sand bag in front and a sock with rice for a squeeze bag in the back
for the money sand bag and sock are really cheap
other options from less to more expensive
a good web sling
if you want it more mobile a back pack stuffed with clothing
a Harris bi-pod and the sock of rice also work well
the thing about lead sleds is your gun doesn't shoot the same way when in your shoulder , how every you hunt is how you want to sight in.
if and bags are inconvenient to adjust the bench rest guys use a front rest and rear bag
the caldwell jr front rest works nice a smaller version of what the benchrest guys use , they also have the larger versions of it
https://www.midwayusa.com/product/1015052687?pid=682659the larger rock rest with rear bag
if your trying to shoot groups for load development the stock resting free on the rest or sand bag and in your shoulder with a rear squeeze bag be it sock or commercial will give you the most repeatable conditions in the field over a pack