Originally Posted by Coyote_Hunter
Originally Posted by Jordan Smith
Originally Posted by Coyote_Hunter


It is also a fact that a 7mm RM can't beat the.270/150g LRAB/2910fps load at 600 without significantly more recoil - at least not with any load I've found using bullets we would actually use.



That is less a fact about the 7RM, and more a function of your preference in bullets.


So far it is true with ALL the bullets I've looked at, including Nosler, Hornady, Berger, Swift, Barnes, Speer and Federal.

In addition, the .270 chronos 2910fps from Daughter's 22" barreled M700, while all the 7mm RM load data I've looked at (Speer, Hornady, Barnes, Nosler, Accuate, Hodgdon, Lyman) uses 24" barrels. To be fair, we should adjust velocities for equal barrel lengths when comparing the two.

If you are aware of a specific 7mm RM load (or loads) that beats the .270/150g LRAB@ 2910fps without significant additional recoil, I would sincerely appreciate your providing it (or them). The .270/150g LRAB generates a calculated 17.7 ft-lbs recoil with Daughter's 8.3 pound rifle/scope/ammo combo. From what I've seen, you are in 280 Rem or AI territory by the time you approach that level of recoil with a 22" 7mm RM - and the 600-yard performance is below that of the .270 load.


Well, if we’re talking about comparing loads in two specific rifles, then we should clarify the barrel length and twist rate of those barrels. Not an idealized, normalized comparison, but an actual comparison of the ballistics provided by various loads on your rifles. The .270’s 22” barrelled velocity is real world. What twist rate does it have? That makes a difference. If a factory R700 and 10” twist, then Bryan Litz’ testing says the true G1 BC of the LRAB exiting your barrel is around 0.550.

He tested the 7mm 150 LRAB at 0.576 G1 BC using a common 9” twist. Assuming a 7RM of the same weight as your .270, a minimum charge of H4350 or H100v would generate about 18.3 ft-lbs of recoil and about 2830 fps. Likewise, the 162 ELD-X at 2755 fps using a min load of IMR 4451 generates 18.7 ft-lbs. The recoil would be less in a rifle heavier than your .270. Both of those loads drift less in the wind at 600 than the .270/150 LRAB, and the recoil is comparable.

As an aside, the 143 ELD-X from the 6.5 Creedmoor at 2750 fps also drifts less in the wind at 600 than the .270 load, and would recoil even less for her.