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Here's a suggestion for you. You will need to load one brand of brass only as the interior dimensions are probably different and you'll get different pressures. Load one round only of each weight of powder like 1 each 37.8 grs, 1 each 38.3 grs, 1 each of 38.8, until you hit maximum of 42.0 grs. Shoot each one at the same target from the lightest to the maximum loads and note each bullet hole. As you shoot, you should have an area where the bullets will focus on a point of impact. Most likely around 80% of max loads. This is where you need to work on your powder load. It maybe that loads from 38.8 to 41.6 all group together with the others looking like flyers, but there will be a focal point. I would then suggest that you pick a load from the middle of that group and vary the Overall Length or seating depth of the bullet. Their suggested OAL is 72.9mm but it may require longer or shorter OAL to dial in the accuracy. When going longer, chamber the round, extract it, and look at it for signs of the rifling on the bullet. If you see rifle marks, it's too long and back off. This will usually bring a grumpy gun under control. As to the barrel length, you are only losing maybe a 100 ft per second and shouldn't be an issue if the crown is correct and it appears that it is as it shoots factory ammo.
FWIW, it appears that the S335 is a washed down version of our H335 as the data is identical across the spectrum. It should be a pretty decent powder in that chambering.
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