Found an excellent load for Hornady 200gr. RN in .35 Whelen, this is a Ken Waters load that produced bughole groups for me and I thought I'd share. It is 54.0gr. of IMR 3031, it is a tack driver in my rebored Winchester pre'64 m/70. 52.0gr. is the starting load and that showed promise and increasing to 54.0gr. produced a 4 shot group that a quarter would cover.

I have a similar pet load, but it uses the hornady 200 gn SP and Rlr 15. I would have to get my load notes out to recall the charge weight, but it was over 2800 fs and very accurate.

Just out of curiosity, why would one want to move up to a 35 Whelan to shoot 200 grain bullets. You can do that in a 30-06.

Because of the greater sectional area a 200gr .358 bullet will reach significantly higher velocity and energy than a 200gr .308 bullet when they are loaded to equal pressures.

Why would you shoot a 200gr bullet in a 35 whelen? Because I have a 1000 of them and the deer and elk don't seem to care.

Just remember that the 200 grain RN was designed for the 35 Rem. and might be a varmint bullet at Whelen velocities.

My rifle is a custom Mark X bolt gun with a 24" barrel in A.I. 40° shoulder chambering. Empty fired cases have 73.8 - 74.0 gr. water capacity.

Light Load is 200 Hornady IL Spitzer over 60 gr. of A2520 for 2740 fps @ 52 Kpsi.
Accuracy Load is 250 Hornady IL Spitzer over 56 gr. of Varget for 2550 fps @ 54 Kpsi (consistent 0.3 - 0.5" groups @ 100 yds.).
Heavy Load is 250 Nosler Partition over 61.5 gr. of PP2000-MR for 2610 fps @ 57 Kpsi (3775 ft. lbs. energy).

that short 200 gr .358 bullet is faster out of the barrel up to a couple of hundred yards but looses its velocity and the 200 gr 308 or 30-06 takes the lead in velocity is pretty common knowledge.