Filled the bags myself w rice - Caldwell DeadShot Shooting Rest Bags

Great valve and the “fill yourself” option was the better choice for me. I was able to stuff the bags with rice to achieve the perfect density. As one reader said w the larger calibers even the larger bag moves around. For sighting in IMHO you should use a bipod and mono pod to better brace the chassis. Otherwise these bags are great. And they are with my on every range outing.