121gr flatline loading data

[Cody S]

I just got 100 of the WTC 121gr flatline 6.5 bullets in today. Im going to be trying them in my 24" creedmoor over varget with lapua brass.

has anyone tried these in any 6.5 caliber? What was your experience and load data for these bullets.
do they like to be jumped or jammed.

i will update this post this weekend after I experiment and find a load.

i am currently using 139 scenars over 43.4gr h4350 in lapua brass with a 20thousandth jump and a cci 450 primer, in my creedmoor, for 2900fps. Burning it up I know, but it groups unbelievably well (only 5 shot groups but one very small hole) with very low sd/es. I hope to get these to around 3200fps. I am thinking 44gr varget and a 20 thousandths jump should do it.

 

[Marksman10x]

44 grains of Varget seems WAY too high for a 120 grain bullet in 6.5 Creedmoor. Maybe 44 grains of 4350 or something in that burn class. Not to piss on your parade, but that seems like damage your gun too high. I know in 6.5x47, about 39 grains would be max.

other than that, I'm excited to see your results with that bullet.

 

[Jeffvn]

Dan Warner at Warner Tools, he'll give you a solid starting point and powder choice.

Jeffvn

 

[Cody S]

41.5 grains of varget in lapua brass with cci 450 primers and 121grain flatline 20 thousandths off shot about 1 moa.
42 shot like crap
42.5 shot like crap
43 shot like crap
43.5 shot about 1 moa.
im thinking my good nodes are going to be around 41 or 44 grains of varget. I have yet to test either.
i also didnt take my chrono so no speeds as of now.
will test either tomorrow or next weekend more extensively and get some speeds(24" barrel)
testing done at 300 yards

 

[padom]

Didn't Frank test these with 4166 with excellent results?

 

[Black max]

Didn't Frank test these with 4166 with excellent results?

Yes he did. Cody, Google is your friend...

https://www.snipershide.com/flatline...ile-122gr-6-5/

 

[Defender3]

FWIW - QuickLoad reports a 120g Lapua scenar with 44g of Varget @2.800 OAL is pushing 3100fps in a 6.5CM, but it's way over pressure at 71,308PSI! 43.5g is at 65,887 PSI. I understand the flatliners are a different bullet, but you may want to go a bit lower with that varget and work up.

 

[lash]

Defender3 , the flatlines are a solid and as posted a number of times before, Quickload numbers worked up using similar weight conventional bullets do not apply. That's been proven out with numerous Flatline loads in the .308 and .338.

 

[Defender3]

Thanks Lash - I'll do a search and read the threads since QL doesn't have FL numbers. I just got worried seeing those pressures, even though they were Scenars..

 

[lash]

Send an email to Warner Tools. They are usually very good about sharing information and ideas in order to get you started.

 

[Cody S]

I just know what I have seen in field testing. Primers at 43.5 were decently flat (cci450) but I have personally seen worse. At 1.30$ per projectile I am not concerned in the least about brass or barrel life so long as nothing blows up in my face or ruptures. Yes frank tested with varget and imr4166 but he was using hornady brass to my reccollection. The lapua seems to use approx 1 grain less powder for equal speeds. I want to stick with varget because it has shown to be more temp stable. The testing continues, once I find a solid load I will post all my data and some pictures

 

[padom]

I thought he used Prime brass but could be wrong on that..

 

[Cody S]

Ooh I did not know that, that would definitely change some things

 

[V-Ref]

6.5 Creedmoor
24" LRI Amax throat 8 twist
Lapua brass
39.5 H4895
BR4
122 WFL
2.935 COAL
3040, 3031, 3049 fps
No pressure signs on bolt face/primers

That's as fast as I went in that rifle

 

[acourvil]

Defender3 , the flatlines are a solid and as posted a number of times before, Quickload numbers worked up using similar weight conventional bullets do not apply. That's been proven out with numerous Flatline loads in the .308 and .338.

Was pressure measured? Can you point me to the data?

 

[Greg Langelius *]

Honestly. I'm wondering just how many really try to actually measure pressure on this site. I don't have the means and don't have the inclination to purchase the means. Looking at the RSI site, I'm sensing an $850 investment or thereabouts. At age 71, that may not get used long enough for a decent breakeven.

Since I started handloading back in the early 1990's, I've always followed the "start low, work up" mantra, and have tried hard to maintain a good understanding of how to read and heed pressure signs like inspecting the bottoms of fired case, and paying attention to resistance when doing the bolt lift.

Is this safe? Not absolutely. But I still have ten fingers and two relatively functional eyes, and it's not all just luck.

My personal approach to handloading has become to find accuracy and to diligently avoid stiff loads. Barrels last longer that way.

Live long and prosper, Pilgrim..

Greg

 

[lash]

No and no. My statement applies to the proof of use and not scientifically proven.

I can tell you that people are using as much as 98-99 grains of H1000 under 255.5 Flatlines in the .338 LM without pressure signs. A load that would be considered dangerous and likely lock up an action using conventional 250g class bullets.

 

[Cody S]

41 and 44 grains both shot like shit. Right around 1moa, maybe a little more. I am thinking these bullets really do not like varget.
i am giving them up, I shot a 10 shot group of .4" center to center, thats with the flier that I pulled. Without that 10th shot flier it would have been .226" center to center.
that was with 139 scenars 20 thousandths off and 43.4grains of H4350 going st 2891fps average.

 

[NoLegs24]

They shot like garbage in my 6.5x47L using H4350 & Varget. Jumping them 10 through 50 thou off with a load that produce sub 20 ES


Went back to ole faithful Hybrids.....


Sent from my iPhone using Tapatalk

 

[blacknwhite11]

Seems like these didn't pan out all that well