.270 loads with Barnes TSX 140 grain bullets

[elpac3]

Was just given some Barnes 140 grain TSX bullets for the .270. Loaded up the first the and fired them off at the range. Bullets were seated to Barnes recommended COAL.

Group was more like a pattern, about 4 1/2 inches at 100 off a rest. Slipped in some old Speer 130 BT, seated .010 off the lands and grouped .9"

Went home did some reading and found a rate of twist calculation formula. Ran the numbers and most of the "new" bullets are coming out long and according to the formula it is looking like a 1:9 or 1:8 twist would be indicated vs. the old 1:10 in my .270.

Have some Nosler ballistic tips I am trying out as well. Have shot these for years. Used up the last of the "old" ballistic tips and bought some new ones which are longer than the old.

With everyone seeming to be jumping on the new secant or hybred ogive in addition to the all copper bullets, the bullets are getting longer. In fact several of the bullets cannot cannot be seated at the .010" ogive length that has proven best in my rifle in the past. Magazine length is proving to be a limiting factor.

Anyone have any insights, thoughts or words of wisdom they would be willing to share?