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

[Jaegerr]

I was doing some research in to some different calibers and one of them was the new 7BC that was released at shot show this year. When I was looking into what actions were considered sufficient for the higher pressures, even though it's my understanding the chamber holds most of that pressure, I got curious if any manufacturers were offering pre-fits for tikkas in the new calibers. It would seem Proof Research feels like a tikka action is sufficient to hold that pressure in one of its carbon barrels. Here is the link https://proofresearch.com/barrels/tikka-pre-fit/

I thought this might be an interesting topic as my professional thought process is that I don't foresee all of these companies adjusting manufacturing and adding cost to a receiver for one cartridge. That feels like a large undertaking for someone like savage for example who produces a lot of rifles to have a manufacturing line, dies, machinery, etc just for one new cartridge. I could be wrong, but I'd love to hear from individuals more knowledgeable about me when it comes to manufacturing specifically, even the engineering to an extend.

 

[pods8 (Rugged Stitching)]

Does proof have it in writing Tikka approved using their action for that pressure/cartridge and if not is proof accepting liability if the Tikka action fails, including any injuries?

If not that would tell me all I wanted to know.

 

[Jaegerr]

Does proof have it in writing Tikka approved using their action for that pressure/cartridge and if not is proof accepting liability if the Tikka action fails, including any injuries?

If not that would tell me all I wanted to know.

Great question. I'd cautiously assume if they are confident enough to actively list the option, they'd be comfortable to stand behind it. Whether they're comfortable to put their face behind it might be another story lol

 

[pods8 (Rugged Stitching)]

Great question. I'd cautiously assume if they are confident enough to actively list the option, they'd be comfortable to stand behind it. Whether they're comfortable to put their face behind it might be another story lol

Will they be comfortable to put IN WRITING that either Tikka approved it or they, proof, accept all associated liability? That’s the question you should be asking them vs forum assumptions about a new high pressure cartridge chambering.

 

[MuleyFever]

There are numerous rifles chambered in the 7BC. Are we assuming that they all tooled up for a new action? I would bet not. CA is chambering this round. I dont think they made a new action for it.

 

[goathunter]

Right doesn't the steel case handle the extra pressure, not the action?

 

[mustelid_master]

I'm not a gunsmith, but I'd imagine that most of the pressure is contained in the chamber area of the barrel, something that proof can control.

 

[Turkeygetpwnd38]

Crank that barrel onto a tikka action, throw in a reduced weight trigger spring, screw a scythe on the end, mount a leupy and hand it to your kid/wife. They’ll be good to 1000 yards guaranteed!

 

[pods8 (Rugged Stitching)]

If it’s no sweat than a written statement of acceptance of liability for its suitability in a given action.

Or maybe have them install the barrel and fire some proof loads in it. They should be willing to replace a damaged action from a proof load if they are confident.

 

[Jaegerr]

Will they be comfortable to put IN WRITING that either Tikka approved it or they, proof, accept all associated liability? That’s the question you should be asking them vs forum assumptions about a new high pressure cartridge chambering.

I agree. I felt with it being a new cartridge it might be an interesting topic to discuss. I'll send an email to proof and follow up with what I find out in this thread.

 

[Jaegerr]

There are numerous rifles chambered in the 7BC. Are we assuming that they all tooled up for a new action? I would bet not. CA is chambering this round. I dont think they made a new action for it.

This was more of my thought process regarding it all.

 

[Jaegerr]

I

If it’s no sweat than a written statement of acceptance of liability for its suitability in a given action.

Or maybe have them install the barrel and fire some proof loads in it. They should be willing to replace a damaged action from a proof load if they are confident.

Inquiry has been sent to proof specifically for proof barrels in traditional Tikka T3X actions. Now we wait...

 

[MuleyFever]

This was more of my thought process regarding it all.

I see Savage has it in 5 different 110 models, including the ultralite. I doubt they made a new action for it. Seems like the pressure is handled by the case and chamber and the action doesn't really matter.

 

[wind gypsy]

It seems like the main concern with higher pressure is if the brass can contain it and how much bolt thrust occurs with the increased pressure. My impression is that there is a lot of reliance on these newer cases gripping chamber walls enough such that there is not substantially increased bolt thrust on the action?

 

[Marshfly]

Where are people getting this idea that the 7BC puts more pressure into an action? I can find literally nothing definitive that says that. It's all forum conjecture and fear mongering.

 

[Jaegerr]

It seems like the main concern with higher pressure is if the brass can contain it and how much bolt thrust occurs with the increased pressure. My impression is that there is a lot of reliance on these newer cases gripping chamber walls enough such that there is not substantially increased bolt thrust on the action?

I specifically asked a question in regards to bolt thrust. I had mentioned in my message that in traditional brass cases, overpressure would cause heavy or stuck bolts from case stretch. If the case fails, is the bolt locking surface sufficient to hold the pressure? (I honestly have no idea whether a typical cartridge in a case failure situation can hold the pressure at 65k psi for a PRC cartridge for example, so that may be a moot point based off my lack of knowledge on the subject)

 

[pods8 (Rugged Stitching)]

I see Savage has it in 5 different 110 models, including the ultralite. I doubt they made a new action for it. Seems like the pressure is handled by the case and chamber and the action doesn't really matter.

Other manufacturers have said they either need to investigate or design a new action, perhaps just being conservative but something running 20+% higher pressure than prior cartridges I wouldn’t want to go with a hunch.

But then again I have zero interest in a cartridge that is currently not reloadable.

 

[pods8 (Rugged Stitching)]

Where are people getting this idea that the 7BC puts more pressure into an action? I can find literally nothing definitive that says that. It's all forum conjecture and fear mongering.

The case runs at a higher pressure. 80000psi. What forces are exerted on the barrel and action from the steel case is the question. One I personally wouldn’t just assume is good to go versus the manufacturer of the action confirming it. Wanting clear info isn’t fear mongering.

 

[Jaegerr]

We have an answer. Below is the official response from one of proofs sales managers directly copied from the email I received, outside of coping my name into it.

"Thanks for reaching out. We engineered this barrel and thoroughly tested it and there are no issues with safety shooting this cartridge in the T3x action. We also had independent testing facilities Xray and test the barrels and everything is fine. There is no additional stress on the actions as the steel case and barrel chamber contain the pressures.



Sincerely,



Andy Eff / Int’l & Central US Sales Manager

PROOF Research

10 Western Village Lane

Columbia Falls, Montana 59912

o: 1.406.756.9290"

 

[pods8 (Rugged Stitching)]

There ya go. That’d be valid in a lawsuit of the action fails so they seem confident.


Step 2 is if someone can figure out how to resize the steel case effectively/reliably for reloading it.