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Defiance or American Rifle Company

S
The only issue I have with the CDG is, as mentioned above multiple times, the trigger hanger. Milling out the slot is easy, but getting the trigger you want to work in the hanger can be a pain - unless you’re using a Trigger Tech.

Calvin Elite - required a bit of milling on the hanger to make the safety work properly.

Elf trigger - will require hanger milling as well, definitely not a drop in fit.

I love ARC actions, but really don’t like the trigger hanger not working easily with my triggers…..

Gen 2 Nucleus is a fantastic option as well, plus NO trigger hanger!!!

Good luck!!
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MOA comeback?

308pirate
jpjulian said:
I would think if you are shooting a 'target game' vs an 'action game' you would want MOA because of the known distance ranges, ie: 200, 300, 600, 800, 900, 1,000 yards typically shot in known distance target matches. You just don't see MIL scopes in those games. PRS and other action or unknown distance situations would be where MOA may be at a disadvantage and MIL preferred. Although I don't compete any longer, and never in PRS or NRL, my most recent rifles have MIL scopes, just because.
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Gross conceptual error
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Accuracy International Picture Thread

beetroot
HKSniper11B said:
Again, it isn't just about the bullet weight, but the bullet length as well that matters.

Plenty of folks ran the M40, M40A1, M40A3 and M40A5 out past 1000 yards just fine, which has a 1:12 twist barrel, and ran M118LR rounds, essentially Federal GMM SMK 175gr. I did reach out to a sniper instructor peer who has combat experience with the M40 rifles, who confirmed the distance and capability for me.

We also have @FUNCTIONAL with very direct experience running the M40. Sorry to call you out but it's important. Hell I want to share more of that shot data just as a solid reference...

There's no reason why the 1:12 Lothar Walther barrels aren't extremely capable. But, the right round needs to be chosen for it.

And so this circles right back to why I made my original post sharing the shot group: the Sierra 168gr TMK round with it's improved 9° boat tail seems to work best in this barrel, which I've so far tested in 20", and I have no doubt will perform equally well in my 24". My next range day I hope to get 300 round shot groups, and later, 700 round shot groups depending on wind.

I'll share all the images and data I have on this round. For us Yankees, the Federal GMM SMK 168gr & 175gr, and the Federal LE T308T 168gr, seem to be the most effective and cost conscious round to use in these barrels.

I don't have experience with Lapua or Berger rounds in these calibers, so I leave it to others to comment on what else shoots well. I invite it as this data is important for folks like us to have.

And yes, I read every single post in this forum regarding the Arctic Warfare and AT308 looking for ballistic data of factory rounds, and found excruciatingly little.

I hope the attached data helps for context. And I have much more data that shows how the length of Hornady rounds do not stabilize. I also tried the stability factor with a Berger 185gr round without success, but I'd entertain actually shooting it to see how it performs.
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So I run the numbers for more projectiles and other barrel twists, I do know that bullet weight isn't really the issue it's length/bearing surface/ogive that all goes into, probably safe to say that high BC bullets need a faster twist.

The outcome is the same as before, other than SMKs (older bullet design, shorter, low BC*) a 1:12 is not a brilliant choice, especially if it's a short barrel. 1:11 is definitely better but still suffers with some of the very heavy/high BC bullets, and a 1:10 is basically good for anything.

It's worth point out that only the Berger Hybrids are actually unstable in the 1:12, everything else on orange is just marginally stable.
The biggest take away from this whole thing is how amazing the newer SMK designs are 169gr/200gr (also the 131gr .25cal, 130gr and 150gr 6.5mm) these things have massively improved BCs over the old SMK design, often have a higher BC than the same weight TMK yet are shorter and likely more forgiving on seating depth.

308 stability.png


I know I could've stream lined this table even more, but it is was it is.

Orange is marginal stability 1.0-1.5.
Red is unstable <1.0
Greyed out means fully stable (because the twist above (slower) was 100% stable at all speeds no point running the numbers at a tighter twist).
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223/for distance

beetroot
Bevan said:
Aside from the difficulty of getting consistent velocities with .223, and the lower impact signature, the 88s or 85.5s should be in the ballpark of being reasonably competitive with the 6mms, with some serious advantages in recoil & cost. I'll probably try a barrel set up for 88s when my current 6GT barrel dies
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I had planned (even ordered the barrel black) to shoot 223AI for open class, but project never ended up happening.

With a 26"+ barrel 88s ate 2800fps should be pretty easy to achieve, which puts you in 6BR ballistic territory., not sure a vanilla 223 would get much more than 2700sfp without an exotic powder though.
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The Greatest Archaeological and Technological Discovery of Mankind

LRRPF52
The 1800s had all kinds of interesting claims about the Pyramids and Sphinx, including hidden chambers, halls, records, shafts, secret entrances, etc.

The Brits and Muslims were very interested in these ideas, hence the level of excavation and exploration finances by various universities.

I don’t subscribe to any of the New Age claims about the Pyramids made famous by the Rosicrucians and Ed Cayce, but I don’t rule out what others deem impossible or unlikely.
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A&D Fx120i Scale

S
I use a RCBS MatchMaster and have been happy with it. I have read a lot about the A&D Fx-120I scale and wondered how my MatchMaster would compare. So I decided to order one and see for myself. The scale seems to be a well made, quality piece of equipment. I warmed up and calibrated both units. I dropped powder for 30 rounds of 300 WM with 70g of RE22 then weighed on the A&D. I had 7 rounds that read .02g lighter and 1 that was .02 heavier on the A&D. The rest were an exact match. Since each kernel weighs approx .04g, In the end it made no difference in what I was already doing. Maybe I just got lucky with 1 use but we will see what happens over time.
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