Thanks for sharing the information with us on RWS. I use their small and large rifle primers and judging by their performance would like to also try their powders. I never thought primer brand made much diufference but have to admit some of my most accurate groups in several different calibers occur with RWS primers. Best wishes.

Cal - Montreal

Thank's to all, quite usefull information.
I'll start today with 160 gr and 70 gr of 7828 .
Gtrotz

Here I come back with what I do In the weekend, it's not so extensive because my 3 year old grandaughter was visiting us here in the ranch, and are not very pleased with the noise the shots do.

cases: gehmann original 7 x66 SE VH
Primers :fed 215
Powder IMR 7828
Bullet: Sierra 160 gr Gameking BT.
COL : 84.6 mm
Powder velocity concentration
70----------- 2916 --------- fair
71----------- 2980 --------- good
72----------- 3021 --------- very good
73----------- 3070 --------- very good
74----------- 3112 --------- good

None of the shots have excess pressure but the last one (74 gr) was starting to flaten the primer.
What do you think about this ?
Should I try with some more rapid powder like IMR 4831?
Or stay with 7828, 8700 etc?
Do you have some load data for it?
Thank's to all ,I hope it will not be a boring theme
Gtrotz