I have a 1988 Model 700 Classic 35 Whelen, reamed out to the Ackley Improved design. I can shoot the Woodleigh 310 into less than an inch. The orignal barnes 250X is very long also, I got around .5" average with it. My impression is the Whelen will shoot about anything you put in it! What a great cartridge!
Last night, I loaded up some of the new Barnes 200 TTSX, over H322. I shoot the 2nd generation 200X (Secant ogive) over 58gr for 2970 ( I have a fast barrel also) I am going to see if i can meet or beat it with this more streamlined design, working up slowly of course.
I got this load, years ago, from Barnes original Load Manual #1, and this 58gr was for a standard Whelen. I could put more powder in the Improved case, but found that 58gr was perfect for accuracy and moderate pressure ( another reason I like the Ackley design) Since I use the 200X as an all around load, the TTSX looks very appealing to me.