Might be taboo, but I use a Hyskore rest that Iv'e doctored up that is mounted to a break room table that is strapped to the front end of my quad trailer. It's at the perfect height to stand inside the trailer tongue framework and shoot with a remote release. I use this for load development and when I have a load that is money, then I shoot without it and work on technique. My nephew and I have recently developed loads for two 300 win mags and a 7 mag with it. Mainly it takes out the human element until the load is for certain. The rest itself is a *** from the factory but with some work it is effective and saves the shoulder for shooting loads that are known to be accurate.