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The problem i have w/a rest and bags is the fact that i have three sporter weight rifles <font color="blue"> w/ roundish forearms and they tend to twist/roll easily </font>.
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Due to my local environment I have to use a pedistal rest and rear bag for load development. More on that later. For all other shooting I use the bipod and beanie bag.
Regarding the twist/roll thing. All my rifles are sporters with round forends. Notable calibers are 338 and 375. With the 375 H&H you can add "bounce" to the list.
Here's what has helped me.
A bit of a grip by hand helps. Pull it into your shoulder a bit. Helps to have a tactical type grip or thumbhole but not necessary.
Second is a bag with "sand" that you like. I like the type shown, rough out leather, not plastic. It has a bit of grip but not very much. With fine enough sand you can form it fairly easily to conform to the stock, and it tends to stay. Kind of like braking in a new baseball glove.
With moderate recoil rifles it works great also for any larger cartridge that recoils straight back or any braked rifle.
However, when shooting the unbraked Ruger #1 375 H&H I cover the exposed metal parts of the rest with leather. Learn'd the hard way, now I have one and only one barely noticable ding on the forend. [img]/ubbthreads/images/graemlins/frown.gif[/img]
One of my bipods is a Caldwell twist and tilt model with which I get along quite well. Also the Harris has a bit of flexibility. And the ground will never be perfectly flat when you make your shot at real stuff.
Also note that many of the "big guys" here always shoot off the bipod so you can see that I have a bit of a ways to go. Just not ready for throwing the 'crutch' away yet for load development.