7mm Backcountry, does BC stand for best choice or bad cartridge? Let's test it!

[reynolds243]

also side note, Yesterday I ordered a 7mmBC 16.5" Evoke rifle and have ammo on the way for 155g, 170g, 175g options.

Will post here what I find personally with that combo. Will be running it suppressed obviously, but will prob be a week or 2 till I get everything, set it up and then go shoot

 

[The Guide]

already does that with the 6.5 PRC. I get 2750 with my 18" suppressed PRC 140g accubonds. slightly higher on the 127 barnes.

If you are doing a 6.5BC it would have to be higher than that to push it over a tried and true 6.5PRC.

I really think that a 6.5BC would have to at 2900 to 3000 fps from a 16" barrel to really get people excited about it. That would put it in the 3100 to 3200 range in a 20" barrel. A 156 Berger at 3100 fps would be nice to see.

Jay

 

[Moby Sculpin]

Tagging in here to see how this pans out. Thank you for doing this!

 

[wind gypsy]

If I had F you money, thays exactly what I'd be doing. Making smaller midsized cases with the peakalloy tech in smaller calibers sizes. I'd even pay some 5 year old to come up with a better name than back country.

6mm Triceratops!

Isn't shellshock making 6.5 creed cases? That sounds like another possible option on the horizon.

 

[UnckleBob]

I really think that a 6.5BC would have to at 2900 to 3000 fps from a 16" barrel to really get people excited about it. That would put it in the 3100 to 3200 range in a 20" barrel. A 156 Berger at 3100 fps would be nice to see.

Jay

I think a 6.5BC would likely generate 2900-3,000fps from a 16" barrel. Those numbers are consistent with what a 277 Fury can do with a 140g class bullet and a 16" barrel. The higher pressure of pressure has a benefit in short barrels.

I doubt a 6.5PRC gets close to those numbers. Furthermore, I would expect it to have lower recoil than a 6.5PRC since it would use less powder to achieve that velocity.

Barrel life would be short.

 

[reynolds243]

I think a 6.5BC would likely generate 2900-3,000fps from a 16" barrel. Those numbers are consistent with what a 277 Fury can do with a 140g class bullet and a 16" barrel. The higher pressure of pressure has a benefit in short barrels.

I doubt a 6.5PRC gets close to those numbers. Furthermore, I would expect it to have lower recoil than a 6.5PRC since it would use less powder to achieve that velocity.

Barrel life would be short.

barrel life has little to do with pressure (hornady talks about this a good bit) and more about powder being burned or not being burned, at least thats what Hornady and Federal claim. SO if thats correct something like a 6.5BC wouldnt really have any less a barrel life then the PRC in theory

Even federal CLAIMS the BC barrel life should be in the same range as a 270 caliber gun.

 

[nm.otter]

I'd bet grains of powder burned relative to bore area.

 

[longrangelead]

I really think that a 6.5BC would have to at 2900 to 3000 fps from a 16" barrel to really get people excited about it. That would put it in the 3100 to 3200 range in a 20" barrel. A 156 Berger at 3100 fps would be nice to see.

Jay

I'm curious about muzzle pressure and how it affects suppression/recoil.
would it be to much to do a brake/suppressor comparison?

 

[Presswood_936]

I'm curious about muzzle pressure and how it affects suppression/recoil.
would it be to much to do a brake/suppressor comparison?

I shot my 16” 7BC along with my buddies 22” lightweight 7 prc . They both have the same cgs Hyperion K silencer . The 16” 7bc was obviously a little louder but the recoil was pretty comparable .

 

[The Guide]

I'm curious about muzzle pressure and how it affects suppression/recoil.
would it be to much to do a brake/suppressor comparison?

The suppressor I'm going to use, SilencerCo Omega 300 DTM, has a brake end cap. I have a brake I could use but I'm not looking to do a ton a different things with this project. I had allocated $1k for the project and I'm well over that right now. When I'm done playing I might sell the project for what I'm into it if someone else is interested in doing a long term test or additional testing.

Jay

 

[reynolds243]

not sure if its allowed to post youtube content here or what BUT this guy did a REreview of the savage 110 Trailhunter lite and got some really good results.
If you didnt see the first one it literally would not eject, he had to beat the bolt with a hammer to get it to finally move. Sent it back to savage and they sent him another gun that they said was verified to be working as intended.

The groups and speeds he got in the 16" barrel are impressive.

The Gear Vault

 

[The Guide]

Should I be concerned for my safety? This is the 2nd rifle this user has had to beat open and this time the case split! Should be interesting to see with mine as it is a 20" barrel and not the 16" he had.

Jay

 

[ChrisAU]

Some people are going to have very disappointing hunts this fall because Federal got cute with pressures and materials. Mostly guys who wanted that extra power and speed for their 75 yard whitetail shots lol.

 

[UnckleBob]

Should I be concerned for my safety? This is the 2nd rifle this user has had to beat open and this time the case split! Should be interesting to see with mine as it is a 20" barrel and not the 16" he had.

Jay

Yea. I don't think I would want to start with a budget Savage.

 

[mattmann]

Hopefully getting my back ordered rings from UM soon and getting a scope mounted on this soon. Started life as a stainless .270 T3 and is now wearing a hells canyon 7BC barrel and peak 44 stock.


Sent from my iPhone using Tapatalk

 

[khuber84]

Started life as a stainless .270 T3 and is now wearing a hells canyon 7BC barrel and peak 44 stock.

7BC on a Tikka........brave man. When/if you rebarrel post 7BC, and use same smith, ask him if there was any lug set back.

 

[reynolds243]

So I finally got around to shooting my CA Evoke 7BC with 16.5" barrel and here is my initial thoughts and info. NOTE I did no break in process, just cleaned the barrel, lubed the internals and went shooting

1st shot was with the 175g Fusion and the bolt got stuck. At this point I was pretty pissed and was about to box it up and send it back to CA. I didnt have to BEAT it open like the savage guy video but it took me a min to get the shell out. Inspected the shell and it had no signs of splitting or pressure issues.

Shot a 2nd shot and the bolt was still not great ejecting but it wasnt stuck. Ended up shooting 4 more fusions and the bolt seemed to get a little better each time. The bolt lift wasnt really heavy it was just at the top of the lock out where it would hang so slightly
Group size wasnt great at around 1.5

Then shot the 170 Terminal ascent for a 3 shot group. Again bolt never stuck but wasnt super smooth either on the ejection.
Group Size again not great at around 1.25

Then shot the 155 Terminal ascent. First shot the bolt hung a little but ejected, next 2 no hang or anything
Group size much better at .88

So I was about to call CA and ship it back due to bolt, already wasnt happy with the accuracy but thought I would try again. Decided to remove action bolts and reinstall them to torque as well as adjusted the trigger down some and then cleaned the barrel.

Went again today and shot 1 group with fusions, 1 with 170 TA and 2 with 155 TA

Bolt seems to be getting better, still not tikka smooth on the first 1/4" of ejection but it ejected all shells fine today. Ive never shot the evoke before this one so maybe the ejection is just kinda like that.
Groups did MUCH better today, not sure if it was the actions screws and/or trigger but all of them. Fusions and 170 TA both under 1" and the 170 came in at .65. 155's however were not as good today with 1 being 1.1" and the other being .9. Could have been me as the issue (im not sharp shooter) but either way as of now Im much more happy with it. I did inspect every brass I fired before and today and NONE showed any signs of pressure, splitting, odd marks or anything.

Velocity on the 155s averaged 3037FPS
Velocity on 170 TA averaged 2897FPS
Chrono died before I shot the fusions but will do more shooting next week and get them all again.

 

[Presswood_936]

So I finally got around to shooting my CA Evoke 7BC with 16.5" barrel and here is my initial thoughts and info. NOTE I did no break in process, just cleaned the barrel, lubed the internals and went shooting

1st shot was with the 175g Fusion and the bolt got stuck. At this point I was pretty pissed and was about to box it up and send it back to CA. I didnt have to BEAT it open like the savage guy video but it took me a min to get the shell out. Inspected the shell and it had no signs of splitting or pressure issues.

Shot a 2nd shot and the bolt was still not great ejecting but it wasnt stuck. Ended up shooting 4 more fusions and the bolt seemed to get a little better each time. The bolt lift wasnt really heavy it was just at the top of the lock out where it would hang so slightly
Group size wasnt great at around 1.5

Then shot the 170 Terminal ascent for a 3 shot group. Again bolt never stuck but wasnt super smooth either on the ejection.
Group Size again not great at around 1.25

Then shot the 155 Terminal ascent. First shot the bolt hung a little but ejected, next 2 no hang or anything
Group size much better at .88

So I was about to call CA and ship it back due to bolt, already wasnt happy with the accuracy but thought I would try again. Decided to remove action bolts and reinstall them to torque as well as adjusted the trigger down some and then cleaned the barrel.

Went again today and shot 1 group with fusions, 1 with 170 TA and 2 with 155 TA

Bolt seems to be getting better, still not tikka smooth on the first 1/4" of ejection but it ejected all shells fine today. Ive never shot the evoke before this one so maybe the ejection is just kinda like that.
Groups did MUCH better today, not sure if it was the actions screws and/or trigger but all of them. Fusions and 170 TA both under 1" and the 170 came in at .65. 155's however were not as good today with 1 being 1.1" and the other being .9. Could have been me as the issue (im not sharp shooter) but either way as of now Im much more happy with it. I did inspect every brass I fired before and today and NONE showed any signs of pressure, splitting, odd marks or anything.

Velocity on the 155s averaged 3037FPS
Velocity on 170 TA averaged 2897FPS
Chrono died before I shot the fusions but will do more shooting next week and get them all again.

Glad it’s doing well . Can you post some pictures of your setup ? I was eyeballing the 16” evoke pretty hard on gunbroker the other day

 

[The Guide]

Now that I have all the ammunition for the testing, I plan on starting with some measurements on the loaded cases. Since this is a factory ammo only option, if the ammunition isn't consistent how can the cartridge be seen as consistent? I figure some basic CBTO, neck diameter, shoulder start diameter, and 0.200 line cartridge base diameter readings should show if there is consistency in the loads.

Jay

 

[reynolds243]

Glad it’s doing well . Can you post some pictures of your setup ? I was eyeballing the 16” evoke pretty hard on gunbroker the other day

only one I had on my phone at the moment. Shooting it with a Tract 4-16x44 and a banish 30.