I have shot many, many kegs of 844 in the 223 and 22 PPC.

Use thick cup primers such as the Rem 7 1/2, CCIBR-4, CCI450, or cci 41.

I did shoot 50g and 55g bullets out of both the 223 and 22PPC.

If you are cratering primers, the win primers have soft thin cups and will show pressure quickly. Your firing pin hole in the bolt may need to be bushed.

Since barrels, twist rates, and lot# of powder in 844 will affect loads, I will not list the loads that I shoot.

I do a test similar to Grand's, but with the use of thick cup primers in rifles that have no excessive clearance around the firing pin that eliminates cratered primers, I get a lot higher velocities.

If you judge high pressure by the flatness of the primer and case head scuffing, you are using better indicators of what a max load is with your gun and bullet weight you are shooting.

WC844 is very similar to H335 and WC 846 is similar to Ball C2.

Out of my 26" barrel in 223 with a match chamber, extreme accuracy is at 3450 fps. In the 22PPC, groups in the high .100's and low .200's is norm at 3550 fps.