What was the powder charge with the 143 and 8133 and what velocity were you getting?
7mm STW Brotherhood - For those who shoot the 7mm Shooting Times Westerner
- Thread starter The7mmSTW
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I had trouble getting the 143 to shoot in one of mine which has a 8.7 tw Bart. Velocity was low and groups weren't great. Tried different seating depths and powders. Tried the same load in a different gun with an 8 tw Brux and more FB and they shot 1/4 MOA at 200. Not sure if the first gun just doesn't like the bullet, or if it was a stability, or FB issue, but maybe a 131 HH would work better in a factory chambered barrel?
Douglas A. Twitty
Well-Known Member
I'm not sure, but I think my 700 has a 9 twist. I have not checked it, that's what various twist charts list. What's the best method to check it?
Thank You for the input.
Put a mark on your cleaning rod, push a patch through until the rod does a full rotation and then mark again, and measure the distance between the 2 marks. You might need to do it a few times to make sure you get the same number, sometimes it doesn't follow the rifling just right
MagnumManiac
Well-Known Member
A tight brush seems to work best for getting the correct rotation number.
Cheers.
Cheers.
MagnumManiac
Well-Known Member
My rifle started life as a 7RM, I re-chambered it after doing the blueprinting and truing. It also has a 264WM barrel on the same action.
The standard twist for the 7RM is 9.25", so it's gonna be either a straight 9", even though I am yet to find any rifles offered in 7mm with that twist, all have a 9.25" twist in the literature I can find.
Cheers.
The standard twist for the 7RM is 9.25", so it's gonna be either a straight 9", even though I am yet to find any rifles offered in 7mm with that twist, all have a 9.25" twist in the literature I can find.
Cheers.
Catbird
Well-Known Member
You've done the work on the action , now you just need a new barrel.
I assume you're 264WM is on a separate action , not some sort of switch barrel.
MagnumManiac
Well-Known Member
No, it's a switch barrel, as are most of my rifles. The beauty is that having a thick .250" pinned recoil lug, I can utilise the factory barrel if the threads need minimal work by adjusting the tenon length to suit the thickness of the lug.
Cheers.
Haven't ran it in my 7 STW but did work up a load in my 300 PRC with 220 ELDx had all kinds of pressure issues. When it gets close to maximum 1/10th of a grain took it from no pressure signs to flattened primer and bulge at the base no early warning signs
Gixxerbob what load?
H50bmg and 175 partitions, 215 match primer at 3.666 coal in 8mm rm brass. 84-86.5 grain ladder for testing. I typically shoot 86 grains at 3k fps at sea level but I wanted to run a ladder in the mountains this weekend.
I know 71.7 grains of 7828 behind a 175 eldx goes into the 3k fps but I want a partition or accubond bonded for this season. I was not impressed with the eldx last year.
I know 71.7 grains of 7828 behind a 175 eldx goes into the 3k fps but I want a partition or accubond bonded for this season. I was not impressed with the eldx last year.
