The components for our .375 Socom project are inbound so I bought something for the project yesterday.
There is zero data available for .375 Socom reloading, but we have the maximum data used for the actual SAAMI pressure tests. There's going to be a lot of load variables as we determine supersonic and subsonic loads for the .375 Socom below the SAAMI maximum charges.
Will the load function in the rifle if we use the silencer or will it also work without the silencer? Will a standard muzzle device (suppressor/brake/flash hider) provide enough back pressure to run the rifle action? There's gonna be lots of tinkering with the charge data making 5-6 cartridges with each load and it's pretty tedious setting the measures.
Usually, I select my load, set the charge weight on my powder measure and check it periodically. Not much fussing required. No need for an automated weighing device, Huh?
I have many powder measures including:
4- RCBS Even Flow
RCBS "Lil Dandy" with lots of rotors
4 Dillon RL 550 Measures
2 Lyman 55 measures
Full set of Lee Dippers.
All of those measures take a volume of powder in a cavity within the powder measure and that equates to weight of the charge. If you just poured powder into the measure and it's all fluffy, weight will be much different than after you bang around the workbench and pack that powder down. The same volume of powder will vary in weight. That requires the measure to be free of knocking, tapping or jostling the powder inside.
The Lyman 55 even has a small hammer built into the measure base. Flip that hammer to give each charge the same amount of powder density every time. The conversion of dense or fluffy powder volume to weight is where we get our inaccuracy in powder charges. Check out the "knocker" on the front of the Lyman 55!
http://www.midwayusa.com/product/703838/lyman-55-powder-measure
Enter the RCBS Chargemaster!
Had my eye on this unit for a long time but couldn't justify it due to the way I load. I seldom change the charge weights (it's checked often but not changed) so it makes little sense to weigh each charge like the RCBS Chargemaster does. That unit meters and weighs every charge so there is no volume to weight conversion. It's perfect for the .375 Socom project! Ordered it yesterday.
Flash