139gr bullet in 7mm rem mag.

[Bummy]

I picked up a box of Horandy 139gr SST bullets and was wondering if anybody has any experence with loading these bullets?
What loads would you recommend?

 

[dakotasin]

i used to shoot a lot of 139's out of my 7 rem mag... i finally standardized on 162's and have been happy w/ that.

for 139's, i would start w/ rl-22 and h-4831.

 

[lycanthrope]

I shot a bunch of 139gr Hornady out of the 7mag using IMR 4350.

 

[Wilburs Horse]

i used to shoot a lot of 139's out of my 7 rem mag... i finally standardized on 162's and have been happy w/ that.

for 139's, i would start w/ rl-22 and h-4831.

Why did you need such a heavy bullet. O'Connor advocated the 140gr. from most 7mm rifles.

 

[dakotasin]

ballistic coefficient.
its windy here, and prairie lends itself well to long shots that have to buck the wind.

accuracy.
i can keep tighter groups at any given range w/ the heavier bullet.

 

[redneck2]

Why did you need such a heavy bullet. O'Connor advocated the 140gr. from most 7mm rifles.

Kinda like the difference between throwing a ping pong ball and a golf ball. Same size around, but the wind will affect the golf ball a lot less.

Also, I suspect you'll have a lot of powder you really don't use with a 7 Mag. Light for caliber bullets don't need that much to get them moving.

It's not that they won't work fine, just depends on the application

 

[Wilburs Horse]

Kinda like the difference between throwing a ping pong ball and a golf ball. Same size around, but the wind will affect the golf ball a lot less.

Also, I suspect you'll have a lot of powder you really don't use with a 7 Mag. Light for caliber bullets don't need that much to get them moving.

It's not that they won't work fine, just depends on the application

Actually, the reasons bullets drift is more complicated than just sectional density. If read several good articles on the subject and am as baffled by the physics as most guys.

 

[dakotasin]

nevermind.

i shoot 162's and i like it!

 

[Wilburs Horse]

nevermind.

i shoot 162's and i like it!

Okay then. Have fun.

 

[redneck2]

My reply was the "Cliff Notes" version. You can do all the extended calculations but in the end, heavier bullets in a given caliber will typically drift less and carry better at long ranges

As an example...I have a Knight muzzleloader and a chart that shows relative trajectory. A .44 caliber 300 grain bullet shoots (barely) flatter than a 240 grain.

If you want to shoot 139's, have at it. If I were shooting paper at moderate ranges, varmints, etc. that's probably what I'd use. My 1,000 yard gun is a 7 mag and I'm using 162's YMMV