chambering tools question

**bushwackr** · 04-14-2014, 01:53 PM

Well i have decided that I am going to have my 300 wm turned, into a 6.5 300wm. I don't know what all is needed besides a barrel blank obviously. What tools will I need to find for the gunsmith. He has never made one, or does someone know ho makes a prefit barrel in this caliber

One more question what does every one think for twist for 130 and 140 gr pills. It looks like the round can throw a 140 vld 3300+. I appreciate everyones input

**stomp442** · 04-14-2014, 02:59 PM

Shilen can provide a prefit in that caliber but if you do end up having a smith build it you will need a reamer and go no go gauges. 270wsm gauges should work. You can get away with a 9 twist and a 140 bullet depending on your elevation and velocity but 8 twist is the more commonly used twist for the 6.5s.

I was only able to top out at 3200 in my 26" barrel and ended up having to back that off to around 3100 to get the accuracy I was looking for. I have since moved away from the wsm and built a 6.5-06 Ackley improved that achieves the same 3100+ much more efficiently. 59 grains of powder vs 67 in the wsm. Your results may vary good luck with your build.

the Ranger · 04-14-2014, 03:04 PM

he's not talkin' Short Mag, just Win Mag, the long one.

**yobuck** · 04-14-2014, 03:26 PM

I have a friend hunting in a camp near ours who has a 6.5 on the win mag case. Im sure he used an 8 twist.
For several years i had a 6.5 on the 270 wsm case in which i used 140 bergers with 63 gr h1000.
Velocities in both guns were pretty much equal as i recall. He went to lighter bullets for more velocity last time
i met up with him. Not a good choice for a gun that might see use past 1000 yds.

**bushwackr** · 04-14-2014, 03:45 PM

Yes it would be a .264 bullet in a necked down 300wm case. It would be purely a hunting rifle. I have both the 300 win mag and the 264 win mag and I like them both, I just figured it would be a super combination.