I am getting ready to start ordering goodies to build a Robertson my 12 action and am wondering about twist rate. The rifle will primarily be a deer/medium game rifle with most shots where I hunt being less than 150 yards. The bullets I plan on testing in the beginning will be Barnes TSX and TTSX both 100 grain and nosler partition 115 grain. I know standard twist for most 25's is a 1:10 but I am thinking of a faster twist like a 1:9. Is there any need to speed up twist for the longer bullets at 257 Roberts velocities or will the standard twist work just fine?