Just a note on sand bags for bench shooting.... This is probably old news to y'all but here is something that was suggested to me as an alternative to regular sandbags and I tried them out. It's been about 4 months now and I recommend them to anyone who uses bags at the range. Even with my big bores there is no leakage, dust, or slipping.
I found that I like dive weights better than sand bags. They are sold in 1, 2, 3, 5, and 10 pound sizes and are synthetic material bags filled with fine lead shot. They even come in colors.... mine are red.
The divers like them because they conform to the body better than the old fashioned solid weights.
The seams are folded, melted, and then sewn shut and because the bag is synthetic and waterproof the thread doesn't weaken and let go. They also don't leak fine sand after you use them awhile.
The synthetic material won't damage the finish on the gun, the bags stack very nicely, and they even look pretty good.... a lot better than a sand bag leaking dust and sand.
I use a couple 5 pound bags and I have a couple 2 pounders to fine tune the height of the rest I need.
They also do double duty as weight on my lead sled when shooting my rifles.
You can find them in any dive shop.
Just a suggestion I want to share.... they have worked out well for me.