Originally Posted by linksmechanic
I was just looking at the hodgdon reloading site and was entering info for the stw to see if it would be worth reaming my rm to stw. They list a 175 grain bullet with retumbo at a maximum velocity of 2967. I'm currently shooting a max load in my 7rm with 68 grains of retumbo and shooting 180 bergers an am getting 2950 fps. What gives? It seems by there data you gain nothing. Am I missing something here. My load is a little hot but there is no pressure signs and is listed as max on there site.
All of the reloading manuals are conservative. So you have to work up to the potential
of each cartrige.
With the same barrel length and max load for each round here is the difference.
The 7mm RUM produces 24 percent more energy than the 7 Rem Mag and 12 percent
more than the 7 STW.
And because of case capacity the bigger 7mm RUM will propel a heaver bullet as fast as
the lighter bullets in the 7 REM.
Don't get me wrong I shot a 7 REM MAG for 1000 matches and it was very good ( I used a
168gr SMK @ 3254 ft/sec ) but it was very hot and with the 7 mm RUM this would be a
mild load in the same length barrel.
The reloading manuals are just a starting point.
J E CUSTOM