Well it's a heck of a lot further seated that one bullet diameter. It's more that two. The deeper you seat the bullet the more possible you can create some very high initial pressures.
I only want to use 139 scenars. They are long slim boat tails with a very high BC.
Sure, you might not reach peek velocity. I got a friend who built his 300RUM with no freebore. So loaded to 3.6" COL with a 200gr matchking his was .005" from the lands. One, it shot extremely accurate, but he had to throw out the loading data on it. And couldn't reach 3000fps without pressure signs.
Hey, its gun, you not sure if you was asking for advise. But I gave my 2 cents.