Federal New Cartridge

[cmahoney]

Ok, I just got slightly more intrigued by these new fangled cases. I’m pretty sure I have a slow twist 243 tikka barrel I pulled off a donor. I also have some 55gr Hammers I use for a very low recoil 243 round. Quick math in my head says 4k plus, for the cost of a few of these cases and some time at the bench. Hmmmm


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I get 4000 FPS with 55 grain ballistic tips out of a 24” .243 with 8208 in brass cases.


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[roadrunner]

Him and Spomer have already made a video touching tips and raving about the authority this cartridge brings to the table.

*Spomer and he. You use "he" to replace the subject name Joe VonBenidict.

Yeah, I'll go all holier than thou and church it up a little

 

[Flyjunky]

Hornady the other day said on their podcast, they see more correlation with throat erosion to powder volume vs bore size and little to do with pressure. Comparing some 50k cartridges vs 63k.

S2H said on their podcast, rcbs is stalled in building reloading components for it, it taking as much as 12 passes through a die to resize. If that's the case, this is DOA for anyone but the factory gun, factory ammo guy. And at $4+ per round, it's unlikely anyone will be shooting this enough to be proficient at the long ranges the cartridge is meant for.

I agree, the success of this cartridge, long term, will be tied to the ability to reload these cases.

 

[z987k]

I get 4000 FPS with 55 grain ballistic tips out of a 24” .243 with 8208 in brass cases.


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Get 2ish firings from that? You're likely north of 70kpsi.

 

[solarshooter]

Recoil comparison for a 7PRC and 7BC at the same speed, with my best estimates of powder charge and accounting for higher muzzle exit pressure/powder velocity increase due to higher chamber pressure (e rif is the column for recoil energy):

Tiny difference in recoil. We could debate on muzzle exit pressure/powder velocity increase at bullet exit, or better yet maybe someone could run some Quickload/GRT iterations and post those pressure curves for assessment. But from this I don't see a benefit other than maybe the 7PRC cannot actually hit 3k in 20". Running a 28 Nos which I think can do that no problem:

So in that case there is a more noticeable difference. However I'm now a little skeptical the 7BC can even hit 3k in 20" at 80ksi... again need some Quickload investigations to see if that actually works.

Fundamentally though I don't see the benefit of higher mv with the 175 class 7mm - it's still an 8mph gun and terminal ranges are still STUPID far. It's just more recoil.

 

[solarshooter]

Some more thoughts on barrel life. Higher pressure means higher temperature. My understanding from discussions on double base powders is that higher temps mean faster barrel erosion. Therefore I would not be surprised if barrel life is more consistent with the larger powder charges. Despite what marketers want you to think, you can't fool physics and there are no free lunches!

I would say at this point the only potential benefit I can identify is shorter barrel length, but even that is a little suspect to me.

 

[Article 4]

Looks like Weatherby is up with their announcement in the 307 and the Mark 5

 

[doc holiday13]

It’s getting blasted because it’s only adding to a performance stat (velocity over 3k) that shooters care less about every day as other tech increases.
What happens when another company comes out with steel case ammo for a 7rem, 7-08, or PRC in a couple months? The backcountry will be irrelevant, for those who cared in the first place, before the ‘25 hunting season even starts.

Exactly. the cartridges will be harder to make in steel so no smaller outfits will wanna make it in steel so they'll make a brass version.

 

[solarshooter]

OK I did some more digging, looks like people are getting about 2900fps with handloaded 7PRC and 175/180s. Backfire's video showed 2880 from a 16" barrel with a 175, so adjusting up to 20" using 25fps/in we do get about the advertised 3000fps. So with those numbers:

Slightly more MV for slightly more recoil. And the same wind number.

 

[BelowAverageBowhunter]

I'd really like to see a bore scope after 700rds I'm thinking the barrel life on this one is going to be right in line with all the other overbore stuff doing these speeds even with the reduced charge. I've seen more fire/pressure cracking problems than throat erosion on my barrel burners and I'm guessing the 17k psi increase isn't going to help.

 

[gbflyer]

I got the notify me when available email from Powder Valley. Looks like $50-$65 per box for ammo.