Look at Cabelas for "the Rock Jr." and also "Lead Sled Solo". They're basic and somewhat adjustable. You might find one of them used on GP or EE. Much more stable than bipods. And watch for a Primos G-T, someone might not appreciate it. They weigh ca 15#, with square tube steel and cast front tripod. Also, look into some sort of bubble level for your scope. I've found it's an immense help on my 457, a 419 rail with a built-in level. I just started using one this Summer and have improved groups a bit - relatively cheap mod.