Twist Rates for 7mm RM
- Thread starter cjs88
- Start date
I use a 1-8 for my 7 saum.
I do blow up occasional 180 eldm’s though.
Subsonic stability with 180 and 190’s seems really good.
8.4 seems like a great compromise.
1-9 for sure with lighter bullets.
I do blow up occasional 180 eldm’s though.
Subsonic stability with 180 and 190’s seems really good.
8.4 seems like a great compromise.
1-9 for sure with lighter bullets.
For 160's the Remington standard of 1-9.25 is fine. I was very successfully with 168 & 175 gr SMK from a 1-9.25 twist. Heavier bullets and long VLD's are available for the 7mm are where faster twists are needed.
A 1-9 will handle up to 180gr bullets with no problem. My 284win F class gun I’ve shot plenty of 180 VLD’s and 183SMK’s with no issues. The gun still holds a local clubs mid range f class record.
Up to the 195gr bullets I‘d go 1-8.5 twist.
Later, Frank
Bartlein Barrels
Up to the 195gr bullets I‘d go 1-8.5 twist.
Later, Frank
Bartlein Barrels
I use to see a few 9-8.7 gain twists for F class before the 195berger showed up is that still a good option for medium bore 7mm with 180's. Is this still common?
Thanks in advance
I thought that the full BC the 195 is capable of required a 1 in 8, but my 8.5 stabilizes them fine. I have a 1/8.5 Bartlein and it shoots the 180s great.
Guys are still running the GT as well. What guys are shooting etc....kinda makes what they want for the twist all over the map.
The key to shooting a lighter bullet/shorter oal bullet length in a faster twist barrel is to shoot good quality bullets and ammo with little run out. Crappy bullets and or ammo that has a lot of run out then a faster twist will amplify the wobble per say and that’s where it causes accuracy issues.
Mine's a 1/8.5 Bartlein. Shoots the 180's great. Haven't tried the 195's yet, questionable on if they will be fully stabilized depending on how fast you can push them with a RM case and how long of a barrel you got. But I'm able to push the 180's at 3050 right now.
I just ordered a 1-8.5" twist brux for a hunting rifle that will be chambered in 280 AI. I tend to shoot heavy for caliber so I don't have to worry about spinning light bullets too fast and blowing them up. Since I live in the midwest and hunt in the winter the air tends to be heavy so a little extra spin is not a bad thing ballistically.
My next 7RM barrel will be 1 in 8. I see no reason to shoot the lighter bullets given how awesome the heavies are.
