Taken from Bergara's website...
"All B-14 rifles are capable of producing sub-1.0 MOA groups or less at 100 yards using factory match grade ammunition."
Did you try match grade ammo? Is probably the first question they'll ask.
When compounded with other factors that come with a non match load yes. Brass consistency, bullet run out, temp sensitive powder, standard primer, powder charge weight, etc. Those factors are minimized with match ammo that's what makes it more accurate
It can be alloyed with aluminum and other metals to make it stronger while retaining light weight and strength. It may not be the one solution but something has to change for me personally for the chassis to gain traction. Out should only weigh 2lbs IMO
I would still try the ammo. Some factory hunting loads are remarkably temp sensitive. If it won't shoot the match stuff then I would suggest sending the gun in. In the old days factory hunting ammo would be considered good if it shot 2 moa.
There is something awesome about being able to pull the trigger on an animal, cycle the bolt, and then come back on target right before the bullet hits!