halfbakedi420

wondering what the best twist for a 243 is. (running factory ammo vs making your own)

streetglideok

I'm not well versed on the 243/6mm guns, but it brought back a memory. 1:9-1:10 twist would be ideal for the heavier bullets for big game hunting. Faster twists, where the two numbers are closer together(1 turn every 9", vs 1 turn every 10" for example) stabilize longer bullets better then slower twists. Longer bullets normally means heavier bullets. No-lead bullets, lacking the mass of lead inside them, are longer for a given weight however. A 100gr barnes all copper bullet may be as long as say, a 120gr regular bullet, for instance.

A caliber that came out as a rival to the 243 was the 244 remington. Same bullets, but based off the 257 roberts, not a 308. Held a little more powder, etc, but remington goofed when they used a 1:12" twist. It couldn't stabilize heavy bullets well enough, so accuracy suffered on deer class bullets. Remington revised it, and used a 1:9" twist, and called a 6mm remington, but the damage was done. The 243 had a better twist rate out of the gate, and left the remingtons in the dust. So, based off that reading, if you are doing deer hunting, 1:9-1:10. If you are going to varmint hunt with it only, 1:10-1:12. Maybe the experts of this caliber will chime in more.

Sheridan

Hope this helps;


http://www.varminthunters.com/tech/barreltwist.html


http://www.riflebarrels.com/products...wist_rates.htm

jeepkid

My .243 AI sports a 1/8 and I had it built around the 105 gr Berger VLD. A 1/7 is preferred for the 115's but my 1/8 still shoots them fine. Factory rifles come with a 1/9 I believe and would work well up to 95gr VLD's and just about any hunting bullet up to 105 gr...

stapher1

I'm using a 1:10 on my 6br now, which standard twist. But i'm thinking about building another 6br with a 1:8 twist for 105-115gr bullets.

stapher1

Even so, the 1:8 is still recommended twist over a 1:10 by benchrest shooters for bullets over 95grs. Which i kick my a** for not going 1:8 for the 6br in the first place. But Rem's factory twist rate is 1:9.1/8 so it's not that big of a change

dylan_b

my 243 has a 1-10 being a factory barrel. it does NOT stabilize any of the 105+ grain vld style bullets but it does work extremely well with 80 grain pills. if your planning on using a 1-10 barrel make sure you want a varmint rifle and just that. yes regular flat base spitzers shoot well from the rifle but considering the capability that a 243 has with vld's, you might as well go with a 1-8 twist. i honestly dont think a fast twist barrel is going to shoot out, warm up or build chamber pressure any faster then a equal quality barrel outside of a lab testing.