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.

Click to expand...

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.

Click to expand...

Call altus

806 guns said:

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

Click to expand...

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

nwmnbowhunter said:

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

Click to expand...

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"?

Click to expand...

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.