Thread: The next flop?

Originally Posted by Tahr

You can do that with a 22" barrel now. So not a huge gain. My 74 Targex are 2970 fps from a 20". Or are you thinking 3k from a 16" barrel?

Yuck keep your extra inchs to yourself!

I do 2850 in an 18" now its plenty but a little more is always nice or the same but shorter.

GRT suggests 80kpsi would give 2950ish in a 16" with my same powder and bullet. Thats what I mean as well as higher pressure helps a more complete burn with slower powders in short barrels (according to GRT and QL) if you think it matters.

It also suggests that 2970 in a 20 is already in the 65-70kpsi realm. In most bolt actions pressure signs are often not seen until 70-80kpsi often higher

From the articles I've seen barrel life will be similar to a 280 and it appears normal actions will be just fine.
The case material is what allows for the pressure.

May not be for the reloaders, at least not in the short term.

Look at the Spomer YT item on it

I remember reading somewhere that 80 percent of shooters use 20 percent of a cartridges potential. Which reminds me of the old saying beware of the man with one gun, he knows how to use it.

No free lunch in physics.

All steel-alloy case vs. bi-metal like the SIG FURY.

That will be fun to reload (not!)

Also, you can already get 'extra' performance from a standard case, but at what risk/cost?!

Federal own Alliant so probably cut Re26 off to Hornady (7PRC) knowing this was coming out, mines faster than yours! No way I’d pull the trigger on a savage at 80kpsi! I’d want a high quality action

Originally Posted by outdoorlad

Federal own Alliant so probably cut Re26 off to Hornady (7PRC) knowing this was coming out, mines faster than yours! No way I’d pull the trigger on a savage at 80kpsi! I’d want a high quality action

The Savage 110 is actually a strong action, only issue is they are made in the cheap.

Have seen people running a Savage at stupid pressure to the point they wore out the primary extraction cam...

Originally Posted by outdoorlad

Federal own Alliant so probably cut Re26 off to Hornady (7PRC) knowing this was coming out, mines faster than yours! No way I’d pull the trigger on a savage at 80kpsi! I’d want a high quality action

My layperson understanding from what is being said in the blurbs is that the 80k pressure is somehow absorbed/taken up by the steel casing and standard action strength is ok.

Originally Posted by Tahr

My layperson understanding from what is being said in the blurbs is that the 80k pressure is somehow absorbed/taken up by the steel casing and standard action strength is ok.

Yeah again lay person understanding, so willing to be corrected. As I understand it, the weak link in the action is the bolt lugs and face. The still case 'holds' onto the chamber better and so less force is put on those weak areas.?

Originally Posted by whanahuia

Yeah again lay person understanding, so willing to be corrected. As I understand it, the weak link in the action is the bolt lugs and face. The still case 'holds' onto the chamber better and so less force is put on those weak areas.?

I would guess "holds on to the chamber better " and due to less stretch than brass there would be less or no more bolt thrust.

Modern steel ( and some old steel ) can easily contain chamber pressure in the barrel shank and receiver ring.
It's usually backwards pressure that is harder to contain

What I find interesting about this is that the self contained cartridge really hasn't changed a lot in well over 100 years.
A lot of the incremental improvements have come from a gradual increase in chamber pressure as the firearms industry has been able to improve designs and materials to contain that pressure.

This new 7mm case is just another step along that continuum.

If you increase pressure , you need a smaller case head to withstand the excess pressure than what is generated by a magnum case.
So since case capacity is the limiting factor ( standard 7mm backcountry case close to 280 rem volume) the only thing that can rise pressure ( I presume) is loading with faster burning powder …?

Originally Posted by Friwi

If you increase pressure , you need a smaller case head to withstand the excess pressure than what is generated by a magnum case.
So since case capacity is the limiting factor ( standard 7mm backcountry case close to 280 rem volume) the only thing that can rise pressure ( I presume) is loading with faster burning powder …?

If you run out of capacity before a powder gives you the pressure you want then yes, switch to a faster powder. But if you take a few samples of different factory loadings for different cartridges, a lot of them are nowhere near to 100% fill and you can hear the powder shaking around. If you were to take one of those loadings with spare case capacity, you could quite easily keep filling them with the same powder to get up to the required pressure. That same powder is going to burn more thoroughly and completely like you'd expect a faster powder to, because the chamber pressure is so much higher.

See screenshots on the other thread (https://www.nzhuntingandshooting.co....96/index5.html). GRT suggests it's entirely possible (and I'd put money on it being the case) that they're just using a stiff dose of Re26... Which is not something you'd normally consider to be a "fast burning" powder. Yet 80,000psi gives it a 100% burn (for whatever that's worth) in a 12" barrel.

Originally Posted by Friwi

If you increase pressure , you need a smaller case head to withstand the excess pressure than what is generated by a magnum case.
So since case capacity is the limiting factor ( standard 7mm backcountry case close to 280 rem volume) the only thing that can rise pressure ( I presume) is loading with faster burning powder …?

Can simply be more of a slower powder. If you are being limited by pressure and not capacity usually adding powder is a better method once the pressure ceiling is removed.

Ok so now i need to buy some new brass / alloy cases and possibly some slighly faster powder for my 243 and 358win and they will get an extra 200fps.

will be interesting to see what happens as the new tech cases start to trickle down into existing calibers. all the reloading books will need to be redone.
Fasinating to see that they are clamining the limiting factor is brass not the existing actions.
Z