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Xero C1 Pro - v3.30 update

I have only responded to you in the same tone you have to me. I asked Garmin to add a much-needed feature and you felt the need to step in and say it isn't needed. I figured you were one who based your performance off of 5-shot strings. Now you have confirmed it and that makes sense - you haven't learned the reality of it yet.

I'm not "picking a fight", you called me out and I responded. I'm not calling you names, but you are to me. Your "workaround" is cumbersome and pointless when the company could easily provide the solution within the unit itself. I am not surprised by the rest of your response, because it is exactly what I expected it to devolve in to from your first response. You do not like people speaking to you in the same tone you do to them. Virtually everything I've said to you is just a mirror image of your response to me (minus the name-calling).

And again, I find it strange why anyone would fight against the idea of adding a useful feature to the unit that must be well within its capabilities.
"fighting against the idea the idea of a useful feature" is a figment of your imagination. In fact today I figured out a way to provide feedback to directly Garmin through their website Garmin.com. I made two enhancement suggestion, one of which I made on your behalf. And your welcome.
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Defiance or American Rifle Company

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?

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.
Gross conceptual error

Accuracy International Picture Thread

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.
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).