More then 30 years ago I ran a comparison trial on CCI 250 and Federal 215 LRM primers.
I used a 375 HH and a 458 Lott. did 10 rounds of each with IMR 4350 in the 375 and IMR 4320 in the 458 Lott. Used 300 gr Hornadys in the 375 and 500 gr Hornadys in the Lott.
At the time my Chrony was a Beta and waited 5 minutes between each shot for barrel to cool,somewhat.
That 40 rounds in total and it was shot in February in Pennsylvania.
Have not found the records but my recollection is, for hunting purposes less then 18 fps variance with the same primer and about the same between the two primers. So for hunting I use either one.
Now have a Labradar so if time permits and supplies become available I will have to duplicate.