How much do benchmark barrels speed up

[LC 6.5 Shooter]

Just started shooting my new 6xc today. Virgin alpha brass. Br-2 primer. 39.0g H4350. 105 berger hybrid. Speed was pretty erratic, probably new brass. Velocity was 2880-2915. Load was warm, but not max however wanting to run 3050f/s. Theres a little room to go up on charge. Wondering how much the benchmark will speed up. How much has yall sped up and usually how many rounds down the tube.

 

[Primus]

Every barrel is different it's like playing the lottery.

Want to increase your odds? Buy a top barrel and have it chambered by a top Smith.

 

[LC 6.5 Shooter]

Very good smith in Houston chambered it. Is benchmark not a top barrel? I thought it was a good one.

 

[264win]

Benchmark barrels are top notch. Get a few more rounds down your barrel and I bet you will pick up some speed.

 

[shotdown]

I’m running a 6XC Benchmark Barrel. I started off around 3024 fps with a 105 and ended up at 3049 fps. I am also at 40.4 gr H4350 using Alpha SRP and CCI40.

 

[SupressYourself]

My 6.5 creed Benchmark sped up over 100 fps over the first 200 rounds.

 

[Bigwheels]

My Benchmark is still speeding up @ 1000 rnds. Increase in the last 300 or so was about 20 fps.
300 WM 1-9.5 twist. 28"

 

[Clint E.]

I just broke in a 6 creed benchmark and after about 150 rounds I gained 90 fps.

 

[arm017]

What is your barrel length? 2900 is on the slow side for a 105 hybrid in a 6XC.

 

[LC 6.5 Shooter]

What is your barrel length? 2900 is on the slow side for a 105 hybrid in a 6XC.

25.5”

 

[LC 6.5 Shooter]

I’m running a 6XC Benchmark Barrel. I started off around 3024 fps with a 105 and ended up at 3049 fps. I am also at 40.4 gr H4350 using Alpha SRP and CCI40.

Ive read the 105’s really like being pushed at 3050f/s. Hoping to get there.

 

[arm017]

I have found 6 mm barrels to speed much more as compared to 6.5 mm barrels. I would say maybe 100 fps on average from midsize 6 mm cartridges i have ran.

 

[LC 6.5 Shooter]

What is your barrel length? 2900 is on the slow side for a 105 hybrid in a 6XC.

Also not pushing it extremely hard yet. Just shot first 27 rounds today. Still some room to push them but not a bunch. Was hoping barrel settling in will donthe trick.

 

[LC 6.5 Shooter]

I have found 6 mm barrels to speed much more as compared to 6.5 mm barrels. I would say maybe 100 fps on average from midsize 6 mm cartridges i have ran.

That would get me close plus Ive got a little room to go up on charge weight.

 

[LC 6.5 Shooter]

I’m running a 6XC Benchmark Barrel. I started off around 3024 fps with a 105 and ended up at 3049 fps. I am also at 40.4 gr H4350 using Alpha SRP and CCI40.

Did you start with new alpha brass? I didn’t do any prep. Just primer and loaded 39.0 g. Had pretty high sd/es. Did you notice higj es/sd with your alpha brass

 

[arm017]

You should have a bunch more room to push...

I would recommend not doing load devo on a 6 mm barrel with less than 200 rounds or with virgin brass.

 

[LC 6.5 Shooter]

Yeah I wasn’t planning on doing load development until I fired my 300 rounds of virgin brass. Just running 39.0g h4350 until I get all the brass fired once. Then tweak load. Only thing it seems like after 300 rounds Ill be almost a quarter through the barrel life. Would you fire all 300 cases once. I was thinking of just doing 200 then doing load development. Save the other 100 for the next barrel.

 

[arm017]

Yeah I wasn’t planning on doing load development until I fired my 300 rounds of virgin brass. Just running 39.0g h4350 until I get all the brass fired once. Then tweak load. Only thing it seems like after 300 rounds Ill be almost a quarter through the barrel life. Would you fire all 300 cases once. I was thinking of just doing 200 then doing load development. Save the other 100 for the next barrel.

yeah something like that - or even just loading those other 100 once you kind of have an idea of where you load is with brass that is going to be sized based on your chamber.

 

[shotdown]

Did you start with new alpha brass? I didn’t do any prep. Just primer and loaded 39.0 g. Had pretty high sd/es. Did you notice higj es/sd with your alpha brass

Yes, I used virgin brass. I did not see a high SD but I did run an expander mandrel through the neck before loading them. I noticed that they have a lot of neck tension when new.

 

[LC 6.5 Shooter]

Yes, I used virgin brass. I did not see a high SD but I did run an expander mandrel through the neck before loading them. I noticed that they have a lot of neck tension when new.

I ran my remaining unloaded virgin brass through the 6xcII redding type s die (just the neck) with a floating nitride expander ball to hopefully help make neck tension more consistent. Not really chasing load development yet but your way made me think about going ahead and doing it.

 

[wvlapua]

For reference..
26" 6xcII
Rock Creek button
115 naked DTAC.
39.0 H4350
Norma brass..virgin
Avg. 2937 fps after 100 rounds. Initially it was 2901.

 

[SharpsNitro]

I don’t have the numbers recorded but my 6.5SAUM Benchmark sped up about 100fps. My 243 Benchmark didn’t speed up quite that much.

 

[LC 6.5 Shooter]

Just wanting to get to 3050f/s. Im gonna try some rl16 I have during this break in period and firing virgin brass

 

[SharpsNitro]

Not sure I can help you there. I’m shooting the 115gr DTAC at 2927fps and it’s been a hammer when fire forming the Winchester brass (shooting the 243 Imp30). Accuracy seems to be the same with fire formed brass. I’m using H1000.