Update:
I emailed Steve on Sunday night, but I hadn't heard anything back as of this morning, so I decided to submit a request through their website as well. Found out Steve is on vacation, and that's why he hadn't answered my email. I spoke with one of their gun builders named Billy instead (nice guy).
Billy isn't familiar with sizing bullets etc., so he had to talk to their engineer, who suggested that maybe there are merely some burrs in the riflings causing the issues, and it just needs to be lapped or broken in with more shooting
. After some convincing, Billy finally agreed that the rifle needs to be sent back to be looked at, so he sent me a label, and I dropped it off at FedEx this afternoon.
Billy told me that the Peregrine barrels aren't actually made by Green Mountain, which is odd because their website clearly states that they are.
He also said that the Peregrines have had nothing but problems (hopefully this doesn't get him in trouble), and he wishes they had never gotten themselves into them. Go figure!
I sent a sized bullet with the rifle, and I also took some measurements beforehand. My bullets are sized between. 4008 and .4012 (depending on how it's rotated in the micrometer). The free-fall in the clean barrel is 15", and then the seating pressure is about right from there down (with the exception of the very breech end where it is exceptionally tight, but it doesn't really matter anyway as the bullet doesn't get seated that far down). But that's in a clean bore. Ideally, I really need to size the bullets slightly smaller as the seating force required in a fouled bore has been fairly significant (I would guess 30-40 lbs), which has made applying consistent force more difficult. This may also be a factor in my vertical stringing issues.
It will be interesting to see what they say. I feel their pain. There is nothing worse than dealing with quality complaints that you don't know how to correct.