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375 RUM and the 260 Accubond...

 
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  #1  
Old 11-25-2013, 09:49 AM
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375 RUM and the 260 Accubond...

Hey guys and gals,

I have heard now from a couple of you how devistating the 270 tsx is in this caliber, but I just love the BC of the 260 Accubond. Soo, has anyone developed a long range, "killer " load for this combination? In doing research, my heart leads me to IMR 4350 because of the velocities its showing (3026) however, I know 4831 in hodgon and IMR are very close seconds. Is there a powder that anyone has tried other than the powders listed? I am shooting a 26 inch factory barrel.
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Old 11-25-2013, 11:00 AM
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Re: 375 RUM and the 260 Accubond...

I use IMR 4350- 96 gr w/ rem 9.5M. Wonderful load. However; I would be curious about RL17 or maybe 19. I didn't get the velocity listed w/ H4831 or IMR7828. 4350 was as advertised for me.
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Old 11-25-2013, 02:34 PM
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Re: 375 RUM and the 260 Accubond...

Interesting...I shoot 7828 out of my 7 RUM and 338 RUM with unyielding success. Accurate, consistant charges that shoot and ignite very well. I'm not suprised that 7828 isn't the answer in this caliber. I think it is just too darn slow of a powder. However, 19 and 17 might be something to try...

Last edited by Doublezranch; 11-25-2013 at 04:23 PM.
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Old 11-25-2013, 02:53 PM
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Re: 375 RUM and the 260 Accubond...

I shoot the 260AB in a 375 Ruger from a Savage 116 with a factory custom 26" barrel. 79.5grs of WW760 yields 3022fps with absolute max pressure (Pressure Trace II says 62kpsi). For this much powder I always use a Fed 215 LRM primer. My son gets top velocities out of 7828 in his 300 WinMag but RL 19 has proved very promising in his gun. As the 300 WinMag has a bore ratio closer to the 375 RUM I would try that powder. It has a high energy density and the burn rate is very close to 4831/7828.
Since my rifle is generating similar velocity to yours the load you are using is not optimum. Try a different powder and switch to the Fed 215LRM primer. They make it in a match version also I believe.
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Old 11-26-2013, 10:01 AM
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Re: 375 RUM and the 260 Accubond...

DoubleZRanch- yes 7828 works well in my 7 rum with 140's as well. I like RL25 in my 300 rum w/200's.
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Old 11-26-2013, 03:07 PM
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Re: 375 RUM and the 260 Accubond...

Quote:
Originally Posted by mrultramag View Post
DoubleZRanch- yes 7828 works well in my 7 rum with 140's as well. I like RL25 in my 300 rum w/200's.
I shoot half inch groups at 300 with 7828 in my 7 RUM and get the same or better performance with my 338 RUM with 7828. There is no way I am changing their loads. Way too accurate. I am trying to put together a consistant, long range thumper of a load for my 375 ultra.

My 300 RUM shoots H1000 and I'm planning on shooting rl-33 when I can get sometime to play.
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Old 11-26-2013, 03:46 PM
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Re: 375 RUM and the 260 Accubond...

DoubleZranch
Might want to look at Hodgdon's Superformance. Used it in development loads for the Hornaday 300gr SpBt in the 375 Ruger. The two loads were 80gr of IMR 4350 and 83.3gr Superformance. The 4350 showed about 56 - 57kpsi (Pressure Trace II) and the Superformance was about 4kpsi less. These loads were from Hornaday's Manual but they are safe even with their Copper clad steel jacketed DGX/DGS Dangerous Game bullets. Steel jackets have a much higher pressure coefficient so the AccuBond would be safe with a comparable ratio of 4350/Superformance. Superformance works at about 60kpsi and it isn't for every load but where it works it is the best. Superfomance has a burn rate about the same as 4831 and RL19.

Ball park load is 92grs but I would start lower and work up to reasonable pressure signs. The 80gr 4350 - 300gr Spbt load in the 375 Ruger was heavily compressed but the 83.3gr Superformance load was about 100% density. You can pack a ton of Superformance in a case - very dense powder. As always a Federal #215 LRMag primer.

Just my two cents....
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