Velocity of BR4 primers vs Wolf SRM, 77gr, XBR

If anyone is curious, I ran a little experiment the other day with my new Labradar! 6 shots were fired at each interval. Cases with 23.3gr and wolf powder just started to show pressure signs, as did cases with 23.2gr and BR4 primers. Despite the graphs showing the BR4 as being faster, I'd say that the pressure signs correlated very well with the velocity, regardless of primer. So in other words, the Wolf cases could take an extra 0.1-0.2 grains and have equivalent pressure and velocity to the BR4 cartridges.
Groups and SD's seemed to be best around 22.9gr for both powders, but I need to shoot more than 6 shots to get better data. SD's ranged from 5 to 17, with an average around 10. Groups at and around 22.9gr were very good so I will likely stay there, and the SD's seemed to be lowest there as well.

Powder 8208XBR
77gr TMK
Case: Norma, New
Barrel: Centurion 18" with SF SOCOM 556RC
Velocities are from 15 yards. I did this because that is the distance used in my reloading book by Nosler.
Temperature.....116F. That isn't a typo. It was Hot AF

The wolf SRM string is missing a data point because I didn't notice the batteries had died. Luckily I brought spares.

Attachment 39887

Thank you for this. I use CCI 450s per Onyx and always wondered what using standard primers would do to the velocity. Not sure how Wolf and CCI SRM primers compare, however.