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Finding the lands

johara1 said:
Alex, i still prefer seeing the land marks disappear for finding zero, but feel is good also….. jim
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Jim, I used to do it that way. At least for me it was difficult to repeat. I'd polish the bullet and use a magnifier glass, but those marks can hard to see for me. You get the same number with both methods.
 
zfastmalibu said:
Jim, I used to do it that way. At least for me it was difficult to repeat. I'd polish the bullet and use a magnifier glass, but those marks can hard to see for me. You get the same number with both methods.
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Alex, I just used your method to find the lands in a brand new .22 BR. What an eye-opener. Using the split neck method I was getting multiple #'s. Your method is absolutely repeatable with the same result each time. Thanks for a great tip. dedogs
 
tom said:
When I first started this I had been looking for marks. It was the common way most long range guys did it. The marks disappear at the same point as the hitch disappears. I asked Alex to do this video because this really works, and it will help people. This is more repeatable, and takes some doubt out of it, you either feel it or don't. I trust it enough to go ahead and follow my erosion around.

Tom
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Tom, How often do you check? After each match or....?
 
zfastmalibu said:
Pretty common question, so I did a quick video. Hope it helps.
http://www.wheeleraccuracy.com/#!information/p62ad
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You did a great job with that video. Thank you.

A little feedback for you..... I have used two BAT MB receivers for years. One action has an ejector and the other does not. The bolt with the ejector has the minimum amount of coils to just get the case to clear the action. I have always used both "feel" and "seeing the marks" to track just touch on both rifles.

With good bullets, both actions are very consistent. IOW, when the handle would drop just right(for me), the bullets would show the VERY tiny marks that I expected. Usually the difference of 1 or 2 thou. would be enough to allow the bolt to fall very freely, have no bolt raise click, and the bullets would show no marks.

Anyway, the bolt with the ejector would always show 4 to 5 thou. difference in just touch depending on whether I checked it with the ejector installed or removed. It always surprised me that the tiny amount of force from that shortened ejector spring would make that much difference in the bolt feel and the OAL. Full disclosure is that I got lazy and leave the ejector installed.

Just glad to see that I wasn't imagining all this.

Jack
 
After watching the video I applied that method to check "jump 0" of my Berger 200 hybrid cartridge whose OAL measured with the Hornady dummy case.

Bolt method: OAL 3.080"
Hornady : OAL 3.130"

Is it possible such huge 0.050" difference?
 
Excellent video and worked exactly like you described when I tried it last night. Using my Hornady tool I ended up with a range of numbers about .003 apart with 6 measurements. The average of that ended up being about .002 different (deeper) then your method.

I'm not sure why finding exact zero is so important though. It is just a reference point, and you will either go in or out from that reference point when doing seating depth tests. Am I missing or not understanding something?
 
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Otter said:
Excellent video and worked exactly like you described when I tried it last night. Using my Hornady I ended up with a range of numbers about .003 apart with 6 measurements. The average of that ended up being about .002 different (deeper) then your method.

I'm not sure why finding exact zero is so important though. It is just a reference point, and you will either go in or out from that reference point when doing seating depth tests. Am I missing or not understanding something?
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Finding zero may not be important. I do it because its consistent and you can share numbers that actually mean something to someone else who uses the same method. Two guys using the hornady tool will come up with different numbers, and unless you made a case that headspaces perfect in your chamber to use with your hornady tool the numbers wont be accurate.

I make no claim to this being "my" method, many others have been doing it this way for a long time. I just made the video. :)
 
Understood. Just wondering if I was missing something since you were going to a .0005 measurement. BTW - liked the other video too. Pretty slick drop port Panda.
 
Otter said:
Understood. Just wondering if I was missing something since you were going to a .0005 measurement. BTW - liked the other video too. Pretty slick drop port Panda.
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What we have seen at 1k in perfect conditions it that .001" will make an impact on group size/shape. So it is very important to be able to find an exact repeatable number, no matter where it is so long as you can repeat it perfectly. So far this is the only method I can repeat that well with.
 
This is a excellent post Zfast. You helped several people I'm sure. These old school ways need to be passed on and you explained it well. I will try your method on my next barrel and compare it to mine. Thank you for the great post!
 
Quote....at 1k in perfect conditions it that .001" will make an impact on group size/shape.

WOW.... I had no idea that tolerance was that close at 1000yds... WOW.

GREAT VIDEO.
 
Good video and explanation!

The real secret stuff is, how you manage to change the seating depth for the bullets in such small increments so quickly :)
 
For me this has been the most repeatable method also. The only thing I would add to this technique would be I always perform task after cleaning throat and barrel as a fowled barrel will most always give me a slightly deeper oal to touch point. So considering duplication I always verify after said cleaning.
 
thanks for the video . I am new to f/tr shooting . I was told when I got this gun I will be shooting that I should seat the bullet .015 thou off the lands . so if I read this right . I use your method and seat the bullet.015 thou deeper in the case . I am right on this assumption . thanks rich
 
crash said:
thanks for the video . I am new to f/tr shooting . I was told when I got this gun I will be shooting that I should seat the bullet .015 thou off the lands . so if I read this right . I use your method and seat the bullet.015 thou deeper in the case . I am right on this assumption . thanks rich
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Yes
 
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