I shoot a .300 RUM, been using the 200gr Accubond & 220gr MK with great luck, 1/2in groups with a factory Sendero other than the trigger. As for 7mm 140gr or 160gr Accubond & 168gr or 175 MK in front of a healthy dose of either R22,R25,7828 or Retumbo anything slow burning should produce. I Favor all the heavier bullets with the Ultra Mag's. The triple shock performed ok in my 300 (1.0in). Kinda pricy for my likings but tough as hell 98% to 100% weight retenion in wet phone books. The Winchester Fail Safes can penetrate lots of phone books also with 100%retenion. I have shot 2 doe with both rounds one at 236 yards w/the Accubond and on at 60yd w/ the MK. The 220gr Match King at 3083fps does some bookoo damage man... the inside looked like jello massive wound channel. A bit to fast for 60 yards go with the 160 Accubond and dont look back!! good luck
Shooting a round with the capacity of the 7mm RUM, you should stick to the 160 plus bullets. You have plenty of velocity, and the 160 bullets will outperform the 140s at longer ranges. Also, pushing the 140s at the higher velocities, could cause bullet failures at closer ranges due to being past the velocities the 140s were designed for. Check out trajectories and energies for 160s. 140s & 160s are close out to 350-400 yds. At 500+ yards, the superior BC & SD of the heavier bullets really show up. [img]/ubbthreads/images/graemlins/ooo.gif[/img]
FWIW - I used 139gr Hornady Interbonds this year in my 7mm RUM. The load was 92gr of IMR7828, never chrono'd it but I think its going about 3600. Shot very well, I really put this bonded bullet to the test. I took a whitetail buck at 60 yards, bullet clipped the edge of one shoulderblade, took several ribs, and broke the far shoulder. The buck didn't take a step after the shot. I recovered the bullet just under the skin on far side. Looked just like the ads show it. Retained 68% of its original weight. Not bad for that speed at that range. I am very impressed with the Hornady Interbond, I may see how the 154gr shoots also, it may be just the ticket for critters bigger than a whitetail.