Originally Posted by Hobo
....... Thank you sir!!! This is exactly the information I was looking for
... So you recommend two bushings, 0.001" and another one 0.002" less than twice the case wall thickness plus the diameter of the bullet,,,,, correct????
Where is the best source for ordering these reloading essentials??? Sinclair International???
Thank you VERY much for sharing your knowledge,,,,,, and a very sincere thank you to the others that also replied
This sharing knowledge certainly beats the "School of hard knocks" as well as trying to reinvent the wheel!!!!!
Thanks again guys!!!!!!
Using calipers or a case neck micrometer, measure a sampling of your case neck wall thicknesses. You might get readings anywhere from .012-.018". Within a given lot of Lapua brass, I would expect something like .014-.016".
Take several samples from each case neck to see how consistent they are. If they vary more than .002" per case, then you may want to consider neck turning.
Once you have an average, calculate the required bushing size for the average and order that plus one each .001" greater and less than.
Size one or two cases with the desired bushing and measure the inside diameter. You can expect about .001" worth of springback from the brass. But, less than .001" worth of tension is too little and more than .002" is unnecessary and overworking your brass.
Sinclair, Grafs, Brunos, Midway, Russ Haydon and many others stock what you need.
You're most welcome to the information. I hope it helps. But, sometimes we lose important pieces in the translation.
If I've mislead you, then someone will hopefully jump in and clarify.
For the price of a McWhorter rifle, they should provide you with some handloading training. Enjoy the new rifle. I'm sure it'll be an excellent shooter.