Hey mate
The screamer will eat the rum speed wise it will do 3250 at a cruze with 180s an the rums I have played with won't do over 3100 for the same amount of powder
Both will give you around the 700 round barrel life mine die early due to goats. . . .
Few pros and cons tho.
Rum I find a lazy inefficient case
Have to extend mags feed from it
Cases simple to make
Screamer have to form brass
Dies cost more
Requires lapua mag face
Will feed from standard long action
Will only build on a Remington or custom action
Efficient case for speed
There are also the
7 375r
7 lrm
7 flying wingman
All will do around 3100 with 180 or 3220ish with 162 safely
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