Fast twist Swift?

HighWall · #1 01-20-2008, 02:23 AM

I am putting together a 9" twist .220 Swift. Anybody else shooting one? Im planning on using the 75gr AMAX.

dirtball · #2 01-20-2008, 07:05 AM

With a 9 twist you may not be able to stabilize the 75 gr. The note on the end of the 75gr A-Max's I have says "for 8 twist barrels" as does the Berger 80gr and the SMK 80gr. If you want to shoot the heavier 22 cals you might want to go to an 8 twist, if you go to 90gr you will want a 7 twist.

Dave

Varmint Hunter · #3 01-20-2008, 07:39 AM

Quote:

Originally Posted by dirtball

With a 9 twist you may not be able to stabilize the 75 gr. The note on the end of the 75gr A-Max's I have says "for 8 twist barrels" as does the Berger 80gr and the SMK 80gr. If you want to shoot the heavier 22 cals you might want to go to an 8 twist, if you go to 90gr you will want a 7 twist.

Dave

Bullet manufacturers are rather conservative with their recommendations, especially Hornady who always seems to suggest a faster twist than will be needed under most circumstances.

The 9" twist will be fine for the 75gr A-Max. An 8" twist would be better for the 80's and would probably even work for the 90gr in your Swift. I'm sure a few guys here have shot the 90 grainers. Let's see what they used.

Rimfire · #4 01-20-2008, 09:28 AM

The 90 SMK's worked well in an 8 twist out to 800 yards then fell apart. Great results on speed goats out of a 223 WSSM. The next ones were being tested on 7's

HighWall · #5 01-20-2008, 02:14 PM

Im using a 9" twist Savage .223 barrel (new), rechambered to Swift. Hope to have it up and running next week.

goodgrouper · #6 01-21-2008, 08:39 PM

Quote:

Originally Posted by dirtball

With a 9 twist you may not be able to stabilize the 75 gr. The note on the end of the 75gr A-Max's I have says "for 8 twist barrels" as does the Berger 80gr and the SMK 80gr. If you want to shoot the heavier 22 cals you might want to go to an 8 twist, if you go to 90gr you will want a 7 twist.

Dave

I think the newer made Hornady 75 amax are rated for a 9" twist. They used to be for an 8". But I still prefer an 8" twist barrel so you can shoot a wider variety of VLD bullets.

wildcat · #7 01-23-2008, 09:27 PM

I would listen to GG and go with the 1-8 twist.