@JoelA. I shoot a 16" with supressor but do reload et al. The max range shot I'll take is at 300 metres.
That said; I have used factory ammo in several different brands of shortened .308's. The most consistent in terms of velocity and accuracy was Sako Gamehead. In your shoes I would forget about velocity seeing as you don't have the means to measure it. Assuming you've got access to a range, Zero your rifle @ 100 metres. Then step it out to 200 metres. Group and measure drop, should be roughly 3". That being the case you can safely assume an 8" drop at 300 metres from 100 meter zero.
I figure if I'm taking shots at the two latter extended ranges I've got time to faff about. That has proven to be exactly the case. My scopes a dial up variety. I don't compete but do knock over animals.
Hope this assists. Cheers
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