How did you guys get 7prc peterson brass allready
I can't really help you there unless you cut your case necks for thickness. Then that makes it simple. Otherwise I would email Peterson Brass on what there neck thickness is going to be. They could respond to you. They have in the pass to me.I've got everything I need to start reloading for the 7PRC except a bushing for my Redding Type S dies. Can anyone tell me what size bushing they are using with the Peterson brass?
I tried a .309 but had zero handle pressure with a .282 mandrel or bullet seating. ended up with a .308 and seems much better.My assumption is the neck thickness on Peterson brass in the 7PRC would be fairly consistent in most of 7mm/.284 offerings. I know they are in the 280ai and 7RM. .309 works great in my Peterson 7mm loadings. Do partial or full neck size?
Generally speaking this is spot on with most magnum brass from premium manufacturers.I measure the neck wall thickness of several pieces of brass to come up with an average.
Then double that measurement, add OD of bullet then subtract for the amount of neck tension you want. Example: My 6.5 Creedmoor Lapua brass has an average neck wall thickness of 0.014". Bullet diameter is 0.264". I like 0.002" of interference fit/neck tension.
=0.290" bushing size for non-mandrel method.
This method does require a 0-1" tube micrometer. Mine is a SHARS with readings to 0.0001"
Measuring the OD of neck with bullet seated is the easiest if you have one. If starting from scratch I find the measurement method easier vs. prepping a new piece of brass, seating a bullet, measuring, pulling the bullet, and resizing that piece of brass.