.308 cast bullets with a 1:10 twist barrel will start to lose accuracy due to too high a spin rate somewhere between 2000 and 2400fps. If it is a 1:12 twist you could go up to 2400-2800fps.
I've tested mine with the 210gn bullet quite a bit. The best accuracy is just under 2000fps but sometimes I can go a bit higher. I use a lot of 4166/4064 in mine.
For low vel stuff I use 160-180gn bullets at just under 1200fps. Blue Dot has worked for me but many others are ok as well. Depending on bullet you could stay under supersonic.
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