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?
6.5 CM 7.5 twist: which bullet weight?
- Thread starter Oldmauser
- Start date
147 is fine with 1-8
Under spinning them is generally the key for tighter groups.
Over spinning is for transonic and subsonic performance.
Under spinning them is generally the key for tighter groups.
Over spinning is for transonic and subsonic performance.
Maybe it isn't the bullet/twist combo that is the issue. Could be you just don't have the load quite finely tuned.
I have always felt the 6.5 bullets (all of them) don't need the 7.5 twist. I'm shooting 153 A-Tips in my 6.5 PRC and see no problem with 1,000 yard groups.
I have always felt the 6.5 bullets (all of them) don't need the 7.5 twist. I'm shooting 153 A-Tips in my 6.5 PRC and see no problem with 1,000 yard groups.
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.
140 grain bullet with 1-8.
I’ve burned down a few 6.5 barrels now as for as I’m concerned 1-8 is the secret sauce.
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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...
I’d be worried about blowing up 147’s with 7.5.
my 1-8 had plenty of problems with them.
As far as correlation of 130 and 7.5, you just got a great barrel and can utilize it but I think you already know that.
I have shot some 130 ELDS and wasn’t disappointed. But the Berger AR hybrids are what I typically run, they’ve been fantastic bullets for me.
what's your barrel length?
OP, you should try 140 hybrids, 140 ELDM, or even 150 SMK if you have room to run that long of a bullet.
Load development isn't as simple as that.
What have you done to fine tune your current load?
The common question of "what's the best twist for X bullet" implies a shallow understanding of how to maximize accuracy.
Yes, sir. That's why I post my question on SH, so I can improve my understanding of accuracy.
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.
The conversation is much more productive if we understand what you've already tried.
Just yesterday I finalized my 6.5 Creed load using a Kreiger 28" 7.5 twist barrel. I'm using 147 ELD's at 2828 and shot 3 sub 5" groups and several sub 7" at 1000yds. The conditions were excellent. Very happy with the results.
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.
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'm surprised you didn't blow up the 147s. Others seem to blow them up occasionally on 8 twists...
I haven't had a single hiccup or gripe with the 147eldm but the lot I have is atleast 4-5years old.
I to have seen of few of the threads lately pertaining to just that.
I went from the 147’s to the 130’s.
Flatter trajectory at the ranges I run that rifle at now.
Would that happen to be inside 1000 yards? Did you notice a huge difference in windage?
My hawk hill 7.5 twist likes 140g eld the most by far. Generally .4 groups with an odd .6 here and there.
Out to 1200-1300ish Is where that rifle is designated for.
Wind is very similar but it’s flatter and softer shooting.
Back when that rifle had to cover everything I ran 147’s.
Then two things happened.
First newer production 147’s starting blowing up and second I built a rifle for further distances so I re tasked the 260 for the inside stuff and for friends to shoot.
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