I just love it when you read a new thread to find it took a hard turn and the conversation went another direction. So, humor me. What are titles and OP questions for?
To the OP. You are on a good track. I have years of extensive first hand experience with the 338 Lapua. It does not cost any more to feed a 338 Lapua than it does to feed any other 338 of the same, or similar performance level. In fact, it actually can cost less. Yes the brass is over $2.75 ea. But to get brass to last as long in a 338 EDGE you will be looking at Bertram and that is $3 plus each. If you want the same performance from other offerings in less expensive brass expect to replace it 2 to 3 times over the Lapua brass. I have 338 Lapua brass with over 15 firings with full house 300 gr loads that is still going. So the "Cost more" speech holds zero water to me.
Here is my review on the CA ELR in 338 Lapua that we hunted with in high country all last season and took many elk with.
Full Review of the Christensen Arms ELR Rifle by Jeff Brozovich - Long Range Only
As for recoil, here is a video of my 5'2" wife, shooting her elk at 688 yards and she sees the bullet go through the elk through the scope. Keep in mind this is the very first time she has ever pulled the trigger on this rifle. Note the wind in this video. This is exactly why we shoot a 338 instead of something smaller with more wind drift. X rings to the vitals make for a great day and dead elk.
Diane Brozovich's 2016 ELK Hunt Video with the Christensen Arms ELR - Long Range Only
Here is a picture of my 58 yr old broken up ass 5 miles up in the Montana mountains carrying the ELR in my back pack scabbard. The rifle is a great weight when coupled with a 2lb optic for a balance between accuracy and recoil in a packable 338. The slayer brake is also awesome. And yes, we brought an elk out we took across the canyon.
As for your optic choice, I question the use of a FFP? If you were going to shoot Matches like PRS with this rifle then yes, maybe a FFP. But if what you are going to do resembles what we do, then dont fall for the FFP hype. In my world I can do everything and more with my SFP scopes as you would be able to do with a FFP. In fact, I have both almost all the time on hand, and none of my long range hunting rifles wear a FFP. With that, I will offer you look at the tried and true Nightforce NXS in .25 MOA with the MOAR reticle. Or, if you want to stretch a bit farther look at the 5~25 SFP Nightforce ATACR. The ATACR is what we ran on the ELR all season on many elk hunts.
Here are just a few pics from young hunters, gals you name it, of game taken with the ELR in 338 LM in one season.
I hope the OP finds some of this post useful. If you have questions I will try to answer them with what I know from my experience with both the 338 Lapua magnum, and optics mentioned.
Jeff