I shot the barrel out of two 6/250 AI's on p. dog towns, 11 twist Pac Nor barrels.
In a 28" barrel, I shot the 70g what evers at 3800, tiny, tiny groups with Win 760.
This case is right on the heels of a 243 AI, but in a shorter package.
The 6/250 AI has more capacity than the 6x47 Lapua, and would have to do some measuring to see how it compares to a 6 Creed.
I never have had any problems feeding the 250 AI out of a rem 700...never.
I usually fire form on hair. I sold the reamer and Dies, I could kick myself for that...as the mule that I bought with the money almost killed me running off as soon as my butt hit the saddle with only one foot in the stirrup.
I would highly recommend the 6/250 AI as there will be plenty of magazine box length left to chase the lands vs longer cases.
Over the past few years, I am shocked as to why no more people have tried this case. You could fire form with 14-15g of Bullseye and Cream of wheat if you don't like to hunt with fire forming loads. My fire form loads were around 3/8". My dad massacred p. dogs at 600 yards with this rifle...his last hunt.