The Gun Room: Episode 29

One of the most common things folks do when inspecting a potential shotgun purchase is shoulder the gun. It seems an interesting thing that ‘gun mount’ is such a crucial part of the gun purchase, but so many folks simply shoulder a gun and assign a non-quantitative value to it: “oh this shoulders nice” or “feels right”. So many of those folks realize that a gun must ‘fit’ but very few actually know or understand their own dimensions and how they translate to a gunstock. The same holds true for backyard clays shooting when you try a new-to-you shotgun that seems to break everything you point it at. In those situations gun fit and by association stock dimensions are the heart of the matter. Im Joel Penkala and this is 10 Minutes on Gun Fit.

The most basic of gunstock dimensions and one that is actually addressed by some gun companies is the Length of Pull or LOP(as it appears on many online gun listings). The length of pull is the distance from the center of the trigger, rearward to the center of the butt plate or pad. This is also expounded upon at times with three different LOP measures: LOP to the heel, center, and toe. The comb is the top of the stock, where your cheek rests which terminates at the heel, while the toe is the bottom portion of the end of the stock. It is typically tapered and comes to a point. LOP to the center determines the primary contact between shooter and buttstock, but the heel and toe measures give an idea of the stock’s pitch.

Pitch is the angle between a line defined by the rib (and/or comb) and the line defined by the butt(given that the butt is not curved). If you imagine laying the long leg of a square on the rib, the 90-degree angle defined by the square would be pitch. This angle can obviously be greater or less than 90 depending on the shooter’s preference or the gun’s intended use. Typically pitch is adjusted for guns that will shoot driven birds; all overhead shooting where the gun is pointed primarily up, vs rough shooting where shots are out in front of the shooter. Pitch can also be adjusted so that the toe of the shotgun does not dig into a shooter’s chest. Shooters with fuller chest dimensions will oft times complain about this digging of the toe.

LOP is important because it determines the geometry of the shooter’s arms. A short LOP will ‘chicken-wing’ your arms; the angle at your elbows being very acute. A long LOP will open up the angle of your arms and in extreme cases even straighten out the arms. The goal here is to adjust the LOP to create a proper geometry between the shooter and the shotgun or rifle in question. There is of course a sweet spot where the shooter’s arms are comfortable and provide the most stable and controlled connection between the gun and body.

LOP is addressed by companies like Rizzini and others who typically include a basic thin wooden or black butt plate with their guns. The idea behind this is that they leave as much stock wood as possible by only adding a thin pad. Then the shooter can add a 1” or larger recoil pad to increase LOP or cut the stock down and add a pad to decrease LOP. Other instances like youth guns for example typically have shorter LOP to fit youth shooters.

Two other primary stock dimensions are drop and cast. Drop addresses the relation of the comb to the rib up and down, where cast determines the relation of the comb and rib left to right. Drop on a stock comes in two (sometimes three) measures, and they are usually listed in order from the nose or most forward part of the comb to the heel. The measurement is actually the distance from the line defined by the rib (and parallel to the bores), to the spot on the comb being measured. One can get rough dimensions of drop by placing a shotgun upside down on its barrels(and thus the rib) and taking the measure from the comb to the tabletop. These measures are complicated by Monte Carlo stocks with elevated cheek pieces, which sometimes have drop measures for each end of the raised cheek or Monte Carlo piece, as this is where the shooter’s cheek contacts the stock and in effect is the important factor in drop. Proper drop will position the shooter’s eye in line with the rib. Too much drop and your eye will be below the barrels and when your face is properly against the stock, you will be looking at the breech of the gun. Too little drop and you will be looking down at the rib, seeing the entire length of it while shooting.

Too much drop requires the shooter to lift their cheek off the stock to appropriately sight down the rib. Though this can be done, it is no longer in vogue. The old style of head-held high shooting has gone by the wayside as folks have moved into more modern styles dictated by sporting clays and other shotgun sports, though this old shooting is immortalized by our favorite shooting artists in many of their classic pieces. Too little drop is very hard to adjust for because you can’t ever get your eye pr...