sideways bullet

[buckfever]

I'm having a problem with my 22 250 and the Nosler 52 gr Custom competion I'm using 35.5 grs of h380 wich is very accurite load but out of the 11 I shot 4 went through the target sideways this was at 100 yards the weather was upper 70s wind 5 to 10 mph and partly cloudy any ideas.

 

[Antelope_Sniper]

What's the twist of your rifling?

 

[JD338]

You have too slow a twist for that bullet.

JD338

 

[buckfever]

I forgot the rifle is a savge M12 twist is 1/12 I'v sent 85 of those 52 gr ncc down the barrel this is a first my load was 36.5 but 35.5 shot better so I went with that for the last 35 rounds.

 

[JD338]

Interesting, 1:12 twist is plenty fast for that bullet. Maybe copper fouling?

JD338

 

[Antelope_Sniper]

Or worn rifling at the muzzle?

 

[buckfever]

I just gave the bore a good cleaning and shoot it the morning and see what happens.

 

[RiverRider]

I have never understood why, but I got some 50-grain BTs to tumble when shot from a Model 70 in .223 Remington. My propellant was an overcharge of W748 (and there's a bit of a story behind how that took place) that was pushing the bullets well over 3500 fps. The tumbling was never a problem when the charge and velocity were within sane limits.

 

[Ol` Joe]

I`ve been driving the 52 gr Nosler CC at ~ 3100 fps from aWin 1885 high Wall in 223 with a 1/12 twist. Groups are averaging in the 0.5" to 0.6" mark for 5 rds.
I wouldn`t expect a 22-250 to have any trouble stabilizing them.

 

[Antelope_Sniper]

There's been some interesting studies on rifling. One of the old question has been, is there a benefit to increasing the twist rate at teh end of the barrel. Although I don't remember for sure, I think it was the boys at Lilja or Kriger that did this study. During the study, they found there was no benefit to increasing the twist rate at the end of the barrel. However, if the rifleing rate SLOWED at the end of the barrel, the bullet would become unstable. In addition, if you bored the rifling out at the last few inches of barrel (I think they bored out the last 6 inches of a rifle barrel) the bullet would also become unstable. On the other hand, if you only rifled the last 6 inches of barrel with a proper twist, the bullets would stabilize just fine....

So, if the rifling is insuffficent at the muzzle, or if you rifling twist is not even, but slows toward the muzzle, you coudl shoot sideways bullets.

 

[buckfever]

well I shot it saturday and it shoot as good as the wind would let me shoot and no sideways bullets so JD338 must of been right about copper fouling I'v never had that happen before but thank you everybody for all the help.