Using PPU or Sellier and Bellot ammo hunting?

We've used S&B 6.5x55 140 soft points for a few years now. Accurate and taken mule deer and whitetails, moose and elk. Always performed good. Rifles are a heavy barrelled husqvarna (sp) and blaser R8 and K95. Same performance at -40 or +10.

^^ Taken a couple deer with same ammunition in 6.5x55. S&B SP in 222(50gr) and 223(55gr) spalled varmints flawlessly. Far as accuracy is concerned, S&B has been pretty good in my rifles... not a match winner, but "minute of whatever you are hunting at practical ranges" and about as reasonably priced as ammunition comes anymore.
 
Everything I have read says the twist rate is related to bullet length, not to bullet weight. Picture below is Hornady 139 SPBT, Hornady 175 RN, and Nosler 150 Partition - all in 7mm (.284"). Note that the 150 grain is longest. If your rifle is stabilizing 139 SPBT already, well worth to test out that theory and try those 175 Round Nose - virtually identical length!!

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Thanks. I checked my 175 grain round nosed bullets against a 140 grain NP the other day and yes indeed, they were the same length.
 
Thanks. I checked my 175 grain round nosed bullets against a 140 grain NP the other day and yes indeed, they were the same length.

I have a couple older Mauser 7x57 rifles - Boer War era, then pre-WWI sporters - 1893 patterns - very much throated for those 173/175 Round Nose - saving the Hornady RN for those old rifles. For newer rifles / hunting purposes the 150 Partitions have been just fine for deer - for the bigger 7mm's I plan to use the 160 Partitions; also have some 160 Accubond to try. I came into several boxes of 120 grain Nosler Solid Base and Ballistic Tip - should be fairly "zippy" if I want to make dedicated coyote loads.
 
here is a sellor bellot 150gr .303 factory from the sambar
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from this
he was in the centre clear face
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