Savage 12LRP, 260 REM load fine tuning

[SAVAGE22-243AI]

4831 SC with a magnum primer worked for me. I also had great luck with the 123 A-Max for a 1580 yd Prairie Dog kill in WY last year. I know it just doesn't "BC" out, but the 140 A-Max and 142 SMK just stayed in the air too long and ended up drifting way of target in a 4-5 mph wind at that distance.
At 1000-1200 yds my 140 A-Max and 142 SMK were great.

Using a Savage target action, Walther 28" barrel .260 Rem match chamber 1-8 twist.

In my rifle the 142 SMK, 140 JLK's and 123 A-Max worked out the best.

[freeflight]

Originally Posted by SAVAGE22-243AI

4831 SC with a magnum primer worked for me. I also had great luck with the 123 A-Max for a 1580 yd Prairie Dog kill in WY last year. I know it just doesn't "BC" out, but the 140 A-Max and 142 SMK just stayed in the air too long and ended up drifting way of target in a 4-5 mph wind at that distance.
At 1000-1200 yds my 140 A-Max and 142 SMK were great.

Using a Savage target action, Walther 28" barrel .260 Rem match chamber 1-8 twist.

In my rifle the 142 SMK, 140 JLK's and 123 A-Max worked out the best.

wow, that is a long shot. I know it might not work for me, but still curious to know your A-max 140gr load.

[SAVAGE22-243AI]

I started with 44 grs of H 4831 SC, and worked up to maximum load, then back off. Start with above and work up 1/2 gr at a time to you max.
I ended up with 46.3 but this won't work in your gun without testing first.
My 123 A-Max I ended up with 47.2 gr H 4831 SC, again work up before trying in your gun.

Does your barrel have standard throat or long throat for 140 gr bullets? This can cause pressure issues if it is short chambered for lighter bullets.

[freeflight]

Originally Posted by SAVAGE22-243AI

I started with 44 grs of H 4831 SC, and worked up to maximum load, then back off. Start with above and work up 1/2 gr at a time to you max.
I ended up with 46.3 but this won't work in your gun without testing first.
My 123 A-Max I ended up with 47.2 gr H 4831 SC, again work up before trying in your gun.

Does your barrel have standard throat or long throat for 140 gr bullets? This can cause pressure issues if it is short chambered for lighter bullets.

Thanks. I think it has long throat for the long 140r bullets. My COAL is 2.256" off ogive, which is 0.01" off the land.

I played with several COAL (0.005" and 0.015 off land) for my 46.8gr load, didn't get any improvement.

[SAVAGE22-243AI]

Are you using Magnum primers? I use the CCI 250, back off one grain with mag primer and try that. Also seat bullet long and push into rifling on a couple. Your group should touch each other or one hole at 100 yds. If not check your twist in barrel with tight patch on cleaning rod and count twist.
If it won't group, go to different powder. I also used Varget, and Reloader 22.

[freeflight]

Originally Posted by SAVAGE22-243AI

Are you using Magnum primers? I use the CCI 250, back off one grain with mag primer and try that. Also seat bullet long and push into rifling on a couple. Your group should touch each other or one hole at 100 yds. If not check your twist in barrel with tight patch on cleaning rod and count twist.
If it won't group, go to different powder. I also used Varget, and Reloader 22.

I was using LRP 210M, could try 215M next time. I normally have 3 shot in 0.2MOA, next two opens the group up to 0.5MOA.

[SAVAGE22-243AI]

Shoot 3 shot groups only, then move to new target for another 3 shot group.