jbpmidas said:
Testing at 100 takes alot more of the shooter out of the equation. Which, is exactly what you want when load testing. The further you shoot, the more human error you introduce. Load testing is better done close!
It all depends on what you consider a "good load"
A good hunting load?...yeah...you can probably get away with it... You wanna be shooting X's at 600 yards?... need good ammo and it needs to be very tight...I'd say an inch or less at 300...
For me, its a lot easier to see significant group size changes at 300 than at 100..Like I said before I've been impressed with myself before at 100 and then had to "re-group" (no pun intended) when shot at longer distance
My 2 cents...
The good news is...There's tons of powder suitable for 308....Varget, 4064, Reloader 15 to name just a few...
Back to topic...such as it is...IMR 8208 XBR (Extreme BenchRest) I have no doubt is good powder...wish I was closer and I'd take it off his hands
Good Luck in the quest for the "magic load"