WildRose
Well-Known Member
If it's pinching at the case mouth you may want to trim them back a hair.Long Range.
That also seems like a very light bullet for the 7RUM.
In my faster 7's I tend to get best results between 162-180gr in conventional and 150-165 with mono's.
Might also consider having the neck reamed just enough for "no turn necks".
That pinching can cause really dangerous pressures, I had the same issue with one years ago.