I run N550 in my 224V. 26 grains gets me 2830 and 27.5 gets 2960 with 80.5 Bergers in Starline brass with CCI 400 primers. 27.5 is a warm load, near max. Think I might try the N555 with 90 SMKs and see what I can get with those, might be too slow burning for the 224V. I also run N550 in the 22GT and 90 SMKs, nice load running 3085. I can get 3130 with N555 but it is 2 full grains more than the N550 load, it is slightly compressed and I am not sure the little bit of speed is worth it.
N550 is temp sensitive, we tested it. I keep the ammo box in the cooler - not on ice - upper tray of cooler to maintain a 70ish degree temp. Shoots great but it is temp sensitive.
I am going to be trying the 22GT later this year as a match rig, right now I will stick with the 6mm. The issue with running the 224V in matches is impacts at distance. As mentioned already, it becomes difficult to see impacts around 750 and out and we do not use hit indicators. I kept it as a trainer, lots of fun to shoot and a great cartridge to teach people.
N550 is temp sensitive, we tested it. I keep the ammo box in the cooler - not on ice - upper tray of cooler to maintain a 70ish degree temp. Shoots great but it is temp sensitive.
I am going to be trying the 22GT later this year as a match rig, right now I will stick with the 6mm. The issue with running the 224V in matches is impacts at distance. As mentioned already, it becomes difficult to see impacts around 750 and out and we do not use hit indicators. I kept it as a trainer, lots of fun to shoot and a great cartridge to teach people.