Retumbo works great for 140s, I never tried lighter bullets with it.
For those wondering...
The Winchester M70 Extreme Weather chambered for the 264 Win.Mag has a 9" twist.
Run the data on those 140 and 142 gr bullets out of that 9 twist barrel through JBM Ballistics Stability (Sg) calculator and I’ll bet you get a surprise. Use 0.199” for length of plastic tip.
Calculator shows 1.30 SG with 140 VLD (1.400" length) at 3,000 fps in a 9" twist.
142 smk (1.380" length) at the same 3,100 fps, shows 1.39 SG.
That was using Berger's stability calculator.
Not optimal, but plenty good to stabilize and if I had a 264 WinMag with the 9" twist, I wouldn't think twice about shooting up to 140 gr bullets.
yepRetumbo works well
Magnum ? Lrt?RL-23
RL-25
RL-26
RL-33
Viht. N-165
Viht. N-170
Viht. N-560
Viht. N-565
Viht N-570
H-1000
Retumbo
IMR-7828 / 7828ssc
IMR-7977
IMR-8133
Norma MRP-2
Norma 217
Accurate MAGPRO
I recommend the 100ttsx at max speed. That could be R17 orR26 they are both great. Even though 100ttsx is light, it is devastating. With increased speed it makes increased penetration because the bullet won't disintegrate or come apart. It also makes a bigger wound because of the higher speed. Bones won't stop them. The 100ttsx is super accurate also. This one bullet is good for all your needs, out to about 300-325 yards.