I have Lapua brass in .308 and have been told to reduce my charges by 0.60 over the other brass I was using. Reasoning was the Lapua brass is thicker (overall) and therefore less volume and by reducing the chrarge I will maintain the same pressures.

Does this sound right? Should I reduce the charge to maintain he same pressures? I think the .6 was a result of measuring water in both casings brands and measuring the difference.

BS, lapua will withstand pressures that will destroy Remington.
RR

O.K. I meant that by maintaining "pressures" . . . I would be maintaining muzzle velocity. Or at least coming close. In other words, 43.4gr RL 15 in a Lapua brass will produce the same MV as 44gr in a Winchester brass. No?

maybe, only way to know is chrony it
RR

I have already thrown a lot of Lapua brass out because the primer pockets got too loose to hold a primer. Might be some kind of indicator. (higher pressures)
So none of you have heard this "rule of thumb"? To lower the charge when using Lapua.

Irun lapua brass in my 7mm AM, have never had a loose pocket, the cases get work hardened and pressures go up.......in hot weather they go way up, at 80 degrees it will push a .284 160 gr accubond at 3700 fps, and pierce the primer but the pocket is still tight.
if your loseing the pocket with lapua brass you are way overpressure for some reason.
RR

Well when I'm working up a load I always start .020" off the lands (.050" for Barnes), always use published load data. I'm still relatively new to reloading, but feel I'm pretty careful.
So you load the same charge in your Lapua as any other brass?

yep, lapua is the best there is, no prep and takes way more pressure than remchester
the last rifle I ha d built, I wanted a 20 cal, the 204 was top of the list, then I found out lapua made 20 tac brass, for that reason alone I went with the 20 tac. its that good
RR

what powder you running in the 308 that loosening pockets? could be the powder is too fast and peak pressure is happening prematurely and going overpressure
RR

Over time I've tried 5320, Varget, RL 15, 4064, probly the "fastest" would be 4895.
Mostly loading 165 - 168 gr bullets. WLR primers.
When I say loosened pockets I mean the primer would hold, but went in too easy and I believed it to be a liability. In fact did find a couple reloads where the primer had fallen out.