As a young man I read Bob Hagel's exploits with his 7mm Mashburn Super Mag ( I think he claimed 3100/175?) . My best speed I could get my 24" Rem Mag to was 2950/160. Later in Life, I have tried 26" 7mm STW's, a 7mm RUM and a 26" Rem Mag. I was never able to get his storied speeds. I have read where both the 160 and 175 could actually be ran at these speeds, but how are they doing it? Are they exceeding the pressure limits? Now I read in a few places where a 24" barrel 28 Nosler ( a shortened RUM) has done 3300/160? How can this be? The ONLY reason I EVER wanted ANY 7mm Mag was for these speeds, ha. Not for LR Hunting but stretched string 400yds and big thump on big critters. I easily got 3200/210 XBT/340 Wby, but it was not 7mm! ha How did Uncle Bob do it? Opinions?
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