Yes, the diameter of the standard "small pistol" primer is sufficiently less than the standard "large pistol" primer that it is obvious with the naked eye. I think its 0.175" vs. 0.210". Not huge, but enough that I can tell them apart without my reading glasses. So as I size cases, I just glance at the primer pocket and throw the small ones in a separate bin.
If you try to insert a LPP into a SPP case, it will not insert. You definitely don't want to force it or apply excessive force.
If you have some "Blazer Brass" 45 ACP rounds, take a look at the primers compared to some other brands. You will see the smaller primers on Blazer Brass, some Federal and some Winchester cases, among others. The last batch of range pick-up 45 brass I got had small primer pockets on about 10% of the total cases.
If you try to insert a LPP into a SPP case, it will not insert. You definitely don't want to force it or apply excessive force.
If you have some "Blazer Brass" 45 ACP rounds, take a look at the primers compared to some other brands. You will see the smaller primers on Blazer Brass, some Federal and some Winchester cases, among others. The last batch of range pick-up 45 brass I got had small primer pockets on about 10% of the total cases.

Most are left behind for a reason, you get my point.
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