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Savage 12LRP, 260 REM load fine tuning

 
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  #1  
Old 03-08-2013, 02:21 PM
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Join Date: Apr 2012
Location: SoCal
Posts: 43
Savage 12LRP, 260 REM load fine tuning

Hi there,

When breaking in the barrel, I found a load with NCC 140gr, 451.gr H4831SC, sub 0.5MOA, 2716 fps, STD 9 fps, ES 22 fps. But NCC 140gr has a lower BC than I like. My goal is have a load for one thousand yard or further. So I continued to search for a high BC, high velocity, low ES load.

I started with A-max 140gr 0.01" off the land, H4831SC, 210M, new Remington brass. The best load I found so far is 46.8gr H4831SC, compressed powder. 5 shots group is about 0.563-0.627MOA. Velocity 2833fps, STD 14fps, ES 37 fps. There is definitely room for improvement.

What bothers me most is first three shots usually group about 0.2MOA, the next two shots open the group up. I would also like to reduce the ES. They are fired in about 2 minutes. There isn't much room in the case to increase the charge.

Any suggestion to fine tune the load is appreciated.

Thanks,
Kevin
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  #2  
Old 03-08-2013, 09:10 PM
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Join Date: Jan 2013
Location: Denham Springs,Louisiana
Posts: 161
Re: Savage 12LRP, 260 REM load fine tuning

Quote:
Originally Posted by freeflight View Post
Hi there,

When breaking in the barrel, I found a load with NCC 140gr, 451.gr H4831SC, sub 0.5MOA, 2716 fps, STD 9 fps, ES 22 fps. But NCC 140gr has a lower BC than I like. My goal is have a load for one thousand yard or further. So I continued to search for a high BC, high velocity, low ES load.

I started with A-max 140gr 0.01" off the land, H4831SC, 210M, new Remington brass. The best load I found so far is 46.8gr H4831SC, compressed powder. 5 shots group is about 0.563-0.627MOA. Velocity 2833fps, STD 14fps, ES 37 fps. There is definitely room for improvement.

What bothers me most is first three shots usually group about 0.2MOA, the next two shots open the group up. I would also like to reduce the ES. They are fired in about 2 minutes. There isn't much room in the case to increase the charge.

Any suggestion to fine tune the load is appreciated.

Thanks,
Kevin
Kevin, you may want to try H-4350 as it may be better for velocity although you dont have to have a lot of velocity to get you to 1000 yds. It may even give you at least or better accuracy. The 130 gr. bullets will also get the job done at that range. If your group opens up as you say you may look at tweaking the bedding screws some. Start out with 40 in. lbs. on all three. Also make sure the rear tang is free floated as well as the barrel after the third shot. It could be as simple as that. If the barrel is touching anywhere, the shot will go off in the opposite direction of the pressure point. ( left pressure, right bullet strike). If you change components,change only one at a time. ( process of elimination). Hope this helps. ..... SEMPER FI!
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  #3  
Old 03-08-2013, 09:22 PM
Silver Member
 
Join Date: Jan 2013
Location: Maple Valley, Washington
Posts: 456
Re: Savage 12LRP, 260 REM load fine tuning

I have that same rifle. There is a barrel timing node for 140 gr bullets right around 2,700 fps and they shoot great there. The first thing I would do is assess the barrel timing of your other loads and tweak them to be on a node. That typically eliminates flyers and cuts group size in half. For the theory behind this, check out Chris Long’s website and his OBT paper.

http://www.the-long-family.com/
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  #4  
Old 03-08-2013, 09:57 PM
Bronze Member
 
Join Date: Apr 2012
Location: SoCal
Posts: 43
Re: Savage 12LRP, 260 REM load fine tuning

Quote:
Originally Posted by Sargesniper View Post
Kevin, you may want to try H-4350 as it may be better for velocity although you dont have to have a lot of velocity to get you to 1000 yds. It may even give you at least or better accuracy. The 130 gr. bullets will also get the job done at that range. If your group opens up as you say you may look at tweaking the bedding screws some. Start out with 40 in. lbs. on all three. Also make sure the rear tang is free floated as well as the barrel after the third shot. It could be as simple as that. If the barrel is touching anywhere, the shot will go off in the opposite direction of the pressure point. ( left pressure, right bullet strike). If you change components,change only one at a time. ( process of elimination). Hope this helps. ..... SEMPER FI!
H4350 is the go to poweder for 260, but all I have are Varget and H4831SC. I haven't touch the action screws yet, hoping I don't have to. Will definitely check the barrel after three shots. Thanks.
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  #5  
Old 03-08-2013, 10:11 PM
Bronze Member
 
Join Date: Apr 2012
Location: SoCal
Posts: 43
Re: Savage 12LRP, 260 REM load fine tuning

Quote:
Originally Posted by Engineering101 View Post
I have that same rifle. There is a barrel timing node for 140 gr bullets right around 2,700 fps and they shoot great there. The first thing I would do is assess the barrel timing of your other loads and tweak them to be on a node. That typically eliminates flyers and cuts group size in half. For the theory behind this, check out Chris Long’s website and his OBT paper.

http://www.the-long-family.com/
Thanks for the link and information about timing node. I never heard about such thing, will study it. I will use the excel sheet or search online for the higher velocity nodes.

I was thinking about change COAL to 0.02" or 0.005" to tune the load.
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  #6  
Old 03-08-2013, 10:15 PM
Silver Member
 
Join Date: Jan 2013
Location: Denham Springs,Louisiana
Posts: 161
Re: Savage 12LRP, 260 REM load fine tuning

Quote:
Originally Posted by freeflight View Post
H4350 is the go to poweder for 260, but all I have are Varget and H4831SC. I haven't touch the action screws yet, hoping I don't have to. Will definitely check the barrel after three shots. Thanks.
Have not tried VARGET as of yet. So many powders to play with, i have not tried all of them as i haven't had my .260 very long. I can tell you this though. If you try to gain 6.5x284 velocity(and you can),your barrel wont last long. I had a 6.5x284 that went south in only 750 rounds. It too was a Savage F-Class 30" BBL. I rebarreled to the .260 with a 30" Bartlein Heavy 1-8.5" twist. I have gotten on one load with a 140 gr. bullet up to 2950 but do not want to push it that fast. A 140 gr. at 2750-2800 is plenty fast enough for 1000 yds. if you get the accuracy from it. Good luck and shoot bug holes. ..... SEMPER FI!
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  #7  
Old 03-08-2013, 11:51 PM
Bronze Member
 
Join Date: Apr 2012
Location: SoCal
Posts: 43
Re: Savage 12LRP, 260 REM load fine tuning

Quote:
Originally Posted by Sargesniper View Post
Have not tried VARGET as of yet. So many powders to play with, i have not tried all of them as i haven't had my .260 very long. I can tell you this though. If you try to gain 6.5x284 velocity(and you can),your barrel wont last long. I had a 6.5x284 that went south in only 750 rounds. It too was a Savage F-Class 30" BBL. I rebarreled to the .260 with a 30" Bartlein Heavy 1-8.5" twist. I have gotten on one load with a 140 gr. bullet up to 2950 but do not want to push it that fast. A 140 gr. at 2750-2800 is plenty fast enough for 1000 yds. if you get the accuracy from it. Good luck and shoot bug holes. ..... SEMPER FI!
Right, I would be happy with 2750 to 2800 fps, but I just haven't found any accurate load in that range.
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