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+--- Thread: X-Caliber 6mmAR (/showthread.php?tid=20143)
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X-Caliber 6mmAR - Herzo - 12-10-2019
Fed-ex came by with a surprise yesterday, 28" 6mm AR 1:7 barrel about 3 weeks before I expected it. Bought an RCA bolt along with it. Gas port is at rifle +2". Assembled it to a Davidson Defense upper using a 14.6" White Oak Armament forend and a Superlative Firearms AGB. Topped it off with a Vortex Viper HST 6 - 24x using a 20 MOA Warne mount. Probably the easiest build I've done. Fit between the upper and barrel was line to line - just a light tap with a rubber mallet.
Will finish it off with an Anderson lower, Larue trigger and a Magpul MOE for now.
Will be trying 110 gr Sierra MK's @ 2.390" ahead of Alliant Reloder 17 if the weather breaks.
X-Caliber 6mmAR - LtDan - 12-10-2019
What date did you order yours?
X-Caliber 6mmAR - Herzo - 12-10-2019
Oct 30
X-Caliber 6mmAR - LtDan - 12-12-2019
I just got mine yesterday afternoon
X-Caliber 6mmAR - Herzo - 12-12-2019
Details?
X-Caliber 6mmAR - LtDan - 12-13-2019
Herzo Wrote:Details?
24" Bull, 11 degree crown 5r 1n8
X-Caliber 6mmAR - LtDan - 12-19-2019
Put 20 rounds in it yesterday, shoot one, clean it , shoot one, clean it and so on. Finally got the scope to put it where I wanted it and here is shots 18,19,20
[ATTACH=CONFIG]15110[/ATTACH]
X-Caliber 6mmAR - mopar_4life - 12-20-2019
How did the 110 SMK shoot? I?m building one and Was considering the 110. I don?t think they will be mag length and I?m not gonna single feed.
X-Caliber 6mmAR - Herzo - 12-20-2019
Weather and family obligations have conspired to limit my range time. I managed to run the break-in protocol, but serious load development will have to wait til after the new year.
X-Caliber 6mmAR - LtDan - 12-20-2019
LtDan Wrote:Put 20 rounds in it yesterday, shoot one, clean it , shoot one, clean it and so on. Finally got the scope to put it where I wanted it and here is shots 18,19,20
[ATTACH=CONFIG]15110[/ATTACH]
This was 105 Berger Hybrids, 27.5 gr of RL15 single loaded, Whitley says not to go too heavy, 110 are too long to heavy for the 6 Grendel, just saying. I wanted to try 95 SMK but no one has any stock of them where I shop.
X-Caliber 6mmAR - Herzo - 12-21-2019
Spent a little range time this morning, ran 40 rounds of 107 SMK at magazine length using CFE223, IMR4320 & 8208 at 100 yards. None of the loads showed any signs of pressure. Most were approaching or just over 2600 fps & all were 1 MOA or better. One CFE load produced a 3 round cloverleaf with 2 more opening up to just under 1". I believe that the barrel needs a few more rounds through it before it settles in - I only have 75 through it at this point.
X-Caliber 6mmAR - Herzo - 12-26-2019
Put another 80 rounds through the rifle at 100 yards this morning. Working with CFE223 behind a 105 Nosler RDF & 110 SMK. RDF produced a sub 5/8" 5 shot group @ 2730 fps, while I was approaching 3/4" with the SMK @ 2600 fps. Both were touching the lands. I feel like I'm getting close to a 1000 yard load.
X-Caliber 6mmAR - soloelcap - 12-27-2019
The 110 Match Kings are too long and heavy for 6AR. The Berger 105's work great in longer barrels. The 95's are meant for 6AR, try some H4895 or 8208 and CCI 450's. The 95's have no problem at 600yrds and will go to 1000 yrds.
X-Caliber 6mmAR - Herzo - 01-07-2020
I think I've found a 1000 yard load. Now at 210 rounds through the barrel. Produced a sub 3/8" group with a 107 grain SMK at 0.010" off the lands and ahead of a generous amount of Reloder 17 at 2760 fps.
X-Caliber 6mmAR - BluntForceTrauma - 01-08-2020
Great stuff. Thanks for reports!
X-Caliber 6mmAR - Highbrow - 01-08-2020
How is the ejection pattern with Reloder 17? That is a fairly slow powder for the 6AR. I use Varget and have a hard time getting enough in the case.
X-Caliber 6mmAR - Herzo - 01-08-2020
Throwing fairly gently @ 4 o'clock. I arbitrarily set the Superlative gas block at about 50 percent and have had no reason to adjust it. Varget does not seem to be appropriate for the 6mm, but for some reason the substantially slower Reloder 17 seems to be giving me good velocities. I suspect that it performs better in the longer barrel.
X-Caliber 6mmAR - Herzo - 01-08-2020
I did a quick comparison of RL17 & Varget on QuickLoad. Results are interesting. RL17 is ~13 percent denser than Varget & has 11.5 percent more energy by weight. It also is running nearly 15 percent higher pressure when the bullet exits the barrel. Explains a lot.
X-Caliber 6mmAR - mopar_4life - 01-09-2020
How does RL 17/ Varget compare to RL 16?
X-Caliber 6mmAR - mopar_4life - 01-09-2020
I?m curious to see how QL sees it