I was able to get pretty good accuracy in the .243 with the 55 gr. Ballistic Tip with only one powder - H414. And the best load was not quite full throttle - but still doing a respectable 3900 with the standard 1:10 twist barrel. I think the ideal twist for this bullet would be around 1:16.

Generally, I like the performance of the 70 gr. Ballistic Tip better than the 55 gr. BT for varmint hunting.