6 CM & 108 ELD Velocity - Barrel Length

[Sykes]

24" Bartlien Carbon #4 7 twist
105 bergers 3000 fps
ADG brass and H4350

 

[Timjohnson11]

Has anyone shot the Unknown Munitions 6mm 108 ELD-M? Curious how much velocity increase one should expect there over a standard box of ELD-M from Hornady?

 

[SloppyJ]

I have an 18" xcaliber carbon coming for my 6CM build. I'll be happy with 2850 for 108s. I plan to try tye ELDMs, Bergers, and the 95gr NBT.

I appreciate everyone's feedback here. I initially wanted 3kfps and was leaning towards a custom throated 243ai but the brass availability of 6CM and no fire forming won me over. In the end, the short barrel was most important so I stuck with that.

Like someone else said, it takes discipline to stick to your plan when building a gun. I comtemplated going to a 20 or 22" barrel but luckily talked myself out of it. This gun was a specific build for thick southern woods whitetails. I'll be lucky to see a 200yd shot.

 

[FullyTorqued]

Has anyone shot the Unknown Munitions 6mm 108 ELD-M? Curious how much velocity increase one should expect there over a standard box of ELD-M from Hornady?

I haven’t tried the UM, but I did order 500 of the GAP 109 ELDMs. According to Form they act just like other ELDMs terminally on game, but have a better BC since they are basically A-Tips with polymer instead of aluminum tips.

 

[justin davis]

Has anyone shot the Unknown Munitions 6mm 108 ELD-M? Curious how much velocity increase one should expect there over a standard box of ELD-M from Hornady?

I have some of that. I chronographed both factory and the UM. The factory Hornady shoots average 2952. And the UM is 3133. This is out of a 24 inch barrel

 

[khuber84]

3050 was gonna be my guess, that's the middle node where I run a few my 6cm. This is a screenshot from the UM website.

 

[J_Jacobson196]

How did this turn out for you? I’m in your neighboring province and was looking a similar direction for the next rifle build. I couldn’t find a reasonable way to get a rifle up here from unknown, so I bought the rokstock and they’re shipping it up for a flat $50.

Thinking 22” ibi barrel, Ti3 action, trigger tech diamond and m5 hunter dbm. Should be a good sheep / md rig.


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If it's any help to you. I just had a Howa 1500 6cm built with a 22" IBI Med Hunter Profile. .120FB to run the 112gr Match Burner.
Fireforming 6cmLRP ADG Brass, I'm right on 2846fps with 39.0gr of AR2209 and REM 7 1/2 Primers. Groups were excellent. I have no regrets about going to 22".

 

[Glockster26]

REM 700
20 inch Bartlein 3B w/harvester evo
Factory 108 Eld-m 2826 fps chrono and drop verified at 600

Factory Hornady black 105 bthp 2880 fps drop calculated at 600

108 Berger EH 40gr H4350 2915 chrono and drop verified at 600

105 Berger HT 40gr H4350 2934 chrono and drop verified

The Berger 105 and 108 shoot to same point of aim and mill adjustments are the same at distances I shoot at.

 

[sickles107]

20" pbb, 7.5 twist, 6 cm

Srp lapua, 40gr h4350, 108 eldm, trues out to ~2900 fps

Right around 2050fps at 600yds

 

[sturner88]

Hornady 108 ELDm Factory Ammo

20" Bergara W/Nomad TI--2920 FPS
16.5" Proof W/Harvester EVO--2800FPS

 

[khuber84]

My 22" ruger predator with ultra7 is 2850fps but shoots surprisingly well!