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7mm rem mag twist

Sako Collectors Club Discussion Forum

For 7mm Rem Mag 1:9.5 for 24" inch barrel length. For 7mm Wby Mag 1:10 for 26" barrel.

These are considered common.
 
Not to be contrary, but I still maintain that measured and repeatable twist rate is the definative answer. Dick
 
hayseed51 said:
Not to be contrary, but I still maintain that measured and repeatable twist rate is the definative answer. Dick
I agree. Sako twists are in metric, not English, units. They usually fall somewhere "in the vicinity" of an even inch measurement, but I've measured them all over the place. Published twist rates are often erroneous, even those publish by Sako's official importers.
That said, I've never found a Sako barrel that did not have a twist rate appropriate for its intended use.
 
Dick,
So. do you recommend like doing 10 or so and take the average? I think I hear you saying they may not come up the same every time? Makes sense to me, but does that mean you can't always count on the factory spec? Like advertised gas mileage on a car? LOL
Thanks,
S-A
 
Stonecreek,
I guess on the newer models they must have made the conversion on the tech sheets in inches, but back in the day, those kinds of things were probably only in the minds of the guys who do a lot of handloading. That thought hadn't crossed my mind on the say, pre-72's.
Guess I'll be doing some experimenting today.
Thanks,
S-A
 
S-A

I guess the way I go about it is to fiddle around with the combination of brush/jag and patch size until I find a combination that engages the lands well, but also allows the rod to advance pretty smoothly. It seems like that fittment is the key to repeatability. A few other things I pay attention to - Barrel needs to be clean. Make sure whatever type of tip you're using is tight. I advance the rod in 3-4" past the throat before starting to measure. Never grasp the shaft, only the bb handle. Good light and a cleaning cradle are helpful.

When you get your fittment and technique ironed out, repeatability comes naturally. You should be able to shove 3 in a row through that measure within about 1/4". At that point, I'm satisfied, and jot it down in the loading log.

While I do think the twist rate is worth knowing, and take the time to measure, I also recognize in most cases it's sort of a moot point. As Stonecreek mentioned, where the rubber meets the road is how they shoot. Only in the case of some of the ultra-long VLD target bullets, or some of the heaviest mono-metals might it be a concern. Even then, what might seem questionable often seems to shoot pretty well... Dick
 
Thanks Dick,
I guess that should bring the original question full circle (no pun intended). The only rifle I pay attention to on twist is my TRG 42. Remarkably, the Lapua 250 gr. Scenar is more stable than the 300 gr. Scenar at long ranges. I attribute this to the twist.
S-A
 
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