I wonder if a shallow cup shape that is the right size for different case heads would work in place of that anvil. Might eliminate some of the spinning the cartridge to square it up. But then I'm not measuring every cartridge coming off the press, first 3 or 4 and they are consistent then one periodically maybe every 20 as spot checks.
I have been thinking about a better way also. I talked to the folks at 21st Century reloading and we discussed an anvil that is essentially a case holder also. That may eliminate all wobble and make the measurement as exact as possible.
I have been using the .22 cal insert to measure the .308 bullet seating depth. I don't understand if all we are doing is to find max COAL so I can set the die to seat .020 less, why would it matter where on the bullet we are taking measurements from as long as it's not the tip? It's a relative measurement anyway, so why must it be taken at the Ogive and not somewhere above it. Can you explain? Thanks.
If you are really trying to seat the bullet so it is just off the lands, using the correct insert is important. Each insert is designed to impact the bullet at the ogive. That point on the ogive is the same point that will first impact the lands of the rifling. Alternatively, if you want to get a good measurement of cartridge length, the approach you are using will work just fine. Just be sure you are always measuring using the same insert. I hope this helps.
I do not bother with a fired case to ensure that I am getting an accurate ogive dimension. The shoulder is the datum and not the base of the cartridge, so what counts is the distance from the shoulder to the ogive. That is the difference between the headspace dimension and the ogive dimension. Regardless of the headspace dimension, the difference between the ogive and the headspace will always be the correct number to use. I set bullet length to the difference between the ogive and the headspace. Whether you are using a new case or a fire formed case will not matter if you set your bullet to the difference between ogive and headspace.
That is a very good point. Thanks for bringing it up. Since reading your comment earlier today I have been thinking about how to measure "headspace to ogive" easily.
Once you size the case, assuming you do that consistently (and if not, then there is no reason to worry about bullet seating depth :) ) the CBTO is an accurate measure of seating depth. If you are REALLY concerned about getting the exact headspace to Ogive measurment, get a Forster Datum Dial set, and measure the case base to shoulder, and then subtract that from the CBTO.
@@tanarosegreen6175 The CBTO is an accurate measurement of seating depth to the base of the case, but the datum of the case is the shoulder and not the base. So, the dimension that really counts for seating depth to control bullet jump is from the shoulder to the ogive. If you control seating depth from the shoulder (datum) to the ogive, you can easily control bullet jump whether using a new case or a fire formed case. Or, as in the video when measuring where your bullet contacts the lands with a base to ogive dimension, you shouldn't need to modify (thread) a fire formed case for the ogive gauge to get an accurate measurement if you use the difference between CBTO and headspace.
@@sdkweber This can easily be done with the "Accuracy One Seating Depth Comparator, " which is what I use. Make a cartridge with a properly seated bullet and measure the datum to ogive with the comparator. This will be your baseline value (or zero value, if you wish) when you seat the rest of your bullets. Do note, however, that it will take measurements from an arbitrary datum line and an arbitrary ogive. Measuring the datum to ogive length will be relative to other cartridges so long as the same cartridge caliber is used and the same make/model/weight of bullet is used.
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Excellent explanation. Very well done. Thanks.
You are welcome. Thank you for watching and taking the time to post.
Great information, delivered very well in an easy to understand presentation. Appriciate the effort you put into the video. Thank you.
You are welcome. I appreciate it and thank you for watching and taking the time to post.
Very helpful! Thank you so much
You are welcome. Thank you for watching and taking the time to post.
I wonder if a shallow cup shape that is the right size for different case heads would work in place of that anvil. Might eliminate some of the spinning the cartridge to square it up. But then I'm not measuring every cartridge coming off the press, first 3 or 4 and they are consistent then one periodically maybe every 20 as spot checks.
I have been thinking about a better way also. I talked to the folks at 21st Century reloading and we discussed an anvil that is essentially a case holder also. That may eliminate all wobble and make the measurement as exact as possible.
I have been using the .22 cal insert to measure the .308 bullet seating depth. I don't understand if all we are doing is to find max COAL so I can set the die to seat .020 less, why would it matter where on the bullet we are taking measurements from as long as it's not the tip? It's a relative measurement anyway, so why must it be taken at the Ogive and not somewhere above it. Can you explain? Thanks.
If you are really trying to seat the bullet so it is just off the lands, using the correct insert is important. Each insert is designed to impact the bullet at the ogive. That point on the ogive is the same point that will first impact the lands of the rifling.
Alternatively, if you want to get a good measurement of cartridge length, the approach you are using will work just fine. Just be sure you are always measuring using the same insert.
I hope this helps.
I do not bother with a fired case to ensure that I am getting an accurate ogive dimension. The shoulder is the datum and not the base of the cartridge, so what counts is the distance from the shoulder to the ogive. That is the difference between the headspace dimension and the ogive dimension. Regardless of the headspace dimension, the difference between the ogive and the headspace will always be the correct number to use. I set bullet length to the difference between the ogive and the headspace. Whether you are using a new case or a fire formed case will not matter if you set your bullet to the difference between ogive and headspace.
That is a very good point. Thanks for bringing it up. Since reading your comment earlier today I have been thinking about how to measure "headspace to ogive" easily.
Once you size the case, assuming you do that consistently (and if not, then there is no reason to worry about bullet seating depth :) ) the CBTO is an accurate measure of seating depth. If you are REALLY concerned about getting the exact headspace to Ogive measurment, get a Forster Datum Dial set, and measure the case base to shoulder, and then subtract that from the CBTO.
@@tanarosegreen6175 The CBTO is an accurate measurement of seating depth to the base of the case, but the datum of the case is the shoulder and not the base. So, the dimension that really counts for seating depth to control bullet jump is from the shoulder to the ogive. If you control seating depth from the shoulder (datum) to the ogive, you can easily control bullet jump whether using a new case or a fire formed case. Or, as in the video when measuring where your bullet contacts the lands with a base to ogive dimension, you shouldn't need to modify (thread) a fire formed case for the ogive gauge to get an accurate measurement if you use the difference between CBTO and headspace.
@@sdkweber This can easily be done with the "Accuracy One Seating Depth Comparator, " which is what I use. Make a cartridge with a properly seated bullet and measure the datum to ogive with the comparator. This will be your baseline value (or zero value, if you wish) when you seat the rest of your bullets. Do note, however, that it will take measurements from an arbitrary datum line and an arbitrary ogive. Measuring the datum to ogive length will be relative to other cartridges so long as the same cartridge caliber is used and the same make/model/weight of bullet is used.
@@Aladinoricco Thanks for sending this. I looked into their website and that tool looks very promising.
You could just superglue a shell holder to your anvil. I like the idea of hornady selling the anvil already setup that way
That's funny. Thanks for posting.
Not wearing your hat/coat.
You are correct... too hot here when I made this video. Probably didn't recognize me with the hat and coat. :)