Barrel twist

[Deadeyejedi]

So I have a savage model 110 in .270 cal. My question is how do I know the barrel twist for this gun ? Does it depend on barrel length? Thanks.

 

[Reloadron]

No, barrel length doesn't figure in. You can look it up at the Savage site or....

Place a jag with a patch on a cleaning rod and start the patch in the barrel. Mark the rod and run it through till the rod rotates once. Mark the rod again. Remove the rod and measure between the marks that represent 1 full revolution.

Yours is likely a right hand 1 in 10 twist meaning 1 full rotation in 10". Typically stated as 1:10 twist.

Hope that helps...

Ron

 

[StandingTall]

More than likely it's a 1/10 twist. Looks like all Savage 110 .270s are. Barrel length doesn't factor in.

 

[Jim Watson]

Twist rate is one of the more overstudied things in the game.
If you are shooting a factory hunting rifle, you can expect it to be rifled to handle all standard hunting loads.
Most .270s have a 10" twist which works as well for 110, 130, and 150 grain bullets now as it did over 80 years ago. The only possible mismatch would be with a long lead free bullet.

 

[Deadeyejedi]

So how does it factor in to the hand loading equation ? Or does it ? A lot of times I see people list their barrel twist along with their favorite loads . Is it safe to assume an identical load would shoot better or worse depend on barrel twist?

 

[osteodoc08]

The longer a projectile, the more stablity it needs. Rifling provides stablitly by imparting spin. Too much and too little is a bad thing. Head over to berger's website and look at their calculators.

Generally, a heavier for caliber bullet will need more spin. You will see this debated hotly on an AR forum. 1:7 vs 1:8 vs 1:9. The 1:7 is excellent at stabilizing the heavier 75+gr Amax bullets where a 1:9 may not stabilize the bullet which can lead to wobbling, inaccuracy or keyholing.

 

[Jim Watson]

The only strong effect rifling twist has on reloading is how it determines the longest bullet you can use. Barnes lists their all-copper bullets up to 150 grains for a 10 twist .270, as does Berger with their needlenosed VLDs.

If you get into benchrest shooting, you will look for every little refinement.

 

[Reloadron]

So how does it factor in to the hand loading equation ? Or does it ? A lot of times I see people list their barrel twist along with their favorite loads . Is it safe to assume an identical load would shoot better or worse depend on barrel twist?

In a nutshell yes. Here are a few examples of Sierra .224 diameter bullets weighing 69 gn and 80 gn respectively. Note what Sierra has to say on the packaging.

69 GN. HPBT MATCH


80 GN. HPBT MATCH


Note the difference in the suggested twist rates. While both of these bullets shoot fine in my 1:7 twist barrels they suck in my 1:12 twist bolt gun in .223 with a 26" barrel. Thus when I load I load for either my bolt gun (55 grain and lighter) or for my 1:7 AR family I use the 69 to 80 grain bullets.

Ron

 

[Deadeyejedi]

Thanks for the very informative I will check all my rifles and make notes of it at the range