Sako S20 7 rem mag

[rharfo]

Who has one? Will it stabilize 175/180gr boolits? The 1.9.5 twist should not but hoping it can handle the heavies.
Thanks Sako owners in advance for chiming in.

 

[Hoss50]

I don't have the 7mm, but I have the 300 win mag S20 Precision and really like it. It is shooting .5moa or less with some of the just brake in loads with 208gr Berger LRHT.

 

[rharfo]

I don't have the 7mm, but I have the 300 win mag S20 Precision and really like it. It is shooting .5moa or less with some of the just brake in loads with 208gr Berger LRHT.

What is the twist rate on your 300?

 

[Hoss50]

What is the twist rate on your 300?

1:10 twist

 

[Bob Wright]

Most Sakos have that slower twist. I believe Sako was targeting these rifles for lighter bullets. My 7RM with a 9.25 twist would keyhole the 175 Barnes LRX at 100 yards. Just look at a stability calculator for your twist and bullet. It doesn't really matter who made the rifle.

 

[rharfo]

Most Sakos have that slower twist. I believe Sako was targeting these rifles for lighter bullets. My 7RM with a 9.25 twist would keyhole the 175 Barnes LRX at 100 yards. Just look at a stability calculator for your twist and bullet. It doesn't really matter who made the rifle.

The Berger stability chart shows 175/180 marginally stable. But I think actual results would be more in line with yours.

 

[hunter0528]

Here is a chart I found interesting re the Twist rate by different Manfactures

GS CUSTOM USA - Twist Rate by Manufacturer

GS Custom Bullets - Twist Rate by Manufacturer

www.gscustomusa.com

Small Example

TWIST RATE BY MANUFACTURER


This is a partial list. If you know of a manufacturer that should be on the list, please send us a link,
so that we can include it.

Cartridge​	Twist Rate​	Manufacturer​
Millimetres​	Inches​
​

308 Winchester​	254​	10​	Colt; J.C. Higgins 51-L; Mannlicher Shoenauer; Marlin 455; Musketeer; Remington 722, 740, 742, 760, 700, 40-XB, 788, 660, 600, 7400, 7600, Four, Six, Seven; Schultz & Larsen; Ruger; Wichita; Savage 99, 110, 112, 116 (present); Weatherby Vanguard; Steyr SSG-PIV; T/C Rifle; T/C Venture​
308 Winchester​	279​	11​	Blaser; Sako 75 / 85​
308 Winchester​	305​	12​	Browning 81 BLR, BAR Mark II, A-Bolt II; Colt; FN; High Standard; J.C. Higgins 50, 51, 51-L; Harrington & Richardson 300, 308; Husqvarna; Mossberg 800; Savage 99, 100, 110, 2400; Sako Bolt Action and Lever Action (old); Winchester 70, 88, 670, 770; Steyr SSG-PI, PII, PIII; Stevens 110, 100; Remington 700, 40-XC.; Springfield Armory M1A; Zastava; Baikal O/U​
30-06​	254​	10​	Browning 81 BLR, BAR Mark II, A-Bolt II; Colt; FN; High Standard; J.C. Higgins 50, 51, 51-L; Harrington & Richardson 300; Mannlicher Shoenauer; Marlin; Musketeer; Remington 721, 725, 740, 742, 760, 700, 40-XB, 7400, 7600; Schultz & Larsen; Ruger; Wichita; Savage 110, 114, 116 (present); Sako (old); Weatherby Vanguard, Mark V; Stevens 110; Winchester 70, 670, 770; Mossberg; Magnum Research Mountain Eagle; Thompson/Centre Rifle; T/C Venture; Zastava; Baikal O/U​
30-06​	279​	11​	Blaser; Sako 75 / 85​
30-06​	305​	12​	Husqvarna; Remington 700 Varmint (old); Browning 78; Sauer 90​

 

[VTbluegrass]

From when I had a Montana Rifle in 7RM that was a 9.5 twist I recall the 175 Partition/Gram Slam (short flat base bullet) would stabilize but not a heavier monometal or Bergers.
Don't let that discourage you though the 160-168's Bergers/ELDs/etc. have legs to reach out there too and still arrive with authority.

Not sure about the Sako magazine box but you may be limited there too if the magazine length starts forcing the bullet into the powder space.

 

[rharfo]

From when I had a Montana Rifle in 7RM that was a 9.5 twist I recall the 175 Partition/Gram Slam (short flat base bullet) would stabilize but not a heavier monometal or Bergers.
Don't let that discourage you though the 160-168's Bergers/ELDs/etc. have legs to reach out there too and still arrive with authority.

Not sure about the Sako magazine box but you may be limited there too if the magazine length starts forcing the bullet into the powder space.

According to their marketing the mag is extended for reloading. I have a bunch of 180's.

 

[MOA or bust]

Post #5 says his 9.25 twist 7 RM keyholes 175 gr Barnes LRX bullets. I don't believe Barnes makes a 175 LRX in 7mm, but the 168 gr Barnes LRX keyholes in my 7RM with 9.25 twist (but the 145 LRX shoots great). Most LR bullet makers now list what twist is needed to stabilize.

 

[Hoss50]

According to their marketing the mag is extended for reloading. I have a bunch of 180's.

The 300wm is 3.6" max OAL. Booknis 3.34", so it is a nive upgrade to 3.55-58 type range. Not sure on 7RM.

 

[Bob Wright]

Post #5 says his 9.25 twist 7 RM keyholes 175 gr Barnes LRX bullets. I don't believe Barnes makes a 175 LRX in 7mm, but the 168 gr Barnes LRX keyholes in my 7RM with 9.25 twist (but the 145 LRX shoots great). Most LR bullet makers now list what twist is needed to stabilize.

Yes, it's a 168 Lrx. My mistake.