Well, I tried 4831SC for the 270

[atblis]

Started at 55gr WLR with a Sierra MK 135 in Winchester brass, OAL of 4.317

1st group 55 gr Nothing Spectacular
2nd group bumped powder up ~.5gr Nothing Spectacular
3rd group more powder Nothing Spectacular

4th group

Looks Good so I load up three more and it shoot this

Starting to look really good so I load up my last four cases with the same load, and it shoots this

Hmmmmm, one really bad flyer. Didn't feel like a shanked shot on my part. Other than that flyer, it's the tightest group yet.

Okay, so what I am wondering is, what things should I be looking for when culling brass? I am suspecting the brass.

 

[USSR]

atblis,

Any idea what velocity you are getting? I have never been able to get suitable velocities out of H4831SC in either 6.5x55 or .30-06 with heavy bullets, so I doubt you are getting much out of your .270 with light bullets. I would suggest a 4350 burn rate powder (RL19, N160, H4350, etc.).

Don

 

[atblis]

Well

2800 fps ~10ft from the muzzle.
That's ~4gr below the published max.

I am pretty sure it'll get 3000fps or more. I was just working for accuracy.

 

[The Bushmaster]

I love it when it all comes together. I get at or above book fps using 165 grain Sierra HPBT and 180 grain Sierra SPBT out of my .30-06 using H4831SC. In fact. I've been loading down to 2500 fps for those close shots under 100 yards. Not sure why I do that...Just wierd I guess.

Looks real good atblis. Just got a little wrinkle to iron out. Or just one of those freaky things that ocasionally cause a flier.

 

[ranger53]

Ditto on the 4350. I've been getting better groups with the 4350 than the 4831.
tommy

 

[atblis]

Yeah

THe gun did very well with 4350 previously. Just wanted to try something else. As of right now the 4831SC is looking promising.

I was trying to figure out why the point of aim shifts a little. I think it has to do with the fact that I didn't put the target level, but still intersected the points of the diamonds with the cross hair.