keyholing problem using light loads?

[paulnyc]

I am using light loads of various powders, Viht 140, H380 and Varget all using Sierra 55gr Blitzkings. Bullets seem to be tumbling a little, not real keyholing but the holes are a little oval shaped - groups at 100 yards are horrible.

I had some Nosler 50 grain spitzers with N135 powder and these shot perfectly -

Is it the powder? The bullet? Any help or suggestions would be greatly appreciated!

Thanks!!

 

[kentuckytroutbum]

Paul-
You didn't say what caliber, rifling twist, and muzzle velocity that you are using. Could you furnish that information and hopefully we can help you.

Could be a bad batch or bullets (rare, but it does happen)?
Could be at too low a velocity to adequately stabilize the bullet?

 

[paulnyc]

shooting a remington 22-250 VTR -

 

[cmillard]

must have the rate of twist--sounds like the bullets are not being stabalized

 

[CJ6]

Could be too light/slow for the bullet /twist

 

[RJinTexas]

In the 22-250: 38.0/H380 has long been noted as the std accuracy load with 52gr bullets in a 14tw, this powder charge seems to work with most bullets from 50 to 55 graines.

Regards
RJ

 

[MJC]

I am using light loads of various powders, Viht 140, H380 and Varget all using Sierra 55gr Blitzkings. Bullets seem to be tumbling a little, not real keyholing but the holes are a little oval shaped - groups at 100 yards are horrible.

I had the same problem with the 50 grain Blitzkings in a 1-12 twist .223 with normal loads. I called Sierra and they suggested trying the 55 grain Blitzkings. I never did try any more Blitzkings but settled on Hornady 50 grain V-Max.

 

[paulnyc]

I called sierra and they said that the only bullet not stable in a 1:14 twist is the one i bought - the 1455C 55 grain blitzkings. Now I have 475 bullets with no home!