I decided to experiment with some 200 grain flex tips today before the wind got so bad the chronograph blew over.
I tried s51.0 grains of RL-7 and some very old (1973) CCI-250s in rem Brass loaded to 2.780inch COL with no crimp. This powder load previous pushed Hornady 200 grain round nose bullets to 3,011 from my Ruger M77MKII all weather.
It pushed the red tipped spire type FTX bullet to 2,750 fps and a 1.0 inch group at 100 yards. There were pressure signs and this is as much RL7 that I would ever use.
Then I tried some RL10x. I could not find any data so I worked up some loads based upon similar powders. The max being 58.0 grains.
Once again I used the old CCI250s and Remington brass, with a COL of 2.780 inch and no crimp.
This RL-10x load pushed the 200 FTX bullets to a low of 2,982 and a max of 3,016 fps. The group was 1.70 inch and the holes looked odd. Like maybe they were yawing. There were pressure signs as well. Backing off to 57. grains still puts it into the 2,900fps + range, but I need more time to make it an accurate load.