Re: Barrel/stock fitment
Might be able to explain a few points.
The barrel channel in the pictures is made to take up to Tikka tactical barrel.
Even with the varmint barrel it will have a good gap. I believe this is the way to go, even the smallest barrel gap will not avoid water and dust to penetrate but will not allow you to clean. The tight fitting stock is ok for some but not for others that use there rifle a few times a week and don't like taking the action out of the stock every second day. I think tight barrel channels and their disadvantages have led to enough misplaced shots in the past. A large gap around the barrel has no technical disadvantages just looks different and leads to a more reliable rifle.
I hunt all year round in pine forests, peat bogs and open hills in mostly wet conditions and am convinced the larger barrel channel is better. I can remove crud out of the barrel channel in the field with a rag, shirt or even a twig.
PSE stocks are built different, the stock is a full sandwich design, they are not milled (anywhere). If one mills out the barrel channel one would remove carbon or glass fiber structure. That is why these stocks are made with the larger channel and can be ordered in reduced in size via light weight filler if one wishes. This light weight filler can later be removed without any structural problems. Advantage of the full sandwich is a lighter stiffer construction. Similar to the difference of stiffnes of a pipe vs a half pipe.
all the best from Ireland