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Any time you get new brass, you've going to find variations in their head space. This is why its a good idea to fire form them to your particular chamber before you do any load development and you don't want to measure case volume until they're fired in you chamber to you have the proper case volume to your loading.View attachment 8719896
If this output is correct, and I think it is, 42.4 gn Varget only burned 95% of the powder. 44gn, as pictured, would burn 100% and remain well below max pressure. Predicted MV is 2725, right where I was working on the higher node and ran into pressure signs. Gonna try working the charge upward starting a bit below 44gn and see what happens, then start over with new components when they arrive.
Do you guys do anything to new Lapua brass? I know there are lots of opinions. I’m inclined to just load it and shoot it, use up the sierras and Varget for fire forming 300 new cases.
Personally? Don’t care as I would never buy one. It is still the best design I have seen on this thread. From a practical point it is not threaded, so if it did sieze it would not be that hard to remove the outer cap and using a “T” puller ( make one out of a drywall T bolt if all else fails) yank it out, carbon does not resist linear force very well.What happens if the inner piece gets stuck?
Just an FYI: When measuring case volume, I've found the best way to get a good measurement is when you've slightly over filled the case and trying to get it level to the case mouth, I use a light source (like a small flashlight) and shine it on the water where I can see whether the water is concave, level or convex. It's very easy to see that with a light source. Then, I take a small piece of paper towel to wick the water down until it's level (I do this while the case is sitting on the scale and the scale has been zeroed with the case on it). Sometimes I wick too much resulting in it being convex, where I put a small drop back on and re-wick to level. It doesn't take much water to change the weight indicated, especially on a good electronic scale. To wick just a small amount of water off, I'll just touch the water with a couple fibers sticking out of the piece of paper towel. Also note, that it's best to do 10 cases, as that give you a much better report of case volume for your lot than doing just 3 to 5.Wish I’d seen this a year ago. Setting up GRT now, measuring case volume, see what it says.