I managed to get the ole Husky out yesterday with 325 gr Normas over both H-414 and N-550. I was able to make 2300 with both powders, although an additional half gr of H-414 resulted in pressure signs while an additional half gr of N-550 did not. Having had a previous experience with N-550s bad temper when highly compressed, I'm not interested in pushing the envelope further; besides, if I can't do it with a 325 at 2300, I've got a .375 with 380s and a .458 with 500s.
The VV manual suggests a maximum load of 62.3 grs of N-550 under a 320 gr Woodleigh for 2297 fps in the 9.3X62, but 62.5 only gave me 2255 albeit with 5 grs more bullet weight. I went up in half gr increments getting 2306 fps with 63.5 grs and no pressure signs. I fired a 64.0 gr load which again showed no pressure signs in my rifle, but the Chroney gave me an error message, but I doubt that velocity was much greater.
Interestingly, H-414 also gave me about 2300 (2293) with a 63.5 gr load, but showed dangerous pressure when raised to 64.0 grs and the velocity read 2324 fps. This makes me question the wisdom of choosing H414/W760 with this bullet for use in warmer weather, where similar performance can be realized with N-550 without the pressure demon raising it's ugly head. I observed a velocity plateau of 2260 between 62 and 63 grs, which might suggest that is the sweet spot for this powder/bullet combination. N-550 had no velocity plateau up to 63.5 grs.