done that, to fireform brass in my 244 AK, remove it all together.

db
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Old 05-22-2004, 09:22 AM
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Re: How do you determine "at the lands" by your method?

Hello Len

Your question is one that concerned me in the past. I think I get a litle crazy with reloading detail at times but there is no substitute for consistent accuracy. I use a Stoney Point gauge, as for the shells I use ones that were fired in my chamber and thread them 5/16 36 tap. This way I know that bolt face to shoulder is snug and OAL is consistent. If you only neck size and dont bump the shoulder everything stays consistent. I guess if you use a case from your chamber the ejector wont be able to push it forward if your on the shoulder?
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Old 05-22-2004, 11:38 PM
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Re: How do you determine "at the lands" by your method?

Rimfire

Excellent observation! Yes, I bump the shoulder only about .002 so you are right, the ejector position would be a non-issue.
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Old 05-23-2004, 02:34 PM
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Re: How do you determine "at the lands" by your method?

Len,

I had the smith that built my rifle replace the factory ejector spring with a spring that is light enough to depress with your finger. It is just barely enough to throw the case. The benefit is less trouble for precision reloading and it allows easier extraction due to the super tight BR chamber I have due to less preassure on the side of the case in the chamber. I generaly dont take into consideration the firing pin. I also use fire formed cases which help a bit.

[ 05-23-2004: Message edited by: meichele ]
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Old 05-23-2004, 06:14 PM
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Re: How do you determine "at the lands" by your method?

Michael, that's an interesting idea!
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