I am now using in my .401 7.62x39 brass, 414 super mag brass along with 6.5 grendel basic brass, plus i have 401 of new manufacture,all work, am using 27 and 28 grain IMR4227 powder and all function.
The 351 i am using 360 dan wesson trimmed to length and sized, along with some jamison/captech brass with proper headstamp.
So far all good, using 18 grains IMR4227, fun rifles to shoot.