Dan Hanus on how Bergara Custom Rifles are bedded
The benefits of using pillars when bedding a rifle in to a stock are more than just accuracy driven; reliability plays an important factor too. The relationship between the action of the rifle and the ammunition source, whether it is an internal box magazine or an external magazine is critical. Not paying attention to this relationship will cause feeding and accuracy issues that could have easily been over come early in the building stages of the rifle.
If the pillars are too short the magazine can bind causing both feeding and accuracy issues. An example of a feeding issue is a double feed. This is when 2 cartridges are attempting to feed into one chamber. As far as accuracy, a binding magazine box between the action and the bottom metal will cause accuracy issues. It can bow the action and cause undue stress on it. It will also disrupt the harmonics of the rifle.
Pillars that are too long can cause a failure to feed as well. If the ammunition is does not sit high enough in the magazine the bolt will move forward without ever picking up the cartridge. Many manufactures of bottom metal, for example Badger Ordnance will provide pillars that are already cut to the length needed to ensure proper feeding. Pillars that are too long will not have any effect on accuracy.
Many fiberglass stock manufactures utilize a soft fill. Soft fill is filler used as a baring surface for the barreled action and bottom metal. The name soft fill describes it perfectly because if a rifle is assembled in a soft fill stock the action screws can be torque and actually crush the stock disrupting the proper distance between the action and ammunition source. Wood stocks are similar to soft fill fiberglass stocks in respect to crush factor. By using pillars it ensures the correct distance between the action and the bottom metal is always consistent even if the action screws are over torque.
By installing pillars you maintain the correct distance between the action and the bottom metal. By maintain this distance you ensure not only a reliable feeding rifle but and accurate one too.
By Dan Hanus, Bergara USA Custom Rifle Production Manager