Not calling you wrong M98, but I thought the practical velocity gain with powder increase was around 10% by proportion to increase.
Barrel length may increase the velocity, and maybe the extra bbl length would have done it without the improvement. Each rifle is an entity unto itself.
This is a case of diminishing returns. At the very high end of powder capacity, the return in velocity as weighed against the percentage of powder charge increase is not linear, and Barnsness was actually right commenting that the .35 Whelen is not the greatest candidate for the Improved version unlike the .257 Roberts, 7X57, .30-30, and .280. As noted above the standard .35 is a confusing and exceptional caliber all on it's own, driving heavy bullets faster than an '06 can while maintaining great SD. Like the .338-06 it's hard to explain why it does what it can, but it just does. Any opened up '06 typically really shines. BTW, contrary to a lot of opinions it WAS invented by Colonel Whelen, not simply named after him....




















































