I started with a 7mm STW when it first came out and you had to use
8mm rem mag brass and the only ones to offer loaded rounds was A Square
with 140's and 160's.
I had the velocity bug "bad" and at the time there was nothing like it so I had
a 31'' fluted barrel screwed on a Browning B 78 High Wall and went for all
the velocity I could get from a 140 ,I managed 3592 but with max loads
lost accurace until I backed off to around 3500ftsec.( still one of the
bad'est boy's on the block).
Enter the 7RUM. with available brass and more case capacity it will exceed
the STW and is the current contender for the flatest factory cartridge offered
and will clean up a STW chamber.
With the new powders it will perform better with big bullets than the STW.
My standard 7 RUM 140gr load is 3548 ft/sec in a 26'' barrel and little or
no signs of pressure. one of these days I will screw on a 30'' tube and
see what it will do.
Just another option
J E CUSTOM