Obviously you want the most precise load / rifle combo possible for varmint hunting. The level of precision needed depends on the size of varmint, the distance you intend to shoot, and your ability to shoot accurately in the field.
I like to have my varmint rifles shoot in the .5's but this isn't always attainable. Some of my most successful hunts have been with rifles that shoot in the .7's to 1 moa. If you do enough of it and practice enough in under field conditions meaning shooting at the range in the manner you intend to hunt in the field you'll soon develop an good understanding of your limitations.
I use shooting sticks so my range is more limited than those using a bipod in the prone or a field shooting bench. The prone bipod doesn't work for me because it's too restrictive limiting my field of view. Hauling a bench in the field doesn't work for me either because I like to roam around and change fields frequently. So my ethical effective range is about 250 to 275 yards on a ground hog, a bit further on a predator.
An effective drill for measuring your skill to hit a ground hog is to take a 3 x 5 card, tape it to a piece of cardboard* and see if you can place 5 of 5 shots in the card. Placed in the vertical position, it simulates a standing hog, horizontal - a crawler. By moving the target out to various distances you'll soon get an idea of your maximum effective range for making an ethical shot on a standing hog and crawler. Besides being a lot more fun than shooting off the bench - it will hone you field shooting skills.
*it's quite easy to make a holder for the target using two piece of pointed steel strips and binder clips for field used or just use the target backer at the gun range.
I like to have my varmint rifles shoot in the .5's but this isn't always attainable. Some of my most successful hunts have been with rifles that shoot in the .7's to 1 moa. If you do enough of it and practice enough in under field conditions meaning shooting at the range in the manner you intend to hunt in the field you'll soon develop an good understanding of your limitations.
I use shooting sticks so my range is more limited than those using a bipod in the prone or a field shooting bench. The prone bipod doesn't work for me because it's too restrictive limiting my field of view. Hauling a bench in the field doesn't work for me either because I like to roam around and change fields frequently. So my ethical effective range is about 250 to 275 yards on a ground hog, a bit further on a predator.
An effective drill for measuring your skill to hit a ground hog is to take a 3 x 5 card, tape it to a piece of cardboard* and see if you can place 5 of 5 shots in the card. Placed in the vertical position, it simulates a standing hog, horizontal - a crawler. By moving the target out to various distances you'll soon get an idea of your maximum effective range for making an ethical shot on a standing hog and crawler. Besides being a lot more fun than shooting off the bench - it will hone you field shooting skills.
*it's quite easy to make a holder for the target using two piece of pointed steel strips and binder clips for field used or just use the target backer at the gun range.