best way to test loads on a rifle

Common sense says the more stable the platform, the better the results. If that means heavy front rest and rear bag, do it. I'd bet because of a pulled shot or 2, or a slight gust of wind, most of us have walked away from a handful of "Loads of a Lifetime".

That said. I use a front rest for hunting guns, bipod for the rest of them.
 
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thanks for the replies, now to add another question
is it ideal to test loads on the bench or on prone?

I too also use a harris with a rear sand bag, and can anyone recommend a GOOD rear bag?
 
Lead Sled with bags. It removes even the slightest possibility of your anticipation of recoil and most of the influence of your body. You can almost just touch the rifle at the trigger.