Thank you for doing these videos, its appreciated. I have the insert that is the 6.5 mm 30 degree that I use for a creedmoor. I was wondering if it would also work for my newly built 25 creedmoor as it has the same shoulder angle? Does the neck diameter play a significant enough role that it would negitively affect the measurment? Thank you in advance for your reply. I want to thank you for your excellent products. I use your press and think its the bees knees. (its awesome in modern vernacular).
I honestly don't see a need to have a datum style gage if your purpose is to resize your brass. I really cannot think of an example where a Datum style gage would give you better results. Espeically if you're trying to measure a 6mm BR brass before fireforming into a 6mm Dasher. Our Headspace gages do an extremely good job with "wildcat" or Ackley cartridges.
The one exception is the Weatherby cartridges with the double radius shoulders. SAC doesn't make a radius shoulder headspace gauge, but the Datum insert works pretty well for me. Other than that, I haven't found the need to use anything but the standard headspace insert. Best tool on the market for headspace. Also fits nicely on their powder funnel, which is a nice bonus...
@@HockeyDad6631 Great response, you are correct that we are not making a double radius insert for the Weatherby cartgridges at this moment. I have considered it and we may still make one.
Does the advantage over the datum insert hold for brass that has been fire-formed and then resized? Assuming the shoulder angle of the chamber is correct then a piece of fired brass will have the correct shoulder angle which would be maintained when resizing with the SAC die I am using. If shoulder angle is maintained, then the datum style insert should work well I would think. Am I missing something?
Mike, your example would be a good use for the Datum insert, however I still believe that our standard inserts with the shoulder angle, neck/shoulder radius and neck diameter would give you the best representation of how your brass will interface with your chamber.
The Datum inserts do not have any angled geometry, it is just a straight hole through the body. Also, it would say "D Datum" or whatever size you have. The insert should have engraving on the face to identify it.
Thank you for doing these videos, its appreciated. I have the insert that is the 6.5 mm 30 degree that I use for a creedmoor. I was wondering if it would also work for my newly built 25 creedmoor as it has the same shoulder angle? Does the neck diameter play a significant enough role that it would negitively affect the measurment? Thank you in advance for your reply. I want to thank you for your excellent products. I use your press and think its the bees knees. (its awesome in modern vernacular).
Thank You! I was just wondering about this!
When _would_ you want to use the datum in particular over the shoulder reference?
Honestly, never. Like he said, your chamber shoulder junction is not a datum, its a cone.
I honestly don't see a need to have a datum style gage if your purpose is to resize your brass. I really cannot think of an example where a Datum style gage would give you better results. Espeically if you're trying to measure a 6mm BR brass before fireforming into a 6mm Dasher. Our Headspace gages do an extremely good job with "wildcat" or Ackley cartridges.
The one exception is the Weatherby cartridges with the double radius shoulders. SAC doesn't make a radius shoulder headspace gauge, but the Datum insert works pretty well for me. Other than that, I haven't found the need to use anything but the standard headspace insert. Best tool on the market for headspace. Also fits nicely on their powder funnel, which is a nice bonus...
@@HockeyDad6631 Great response, you are correct that we are not making a double radius insert for the Weatherby cartgridges at this moment. I have considered it and we may still make one.
Does the advantage over the datum insert hold for brass that has been fire-formed and then resized? Assuming the shoulder angle of the chamber is correct then a piece of fired brass will have the correct shoulder angle which would be maintained when resizing with the SAC die I am using. If shoulder angle is maintained, then the datum style insert should work well I would think. Am I missing something?
Mike, your example would be a good use for the Datum insert, however I still believe that our standard inserts with the shoulder angle, neck/shoulder radius and neck diameter would give you the best representation of how your brass will interface with your chamber.
@ShortActionCustoms how do I know which one I have?
The Datum inserts do not have any angled geometry, it is just a straight hole through the body. Also, it would say "D Datum" or whatever size you have. The insert should have engraving on the face to identify it.
@@ShortActionCustoms thanks I have the 30degree engraving. I appreciate the new videos
100% + no mark on the case shoulder from sharp edge comparator