The bug has bit me. Recently purchased an m&p 9mm as my second handgun, not long after purchasing my first; the m&p 22. Needless to say I am enjoying shooting quite a bit 
A long-winded post and a few in-depth questions so I will appreciate any replies.
Looking for advice on a few things regarding the 9mm and have found this the best source. Thus far I have shot UMC and WWB. Also picked up some federal champion which I am going to try soon.
My question though regards Sellier and Bellot 115 gr FMJ which I have found on sale locally for 9.99 a box. I've been reading very mixed things on the web about this ammo regarding how hot the load is. I have found info saying that these rounds are loaded significantly hotter. Some sources saying it is equivalent to +P. Some saying it equivalent to +P+. Some saying NATO spec. Some saying far hotter than any +P+ that they have ever shot.
SAAMI vs CIP standards? Is all European 9mm ammo(Sellier and Bellot and Fiocchi in particular) loaded hotter? Say to the equivalent of our +P? or +P+?
My biggest concern is I in no way want to cause accelerated wear on my gun and it sounds like a steady diet of +P can do such? How about different weight recoil springs different from that of the factory spring which I understand is 16#? Is it something worth changing on the days you shoot hotter ammo as in +P? or NATO? or simply the Sellier and Bellot?
***I also saw one valid sounding argument against changing springs***
Saying that yes a stiffer recoil spring may slow slide blowback for hotter loads but that it also slams that slide forward that much harder. Validity?
***Again my biggest concern is that I do not want to cause premature or accelerated wear on my gun. Is sellier and bellot ok to use in that aspect. With only a factory recoil spring???


A long-winded post and a few in-depth questions so I will appreciate any replies.
Looking for advice on a few things regarding the 9mm and have found this the best source. Thus far I have shot UMC and WWB. Also picked up some federal champion which I am going to try soon.
My question though regards Sellier and Bellot 115 gr FMJ which I have found on sale locally for 9.99 a box. I've been reading very mixed things on the web about this ammo regarding how hot the load is. I have found info saying that these rounds are loaded significantly hotter. Some sources saying it is equivalent to +P. Some saying it equivalent to +P+. Some saying NATO spec. Some saying far hotter than any +P+ that they have ever shot.
SAAMI vs CIP standards? Is all European 9mm ammo(Sellier and Bellot and Fiocchi in particular) loaded hotter? Say to the equivalent of our +P? or +P+?
My biggest concern is I in no way want to cause accelerated wear on my gun and it sounds like a steady diet of +P can do such? How about different weight recoil springs different from that of the factory spring which I understand is 16#? Is it something worth changing on the days you shoot hotter ammo as in +P? or NATO? or simply the Sellier and Bellot?
***I also saw one valid sounding argument against changing springs***
Saying that yes a stiffer recoil spring may slow slide blowback for hotter loads but that it also slams that slide forward that much harder. Validity?
***Again my biggest concern is that I do not want to cause premature or accelerated wear on my gun. Is sellier and bellot ok to use in that aspect. With only a factory recoil spring???
