I got a notice Midway has ammo in stock but their shipping is high.

David, does the 7mmBC compare with the 7mmPRC?

I think velocity wise it’s closer to 28 Nosler the big question after seeing how the cartridge is put together is how accurate can it be. The 7PRC is very accurate but is about 150fps slower.
Not sure how accurate these reloads are going to be just because it’s hard to control neck interference with something that has a Rockwell hardness of 38! That’s harder than the Bolt face of your rifle.
I tried to champher the case mouths and all it does is polish the mouth.

Sounds like sizing is going to be a joy. How ironic would it be that Federal makes both the softest and hardest cases on the market

Hey they are listening to feedback

Exactly, I guess they like extremes

Very interesting results reloading 7mm BC. I used 280AI data and started 3gr over max….
Not .3gr 3.0 gr over. Then worked up to 5.0gr over max.
My first shot was slightly faster than book at 2953fps. Next load .5gr higher went exactly same .1 ES . Then worked up until I was 5 gr over and only sped up to 2990.
Barrel was shooting quite a fireball as well with unburnt powder embers flying ( indoor range I had onlookers watching)
I know the factory has Ball powder but not how much because to remove the bullet Horizon had to drill it out.
These results were puzzling as usually you see a big jump in velocity in a two grain powder increase especially when you are running this high of pressures.
Going to try a slightly faster burn rate powder to see if I can get better speeds.

That’s pretty wild. I wonder how tight the factory neck tension was compared to your reloads? I assumed tighter but not drill it out tight.

Would it need that hard crimp for proper ignition like H110 to reach the correct pressure before the bullet is out the door? I know H110 will act as you described if it doesn’t have a serious crimp.

.280 A.I. I like H-4831 SC

What powder were you loading with?

H-4350 in a long action .473" (or a short mag) is a snappy recoil. As I'm sure you know.

I was using 4000MR but now I am thinking it’s going to be a faster burn than that.
Maybe way faster.

Im so impressed by some of yall of this kinda stuff. I read this stuff like I was reading a foreign language, but if I read long enough, maybe I’ll learn to speak it.
What was the Star Trek or Star Wars saying about going where no one else has gone? Keep going guys.

To boldly go where no man has gone before?

It's all physics. And then some chemistry has to be sprinkled in. Here is on example of a powder burn rate chart.

https://loaddata.com/Article/BurnRateCharts/Powder-Burn-Rate-Chart-NEW/159

Yeah, not like those burn rate charts, from fastest to slowest, haven't been around for a looooong time and are constantly updated.

Yes they are updated and don’t take a burn rate chart as gospel just like reloading data in the books is not always the same from one to another.
Here is latest Hodgdon and I can give example’s.

https://hodgdonpowderco.com/wp-cont...ess-Relative-Burn-Rate-Chart-WEBSITE.pdf

This one shows 4000MR way faster than it is BUT it’s in its correct position on the chart JG posted above.
But on the other hand look at N550 on the Hodgdon chart. It’s about right but on JG’s chart it’s showing much slower than it really is. It is slightly faster than H4350 no doubt because I use it all the time.
While burn rate charts can be helpful you need to use them along with a reloading manual to keep yourself safe….. no not really safe because I doubt using them as gospel would cause any catastrophic problems but you might be pulling some bullets.
When you load wildcats or “ boldly go where no man has gone” your gonna be pulling some bullets.

Agreed. Same caution should be used if you use Quick Load. It's an estimate, not gospel.

I used to have to pull bullets, because you are correct. Now that I'm shooting the rifle 20 feet away from the loading bench, when I see pressure I stop climbing in powder charge. It sure does make things efficient. And having my own documents, as I'm sure you do as well, I know what real maximum are. I prefer to do new load development in summer. If it's safe in 95° weather, it's probably always safe. There are published maximum that are way too conservative. And there are some published maximums that are telling the truth.