Most don’t bother with the 7.5 especially with 140’s.I was tempted by my gunsmith to try "the new better twist".
I was hoping that some of SH users could share their experience with 7.5 twist in terms of optimal bullet weight.
I’d be worried about blowing up 147’s with 7.5.I started going with 1:7.5 260 barrels with the thought of trying 147s. I ended up never running them, but instead ran 130s. The 130s in my 7.5 Bartleins have been the most accurate 6.5 combos I’ve ran. There’s a lot of variables involved for accuracy beyond barrel twist and bullet weight...
Load development isn't as simple as that.I have been shooting 140gr bullets all the time(huge stockpile). I don't really have a benchmark to follow. I achieve sub moa accuracy at 100m, but it's clearly not enough. Is changing to 147/150gr the way to go in terms of tightening my groups?
If you look at the post you took that quote from, you'll see that I asked what have you done in order to fine tune the accuracy of your handloads.Yes, sir. That's why I post my question on SH, so I can improve my understanding of accuracy.
I'm surprised you didn't blow up the 147s. Others seem to blow them up occasionally on 8 twists...My 65CM wears a Bartlien 5R 7.5" twist finished at 23" (Breach face to crown) and shot everything from 123CC , 130 Hybrids, mostly 147eldm and some 150smk.
The only one that I haven't tried to tune perfect for the rifle is the 123CC since I mostly use it in the 6.5x47 I really don't think the extra twist is needed until you get to a bullet as long as the 150smk but it doesn't seem to have any negative effects with the lighter and faster 130 class bullets.
I haven't had a single hiccup or gripe with the 147eldm but the lot I have is atleast 4-5years old.I'm surprised you didn't blow up the 147s. Others seem to blow them up occasionally on 8 twists...
Out to 1200-1300ish Is where that rifle is designated for.Would that happen to be inside 1000 yards? Did you notice a huge difference in windage?