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All things being equal (using Winchester white box as a baseline) would 124gr or 115 grain be "hotter", harder on the gun, etc?
It has just always confused me why there isn't a simpler system for how a round is branded vs what it actually does.
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There is regular Winchester 124 FMJ and Win. 124 FMJ NATO (M882) with the NATO being a little hotter. Also regular Win. 115 FMJ bulk and the new 115 FMJ TC (the new US Army load) that is quite "hot".
But there few hard and fast rules about ammo. The most important thing is that the grain (weight of the bullet/projectile) is meaningless when talking about "hotness" or power.
If you are looking for mild-medium loads, try CCI Blazer Brass (or aluminum nowdays). I dont know if Remington even exists now but their 115 FMJ loads were always very mild and decently accurate. Also Magtec (Brazil) 115 and 124 is good medium power ammo. S&B 115 seems like "regular" or full-power ammo to me and very accurate. Federal and American Eagle are very good and can be mild or medium but I've never seen "hot" Federal FMJ ammo except JHP like HST.
I personally dont like Winchester FMJ ammo since it seems to have the most dead primers and even the oddly long case that causes a PITA to clear.
I would just see what is cheapest and specifically look for Blazer Brass, Magtec, or S&B.