7mm Backcountry anyone?

[ismith]

No idea. Is that what Federal recommends or is this satire?

Is it reloadable or not?

 

[Alpine01]

That’s poor physics. You didn’t account for the mass and velocity of the powder. I don’t know what velocity they use for burned powder in recoil calculators, but it exits the muzzle at a much higher velocity than the bullet does, and thus 1gr of powder increases recoil more than 1gr of bullet. The decreased powder charge of the 7BC compared to the magnums results in it having very similar recoil despite the increase in performance.

Fair point - in my example I was assuming same powder charges. But your right, the 7mm BC is probably running something in the neighborhood of 50 gr vs a 7mm RM at roughly 65 gr. But this is partially offset by the higher pressures generated in the BC.

 

[yakimanoob]

More slightly off physics.

Momentum is always conserved.

Fair enough - I was playing too fast and loose between momentum and total kinetic energy.

 

[ImBillT]

Fair point - in my example I was assuming same powder charges. But your right, the 7mm BC is probably running something in the neighborhood of 50 gr vs a 7mm RM at roughly 65 gr. But this is partially offset by the higher pressures generated in the BC.

My guess is that the 7BC is closer to 60-63gr. IIRC I’m shooting 61.5 in my 280AI. I’d have to look. The 7BC would likely use a similar powder charge of a slightly faster powder. I was originally thinking the 7mag tended to use more powder than most load data suggests. It isn’t as much larger than a 280AI as I thought it was.

 

[ImBillT]

Is it reloadable or not?

Last I heard Federal said something along the lines “yes if you follow our method”, but I’m not aware of them publishing any methods. So unless someone has new information, then would lean toward saying that it is not currently reloadable.