9 twist 7mm

[cgpaul]

Anyone using this rate when shooting 180 Sierra MK`s? I`m having accuracy issues with my 7 Wby. and wondering if the 9 twist may be the problem.

Thanks

 

[roninflag]

what barrel/rifle??

 

[jcann]

I shoot 180gr Bergers in a 8.7 twist Bartlein barrel with great results. Your 9 twist shouldn't be the problem.

 

[MudRunner2005]

I shoot 180's in a 9.25" twist with no issues. But my 9.5" twist rifles refuse to even get close to stabilizing them.

 

[idaho elk hunter]

Sierra recommends a 1 in 8 twist. The 1 in 9 will work if you push them somewhat hard but they will stabilize at long distance quicker than if you run the 1 in 8.

 

[cgpaul]

Thanks Guys, I have built the 7 Wby on a 700 action, and had wanted an 8 twist in the barrel I ordered. Come to find out, the barrel was cut 1x9....I didn`t think to check it when she came in.
It shoots 175 Sierra GK at 3020fps extreamly well, 1/2 MOA, and maintains the accuracy out to 500 yrds, furthest I`ve tested it. Problem comes with the 180`s. .75 inches at 100, but as distance increases, so does dispersion, shooting more than MOA. And I`ve tried everythink I can think of to correct...seating depth, powder, primers, cases etc. I`ve also noticed any VLD type bullet, Sierra, Burger, JLK`s respond the same way. I really can`t put a finger on it, other than every rifle is unique. Built the gun for some LR stuff...quess I`ll just stick to the 175`s and 160 Accubonds.
Thanks.

 

[MudRunner2005]

Have you tried the Berger 180 Hybrid? My 7mm STW eats them up.

 

[cgpaul]

No. In fact waiting for some 175 LR Accubonds to show. Had them on order from Midway sence Jan.
Where are you getting the Hybrid`s?

 

[MudRunner2005]

No. In fact waiting for some 175 LR Accubonds to show. Had them on order from Midway sence Jan.
Where are you getting the Hybrid`s?

Either local store, or some random places online. Last time I found some, I bought 5 boxes, so I'm good to go for a while.

They're hard to find these days, so you just gotta keep a constant watch for them.

 

[IAHNTR]

No. In fact waiting for some 175 LR Accubonds to show. Had them on order from Midway sence Jan.
Where are you getting the Hybrid`s?

3rd gen has 257 boxes.

.284 180 GR MATCH TARGET HYBRID BERGER 100 CT

 

[cgpaul]

Thanks for the info on 3rd Gen. Didn`t know they existed....just ordered some 180`s.

 

[cgpaul]

Well, just recieved my 7mm 180 Berger Hybrid`s, and was able to shoot a load with H1000 last nite at 300. 1.75 inch 3 shot group. Looks promising. Now on to 4, 5, then 600. If they stay well under MOA, I`m a happy camper.
I`ll keep you posted.

 

[DropDead]

For reference Sierra recommends at least 1 in 8 twist for their 180 smk, where as Berger recommends 1 in 9 for their 180 VLDs. My Criterian 7RM 1 in 9 twist barrel loves the 180 vld's, i havent tried 180 smks or berger hybrids. My personal best 3 shot group to date at 500 yards with 180 vld is 5/16" most groups under 2". I may try the 180 smk sometime, if i could get them to shoot 1/2 moa it would be worth it for the savings that sierra offers in 500 round boxes. For target shooting that is, will stick to berger vld hunting for hunting.

 

[cgpaul]

Sorry for the delay, been gone for a bit.
Got a tip from a mamber to try 3RD Generation, they had some.
Shot my load yesterday at 400...2.25 inch groups. Showing promise.