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I don't know why you would place a 100 yard limit on yourself with a fine rifle like that. It is quite a potent round, and ordinarily, the Finnish Mosins are quite accurate. My 1944 M39 will do 2" or better five-shot groups at 100 yards, and I don't think it is anything out of the ordinary.
Military bores do vary, so you should do the slugging thing. However, I've heard serious collectors opine that all the Finns slug at .310". I can't vouch for the general statement, but mine does.
I do have a strain gauge on mine, and have done some load development. In my rifle, 50 grains of Varget and a 150 grain Speer .310" bullet get me 2840 FPS and a trifle over 50 KPSI peak on a hot day. With the more manageable barrel length of the M28, you'd probably still be around 2800. Your results will undoubtedly be somewhat different from mine.
I'm not at all embarrassed to take mine out after deer or elk.
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