Probably just the angle of the shot and lighting, but it looks like the area to right/bottom of the rear pillar might be proud of the pillar? The rear pillar needs to be flush or slightly proud of the glass around it.
Proud? Sorry, I'm not sure if that's a typo or a term I'm not familiar with. I'm happy to photo a different angle.
At this point, Fierce has accuracy tested the rifle and it's met their requirement. I would recommend you first, grab a box of the factory ammo used for their testing and see if you can duplicate the results at the target. I'll add one more very important point, because we know nothing about you or your shooting skills... do you have the experience/ skills to shoot a lightweight magnum like this accurately? Not a dig by any means, but it's a fact that some shooters are recoil sensitive- and shooting cloverleafs with a 6 lb., .300 WM is a tall order. If this is your first lightweight magnum, might have someone else with that experience drive it to see if their results differ.
Not trying to dissuade you (well, as a smith- maybe a bit)- but unless this is your only rifle, get your first experience bedding something else before tackling a $4K rifle. If it were a rifle of unknown accuracy (unfired by the builder), it would merit a lot more investigation, beginning with borescoping the barrel/chambering. But, you've got a well known builder that's accuracy tested the rifle- and unless you think they're faking the targets- believe the target you're looking at. It's most likely not a problem with the rifle, more likely your handloads and trying to find the sweet spot...JMO
I did just that. I grabbed matching factory ammo and was able to sufficiently meet their accuracy benchmark (.56" @100 yds in moderate wind). So I trust their results, I'm just hoping to get the same results with 200gr+ bullets.
It doesn't bother me to ask about my capabilities. No one here knows me. I know I'm not a world class shooter by any means. I am very meticulous and detail oriented though, to include my shooting routines for groups and reloading methods. I would have to go through my notes, but I would guess I went through 160+ hand loads during load development. I tested three powders (H1000, Retumbo, and IMR4350) and two bullets with all three of those powders (212 ELDX and 210 ABLR).
I got good results with both bullets and all three powders, but not consistently. Any time I got sub 3/4moa results, I would duplicate the load and load additional rounds for testing at varying seating depths and with minor powder differences on either side. Virtually every time, the groups would open up substantially, to include the identical load previously tested (1.25moa and bigger).
I would definitely like to leave the rifle as is if I can find a consistent load that is ~1/2moa (other than a lightweight 165gr). But if bedding is a likely issue, then I will either tackle it myself or pay someone to do so.
Not that this proves anything, but I have a Seekins Element in 6.5PRC. It is substantially lighter than my Fierce, and I don't have a brake on the PRC, so the recoil feels as strong or maybe stronger than the 300wm. I consistently shoot 1/2moa groups from various locations and conditions. I'm sure it is capable of more than I am.
Thanks for all the advice and insight. Keep it coming so I can come up with the best approach to be happy with my desired outcome in the 300wm.