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!

 

[Nmaybe13]

My Seekins Element 21" suppressed with Hornady factory ELD-X 103 gr. is 2883 from my Labradar.

I wish they still sold/made these.

 

[Grizzle]

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.


Sent from my iPhone using Tapatalk

Hey I'm also in BC and have a rokstock on order. I heard on shoot2hunt unknown has a Canadian distributer now. Hopeing this makes ordering itar items much easier. If so I'll order a barrel, bottom metal and rings soon for the tikka

 

[ljalberta]

Hey I'm also in BC and have a rokstock on order. I heard on shoot2hunt unknown has a Canadian distributer now. Hopeing this makes ordering itar items much easier. If so I'll order a barrel, bottom metal and rings soon for the tikka

Go big tactical. They’re excellent to deal with in my experience.

 

[khuber84]

109 eldm, alpha SAAMI reamer, lapua brass, cci450. 22" Ace 7.5tw 237 bore light palma
Testing 10k, 40k, 50k,60k jump with 41.4gr H4350, velocity for all 12 rounds was 2938-2917. As the jump increased, velocity dropped it a bit. These are 200y groups. So everything was half to sub quarter moa. I know these are only 3 Rd groups. I'm going to do some more testing.

 

[ID_Matt]

109 eldm, alpha SAAMI reamer, lapua brass, cci450. 22" Ace 7.5tw 237 bore light palma
Testing 10k, 40k, 50k,60k jump with 41.4gr H4350, velocity for all 12 rounds was 2938-2917. As the jump increased, velocity dropped it a bit. These are 200y groups. So everything was half to sub quarter moa. I know these are only 3 Rd groups. I'm going to do some more testing.
View attachment 730158

Only 3 round groups, BUT your 12 round aggregate is probably under half, i wouldn’t do any more testing! Pick one and shoot. Got a good barrel

 

[khuber84]

Only 3 round groups, BUT your 12 round aggregate is probably under half, i wouldn’t do any more testing! Pick one and shoot. Got a good barrel

Agreed. There is less than 50 rounds on this at the moment, so it'll speed up for a while. My first Ace, so kinda unknown. So far this barrel likes the 109 and 112mb but that's all I've tested. I'd like to think with these 106tap I have and see what they do.

 

[goalie]

Factory Hornady 108's average was 2976 for 20 shots out of my RPR today

 

[goalie]

 

[B_Reynolds_AK]

Def doable. I run 105s at 2950 from an 18", 95tmk at 3080. I wish I could get some more of the 95s! I am having a new ace 237 bore 4gr 7.5tw barrel spun at 22" tho with an alpha SAAMI spec reamer and plan to run 112mb at 2950-3050 in that rig.

My new PVA throated 18” 7 tw. bbl is getting a load developed right now.

120 rounds (110 factory Hornady to break it in) in and I’m getting 2960 fps with 112 MB’s, H4350 and Alpha OCD brass.

Barrel was only cleaned when received, before first round fired, and has never been fired without a Scythe-Ti attached.