One Rear Bag for Everything – How to Choose for Prairie Dogs

He had three bags in the back of the truck, a canvas one with leather ears, a slick nylon one that slid off the bench every time he reached for the bolt, and a stiff little pillow he had bought on a whim. He tried each of them in turn during the first hour, grumbling a little at every swap. By midmorning he had settled on the plain one, the one with the firm fill and the tall ears, and he did not touch the others again for the rest of the day.

Shooting prairie dogs from a bench rewards a very particular kind of support under the butt of the rifle. A deer hunter might take one shot without a rear bag at all and never know the difference, but a day on a colony asks you to place a small bullet on a small target again and again, at changing distances, for hours. The rear bag is the quiet partner in all of it. A good one controls the rifle’s elevation as you move from one animal to the next, lets you track the shot through recoil, and spares your shoulder and arms from the creeping fatigue that ruins accuracy long before you feel tired. A poor one makes you muscle the rifle, and muscling is the enemy of a steady hold. This guide covers the characteristics that make a rear bag work for colony shooting, from fill to ears to base, so that one good bag can serve you all day.

Why the Rear Bag Matters So Much

A rear bag controls elevation when you engage animals at varying distances. Without it you will lift and lower the rifle with your shoulder and arms to move between a nearer dog and a farther one, and every correction introduces inconsistency and effort. The bag also holds the buttstock in a consistent position, which lets you stay behind the scope through recoil and spot your own impacts, a skill covered in tracking through recoil and follow-through.

Fatigue is the hidden cost of poor support. Shooting for hours without proper rear support makes your shoulder tired and your arms strain to hold position, and your groups open up as the day goes on. A quality bag prevents that by supporting the rifle naturally, so that all you are doing is steering and squeezing. You can see how it fits among the other pieces of the bench in the minimum requirements for a bench and in bench bags against a bipod.

Size and Fill

A medium-size bag usually works best for bench shooting, because it has enough mass to stay stable without being so large that it is slow to adjust. Too small and it tips or shifts under recoil. Too large and you cannot squeeze it well enough to make quick elevation changes. I will not hand you exact dimensions, because they depend on your stock and your bench, but the test is simple: the bag should sit comfortably under the buttstock without overhang and without the stock hanging off the edge.

Fill material is a real choice. Heavy fill, like sand, gives more stability and stays put through volume shooting, while lighter fill, like plastic pellets or crushed walnut shell, is easier to squeeze but moves around more. For a colony session, where you may fire a very long string from a solid bench, stability usually matters more than ultra-fast adjustment, so heavier fill tends to win. A firmly filled bag also returns to its shape after you squeeze it, which gives you repeatable elevation control from one shot to the next. If you carry your bags a long way, think about weight too, and let a vehicle set up well for the day help you decide how much you can haul.

Ears That Hold the Stock

The rabbit-ear shape, with two vertical lobes, grips the buttstock and keeps it from sliding sideways during recoil. This matters enormously in volume shooting because the bag stays where you put it, with no constant readjusting. Flat or wedge-shaped bags are fine for a single shot but tend to wander over a long string, forcing you to reset your setup again and again.

Ear height matters as well. The ears should be tall enough to grip the stock firmly but not so tall and floppy that they collapse sideways. Short ears give too little contact, and the stock rocks. Choose a bag whose ears stand up on their own and spring back after you squeeze them. If you ever find your rifle shifting for no reason, check the ears before you check anything else, because a worn bag can cause trouble that looks exactly like a rifle problem. Vertical stringing, finding the cause lists the other suspects.

A Flat Base That Stays Put

A bag with a wide, flat bottom sits steadily on the bench, and a rounded or narrow base rocks when you squeeze the ears. Over a long day, a stable bag keeps your reference point the same, while an unstable one slowly shifts and causes impact changes you cannot explain. Look for a base that will not roll or slide on a smooth bench surface, especially when you load and unload between strings.

The surface of the bag matters too. Grippy material such as suede or heavy cordura holds both the bench and the stock, while slick nylon slides during long sessions. A small anti-slip mat under the bag is an easy fix for a smooth bench, and the anti-slip mat explains why the small upgrade pays off. Dust also finds its way into zippers and seams, so keep an eye on the closure and see prairie dust, keeping rifle and glass working for habits that protect your gear.

Micro-Adjusting Elevation Between Dogs

Squeezing the rear bag raises your point of aim without touching the turrets. This is the technique that makes the bag so valuable on a colony. You spot a dog at one distance, shoot it, and then see another a little farther out. A gentle squeeze lifts the reticle slightly, and you are on the new target in seconds. It works because the animals are small enough that you are making precise but minor changes within your working range.

The knack is to have a bag with enough give to compress smoothly but enough firmness to hold the new position through the shot. Squeeze too hard and you introduce tension that spoils your trigger press and follow-through. Squeeze lightly and let the bag do the work. The skill becomes instinctive after a few hours, and it lets you leave your turrets alone for the small moves, as described in dial or hold for fast corrections. It also fits the way your body sits, so check chair height and group size if the elevation never feels quite right.

Mistakes With Rear Bags

• Overfilling the bag, which makes it too firm to squeeze and forces you to muscle the rifle
• Choosing fill that is too light, so the bag shifts under recoil and needs constant readjustment
• Using a bag with no ears, which lets the buttstock slide sideways and breaks your cheek weld
• Positioning the bag too far forward, under the grip and not the butt, which removes elevation control
• Squeezing too hard, which adds tension to the trigger press on a small target
• Not checking the bag position, which slowly drifts over a long string and causes vertical stringing
• Using a flat shooting-mat bag on a bench, which is too unstable for the job

Most of these are quiet failures. Nothing breaks, nothing announces itself, and the only symptom is a slow loss of consistency that you may blame on the wind or your own eyes. The cure is a small habit: glance at the bag between strings, reset it if it has crept, and give it a squeeze to check the fill. If you are testing a new setup, do it at home first. Your first prairie trip, a no-stress day plan is a better place to learn how a bag behaves than a busy colony on a hot afternoon.

A Quick Rear Bag Checklist

• A medium size that fits under the buttstock without overhang
• Firm fill that still compresses with moderate hand pressure
• Tall, springy ears that hold the stock sideways
• A wide, flat base that does not rock
• A grippy surface against the bench and the stock
• A bag position under the buttstock, not the grip
• A quick check between strings for drift and settling

Checking the Fill

How firm is firm enough? A useful test is to squeeze the ears with moderate hand pressure. If they barely move, the bag is overfilled and will fight your elevation changes. If they collapse completely, it needs more fill. You want something between, a bag that compresses partway and then holds. Fill settles over time, especially sand, so check it every so often and top it off when the bag no longer squeezes the way it used to. I would not trust a fixed round count for this, because it depends on the fill and how hard the bag is used.

Think about the bag as part of the day’s supplies too. It deserves a place on a complete packing list, along with a spare if you can carry one, and you can size the rest of the supply with how much to bring. If you ever forget it, your backpack as a shooting bag is a workable rescue, and using a tripod as a front rest covers the front end of the same system.

One Bag for Many Jobs

The appeal of a single good bag is that it handles most of what you meet. A medium bag with rabbit ears and a firm fill works on a bench, a truck hood and a shooting mat equally well, and it means one less thing to choose and one less thing to lose. It is not perfect for every situation, but it is good enough that you stop thinking about it, and that is the point. The best equipment is the equipment you forget you are using.

Pairing it with a steady front support finishes the job. A rear bag does half of the work and the front rest does the other half, so choose them as a pair. If your trigger work or your position still feels inconsistent, look at trigger setup for towns and choosing a position on prairie dog towns before you buy anything else. Discipline for prairie dogs is mostly the habit of fixing the boring foundations first.

The Short Version

• A rear bag controls elevation and holds the butt steady through recoil
• A medium size with firm fill and rabbit ears suits most bench work
• A flat, wide base and a grippy surface keep it from sliding
• Squeeze lightly to adjust elevation between dogs
• Check the bag for drift and settling between strings
• One good bag can handle most of your shooting

Choosing a Rear Bag for Prairie Dogs

The Plain One With the Tall Ears

I watched the man with three bags go through his morning, and I thought how much of good shooting comes down to getting small things right and then leaving them alone. The plain bag with the firm fill and the tall ears did nothing remarkable. It simply never made him think about it. That is the whole job of a rear bag, and it is why one good one is worth more than a truck full of experiments.