Can't answer that...but I just bought and started breaking in a new SLP this weekend, so I have some data and suggestions. I'm not sure this thread is in the right place for that, but I'll give you the short version.
Conclusion: the SLP is perfectly capable of cycling even 1 ounce/2.75 dram equiv loads...but here's what I did.
Clean all the factory goo out, it's too thick.
Relube with light lube (FN says nothing with teflon in it, btw, which includes RemOil, tho FN people will tell you on the side that RemOil is OK)
Change the installed black/heavy piston for the red/light piston (the manual suggests that the red comes installed, but that does not seem to be how most arrive)
Expect to have to hand-eject the first 50 or so rounds if you use low-recoil loads.
After about 50 rounds, the Fed Tac loads I shoot
and slugs) were 100%. After 150 or so even the Fed "Top Gun" (why do they call them that?) 1 oz/2.75 de loads were 100%, which is pretty darned good, considering I don't think you can buy normal commercial loads that are any lighter than that.
So, fear not, but follow directions and expect a break-in period.