Proof Research is offering 7BC pre-fits for Tikka actions

[MTMeatHunter]

Hold on, wouldn't you still need to change the barrel as a std 6.5 creed chamber is rated to

I have no idea! It seems like if the case is capturing the pressure and no additional force is exerted on the action, why would it? Aren’t proof loads in brass cases over 80k anyway?

Disclaimer. I have a B.A. No clue what I’m talking about, just daydreaming of our Tikka Creeds cut to 18” sending 140s at 2800.

 

[DangerRanger]

Hold on, wouldn't you still need to change the barrel as a std 6.5 creed chamber is rated to 65k?

¯\_(ツ)_/¯ is a proof 7bc barrel any different than a 7prc barrel other than the reamer used?

 

[ckleeves]

I think most WKR’s are running about 80k psi with their reloads in normal brass and it’s no concern lol.

I think a 700 action can hold something like 125k before catastrophic failure. 80k in the BC isn’t really a concern. “Special actions” for the BC is nothing but marketing.

 

[Machingeaneer]

¯\_(ツ)_/¯ is a proof 7bc barrel any different than a 7prc barrel other than the reamer used?

¯\_(ツ)_/¯ these are all great questions

 

[DangerRanger]

Them Sherman magnum boys are going to change the earths rotation once they get ahold of a steel case

 

[4th_point]

Gas leak from 80k psi cartridge in a T3 would be interesting.

 

[pods8 (Rugged Stitching)]

That’s probably the most interesting point I’ve read through all of this. A steel cased 6.5 Creedmoor, without changing anything other than the ammo you buy, zinging 143s at 80k. That will be awesome!

I don't believe SAMMI will endorse the same cartridge for X pressure in brass case and Y pressure in steel case, so I doubt you'd have an endorsed steel case "6.5 creedmoor". Maybe someone will wildcat something but considering making steel rifle cases isn't embraced by the boutique cartridge case makers currently I wouldn't hold your breath for something like that happening anytime soon. Probably would be a better chance of a a new 6.5 based steel case cartridge down the line from federal or such.

That is if this all catches on. Which imho requires additional sources for cases, cases being available as components versus only loaded ammo, and ideally an effective way to resize them. A cartridge that entirely relies on federal ammo as seems pretty limiting in terms of long term adoption.

 

[4th_point]

Some have alluded to more high pressure designs coming - Fury and Backcountry just being the beginning for the consumer. I have not heard anything real solid yet though.

 

[MuleyFever]

That is if this all catches on. Which imho requires additional sources for cases, cases being available as components versus only loaded ammo, and ideally an effective way to resize them. A cartridge that entirely relies on federal ammo as seems pretty limiting in terms of long term adoption.

Why would components be a factor of long term adoption when maybe 3% of shooters reload?

 

[pods8 (Rugged Stitching)]

Why would components be a factor of long term adoption when maybe 3% of shooters reload?

You think its truly that low? Could be, just surprising I guess. Component availability would allow for small loading companies to produce custom ammo with different bullets than federal offers.

Generally speaking cartridges have come and gone while some stayed. Manufacturers chambering in them, ammo availability, and component availability all factor into that dynamic, to what degree each matters I don't honestly know. Maybe even if this cartridge isn't well supported the mere allure of speed make keep it alive regardless. Dunno, just thoughts.

 

[Marshfly]

You think its truly that low? Could be, just surprising I guess. Component availability would allow for small loading companies to produce custom ammo with different bullets than federal offers.

Generally speaking cartridges have come and gone while some stayed. Manufacturers chambering in them, ammo availability, and component availability all factor into that dynamic, to what degree each matters I don't honestly know. Maybe even if this cartridge isn't well supported the mere allure of speed make keep it alive regardless. Dunno, just thoughts.

It might be lower. I don't have a single person that I know of in my group of friends and acquaintances that reloads. Not one. And I grew up hunting so it's a lot of people. For virtually all hunters there is zero juice to squeeze there to make them more effective. Going from 1.25" to 0.75" groups does not make anyone a more effective hunter.

Reloading is simply an additional hobby on top of hunting that you have to make time for. And that's ok. But that's the reality.

The 7BC interests me because I can re-barrel my 270 and get what guys are seeing with 280AI and 270AI reloads out of factory ammo that has no more recoil than what I shoot now. And it will do it with a super short barrel, which I want.

 

[pods8 (Rugged Stitching)]

The 7BC interests me because I can re-barrel my 270 and get what guys are seeing with 280AI and 270AI reloads out of factory ammo that has no more recoil than what I shoot now. And it will do it with a super short barrel, which I want.

Are you assuming slower velocities from a shorter barrel in that thought? If so it makes sense.
If you're thinking heavier 7mm bullets with the speed gains of the 7BC you're gonna have more recoil than the 270win, not necessarily a problem level but if its a heavier bullet going as fast or faster you are gonna have more recoil generally. Technically if the bullet weight and velocity was the same using less power it would be less but I'd imagine a 270win and the 7bc likely will use a similar amount of powder (TBD since I don't know that load data on the 7BC is out at all). Maybe the powder charge is much lower than I'm thinking (fast powder with small charge?), I suppose they could manipulate that potentially.

 

[Marshfly]

Are you assuming slower velocities from a shorter barrel in that thought? If so it makes sense.
If you're thinking heavier 7mm bullets with the speed gains of the 7BC you're gonna have more recoil than the 270win, not necessarily a problem level but if its a heavier bullet going as fast or faster you are gonna have more recoil generally. Technically if the bullet weight and velocity was the same using less power it would be less but I'd imagine a 270win and the 7bc likely will use a similar amount of powder (TBD since I don't know that load data on the 7BC is out at all). Maybe the powder charge is much lower than I'm thinking (fast powder with small charge?), I suppose they could manipulate that potentially.

That's about right on what I'm thinking. All the people that have shot them say very similar recoil to a 270 or 30-06. Add a suppressor and it will be 6.5CM-ish. That's what my suppressed 270 is now which is fine. I have gotten so used to walking around with cut and suppressed rifles that are the same length as a 22-24" gun that I can't go back. haha

I'm really excited to see what happens when they do 6ARC size cartridges.

 

[Shortschaf]

They literally said there is zero additional force on the action. What is force measured in? Units of pressure. Why are you just arguing for no reason? That does not make MORE people want to do business with you...

Force is not measured in units of pressure.

Stress has the same units as pressure though
Stress and pressure are force over area.


I do not seriously believe there is a danger of shearing bolt lugs here
But I do think its fair to ask proof for some words on if this has been tested or thought out (safe)

 

[Styer22]

Well that’s a new development. That wasn’t available when I was looking and almost did a bsf barrel a couple weeks ago.

 

[112Savage]

I am not an engineer but I do have some thoughts and questions.

Everyone is speculating about action stress based on the hoop strength and plasticity under pressure of brass. The steel is supposedly the difference so you can’t think of the stress transferred in the same way.

I would be interested in a brass case version of the 7BC to reload and have cheaper practice at 280AI velocities (which I love) then use/ reload the high psi steel stuff when needed

Most people talking about recoil forget two things. Powder weight factors into recoil, and acceleration factors into recoil velocity. The ft/lbs of recoil may be lower for 7BC but the speed of recoil will likely be higher. For the same barrel length cartridge comparisons

 

[TaperPin]

I don’t buy the idea that there’s no bolt thrust, or that bolt thrust isn’t proportional to the pressure in the cartridge, steel or not. Assuming a steel case will grip the chamber walls is overly optimistic if there is water or a light coat of oil in the chamber.

It wasn’t that long ago when Remington made a 338 Lapua and bolt thrust was causing lug set back, which is mostly a function of how soft the steel is. We will soon find out if lug set back is an issue with a Tikka. Modern actions can take a lot of pressure so I wouldn’t worry about catastrophic failure, but longevity is something time will tell.

 

[Styer22]

Hold on, wouldn't you still need to change the barrel as a std 6.5 creed chamber is rated to 65k?

When I spoke to BSF barrels they hadn’t done it yet but their tech department I spoke to was very confident the tikka action would have zero problem holding up to it and would test it before sending out the barrel.

 

[SloppyJ]

If you cant reload it, who cares?

 

[DangerRanger]

If you cant reload it, who cares?

About 98% of shooters