I have had greater variations in velocity due to temperature, and different barrels, than I saw with WLP versus WSP primers
Rock Island Arsenal GI M1911 5" barrel
230 FMJ 7.8 grs AA#5 Lot DM WLP OAL 1.265" taper crimp 0.469" mixed cases
13-Sep-18 T = 82 °F
Ave Vel = 815.4 fps
Std Dev = 18.02
ES = 68.22
High = = 847.6
Low = 779.4
Number rounds = 28
230 RMR FMJ 7.8 grs AA#5 Lot DM small primer brass WSP OAL 1.265" , mostly Blazer brass
taper crimp 0.469"
10-Jun-20 T = 91 °F
Ave Vel = 805.6
Std Dev = 12.56
ES = 39.38
High = = 822.4
Low = 783
N = 16
small pistol 45 ACP goes bang and where it was aimed.
Might be better to start off with small primer brass as no matter how diligent you are, after collecting your fired brass at the range, a small primer case will make its way into the can. I pick up my fired 45 brass in the area, and there have been times the case under the visitors chair was not mine. And it was small primer, and I was shooting large primer. Even if, as I have tried, inspecting all the case bottoms, the size difference between small pistol and large pistol is not glaring enough to always see the small pistol primer case.
This is a real problem when using a progressive as I have had a number of times when resistance to priming on my Dillion 550B revealed a small primer case over a large primer. The danger is, primers do ignite when compressed. There are enough pictures on the web showing the damage that happens when this happens. Including in hand primers!
I have a can of small primer range pickup brass, and I don't shoot small primer the same day I shoot large primer. Too risky when collecting. Trying to insert a small pistol primer in a large pistol primer case is a nothing burger. It feels too easy, and the primer falls out anyway.
I really wish ammunition manufacturer's had not introduced small primer 45 ACP brass, as I have ammo cans of large pistol. Small primer brass is just a risk to me, luckily no kaboom's during repriming yet! But never say never. This is literally playing with fire. This is another example of Corporate
Externalities.