You should get good velocities. Compressed loads aren't generally an issue. The only problem I've ever had was with bullets backing out. Since I didn't want to crimp I switched from WW brass to Remington and it cured the problem.
Shoot loads with 3 cartridges in the magazine. After the first shot add another, so on and so forth. Then compare the ogive measurements for the bottom 3. You'll know right away if you have a problem.
Privy Partizan is the thickest at the neck that I've found. They actually make good brass (IMHO).