Caldwell lead sled 3 was on sale at Cabelas for a good price so picked that up today. Plan to sight in a couple rifles for deer season the next couple days which leads me to a few questions. I've been doing some research and forums are saying not to put too much weight on the sled or it could risk cracking wood stocks. Anybody have any experience with them? It advertises holds 50lbs, but i was thinking start with 10lb and maybe up to 25lb tops.