Want To Buy Left Hand Long Action Magnum Action that is Pre-fit supported

I am thinking of having a rifle built & I am wrestling with which direction to go. I'd like the forum's advice.
The chambering will probably be either 7PRC, (70% chance), or 300 PRC,(30% chance.) I am invested in both already & Hornady has not rolled out the .338 PRC yet so it's either 7 or 30 cal.

I have a suppressor & will shoot this rifle suppressed 99% of the time. Never is an absolute, & things tend to happen, but I do not intend to shoot unsuppressed.

Requirements-
1. Left hand
2. Long Action, MBF
3. Uses Pre-fits that are common.

I already have an AG Composites stock on hand & have been studying on the following actions: all are LA, LH, MBF

1. Kelbly Prometheus/ Nanook
2. Terminus Zeus
3. Bighorn TL3
4. ARC Coup De Grace
5. Impact 777/ NBK
6. Kelbly Atlas

Hunting rifle primarily with fair amount of range usage.

Which action would you go with?
Why?
What other actions did I overlook?
What trigger?

Thank You In Advance

Impact all day. Everyone makes barrels for them. They have a trigger hanger. Super smooth. Bolt is smooth on bottom for smooth feeding.

nwmnbowhunter said:

Impact all day. Everyone makes barrels for them. They have a trigger hanger. Super smooth. Bolt is smooth on bottom for smooth feeding.

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Finding one of those in LH is proving a challenge.

Go with the Kelbly but use the Nanook instead. The Prometheus is HEAVY!!!

hseII said:

Finding one of those in LH is proving a challenge.

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Call altus

806 guns said:

https://preferredbarrelblanks.com/product/kelbly-atlas-lite-action/

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Kelbly are great, but the mechanical ejector is not for everyone

nwmnbowhunter said:

Kelbly are great, but the mechanical ejector is not for everyone

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Not sure what is "not for everyone". Nothing has ever failed, jammed, or anything on any of the 12 I own. Aren't all ejectors "Mechanical"?

JAYgs8163 said:

Not sure what is "not for everyone". Nothing has ever failed, jammed, or anything on any of the 12 I own. Aren't all ejectors "Mechanical"?

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Mechanical vs spring/ plunger.

They just have a little different feel is all.

Do you want the case to fly out on its own or do you want to control how far it flies? Haha

If I was buying a new long action for hunting it would either be an Impact NBK or a Lone Peak Fuzion alpine cut rail. Altus has a lefty LA mag BF in stock right now.

Someone had a Terminus Zeus LH LA posted FS on here or the Hide & I cannot find the add.

I like rehoming lightly used Actions also.