Another idea is to use milk crates, two .50 or 3 .30 each. They stack nicely and easily go as high as you can safely lift. Do be careful as two .50 can full of loose 9mm is heavy! They go at the bottom though. You can also make a wheeled platform with the correct casters.
I don't recall the brand but there's a suppressor brake out there that really does work. I have a Nomad 30 with DA's E brake, it's old school but helps. The one referenced above has 2-3 ports.
The FGMM .223 uses the white plastic holders. I like the Norma ones better-only downfall is if you are over 2.260+/- as they utilize a tab to hold the cartridge in, snaps over the base.
oops early and didn't catch Edsel posted that!
Numbers from Hornady 6mm Arc
108, 20 shots, SD 14.2, ES 63.6
105, 19, SD 11.5, ES 45.5
Yeah, ref low number of shots, I was doing load testing on a .223, 80 SMK and Varget, first three were within 1 fps--then I fired 30 more
I just had a 6ARC bolt gun built, 26" barrel. Initial firing last week, box each of Hornady factory 105/108, avg 2741/42. I hope to shoot again this week and possible see some increase as the barrel breaks in.
Just to give you some numbers for the caliber if it helps make a decision.
ATX...
Yeah, I thought I was off spending on the Precision Underground, but 320-fuck that. I get it, market, supply and demand but 90% of this shit in the industry is over priced-by a large margin.