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  #21  
Old 02-15-2017, 04:07 PM
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Originally Posted by StretchNM View Post
I’m working on some loads for the Sierra 120gr spitzer Pro Hunter using IMR4064 powder. Rifle is new Tikka in 260 Remington.

USING IMR4064

According to Sierra the maximum load for this bullet is 42.0 grains yielding about 3000 fps.

The maximum load from Lee is 37.0 grains. Now this is a 5.0 grain difference. Hornady and Lyman do not list an IMR4064 load for a 120gr bullet. Hornady lists a maximum load for a 100gr bullet as 40.9 grains, a full grain less than Sierra’s load with a bullet weighing 20 grains less! Similarly, Lyman lists a max load for a 100gr bullet at 41.5 grains, again .5 grains less than Sierra’s for a bullet weighing 20 grains less.

Back to Lee versus Sierra: A full 5 grains difference in maximum load for the same weight jacketed bullet. This is substantial. Why?

A comparative analysis of other powders maximum loadings for the 120 grain jacketed bullet:
SIERRA: Varget 40.4 gr; RL15 40.0 gr; RL19 44.5 gr; IMR4350 42.8 gr
LYMAN: Varget 40.5 gr; RL15 40.5 gr; RL19 47.7 gr; IMR4350 45.7 gr
LEE: Varget 39.0 gr; RL15 and RL19 none listed; IMR4350 43.0 gr

This short analysis shows that, of the comparable powders, the loads are relatively close, the greatest spread being a 3 grain difference between Sierra and Lyman using IMR4350 and RL19. But none of them near the full 5 grain difference for the hot Sierra load using IMR4064.

Over the last week or so, I have already loaded and fired 40 rounds loaded with IMR4064 ranging from a low of 33.5 grains and a high of 41.5 grains. There have been no problems or signs of pressure that I can see – no excessive recoil, no hard bolt lift, and fired primers and bottoms of cases look fine. Groups are good and better at heavier loads. Right now, I have 20 cartridges loaded between 40.8 grains and 42.0 grains using these Sierra bullets. It is just today that I caught this discrepancy between the manuals.

Does anyone have any insight here?
It probably has something to do with the barrels they used to determine the load at the factory. I suggest that you write to Sierra and ask them. They are the professionals, and if anyone knows it would be the guys who wrote the book
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  #22  
Old 02-15-2017, 04:20 PM
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They responded a couple of days ago, saying the 42.0gr max load was correct, along with some other general advice.
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  #23  
Old 02-15-2017, 06:14 PM
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Sierra develops their loads in test guns on-site that do not have strain gages or other pressure measuring devices. Then, when they think they have a max load, they send it off to be pressure tested. In the words of my guide on the tour, "Sometimes we have to reduce the load a little, sometimes it needs to be increased a little." But, in the end, I was told that max loads are in fact pressure tested. I think he said they were sent to Hodgdon, but not 100% certain.

So, it was a max load for their components. It might not be with other lots of components.
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  #24  
Old 02-16-2017, 04:57 AM
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Didn't realize that 4064 had been through that many changes as far as production goes, good to know.
The 260 is still very popular for highpower silhouette, 107, 123 and 142 matchkings being the most popular, these guys priority is accuracy and speed with the long ranges involved, most of them load with Varget.
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  #25  
Old 02-16-2017, 05:15 AM
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I try not to "push the envelope" when it comes to following the max recipes in reloading manuals. The data here is derived using their test barrels and not my rifle. Had the bullet/powder company run their tests using my rifle, the recipe may well be different from what they published. My goal is accuracy more than velocity. To own his each, YMMV
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  #26  
Old 02-16-2017, 03:38 PM
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I have been using imr4064 from the start in 1997, when i first started loading the 260 rem. Have always used 120 grain bullet. 41.5 grains is where i have stopped. Good accuracy and case life, still have my original cases. Case head expansion starts at 43 grains, so backed to 41.5 with sierra 120 grain bullet. Used 7mm08 cases before remington got their brass to market..
Familiar with data in ackley book, but ackley did not develop data himself. Ken waters published data and called it 263 express. 260 is my go to whitetail gun.
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  #27  
Old 02-16-2017, 04:04 PM
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Ttexastom, will you tell me your bullet make, primer, and distance to rifling lands?
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  #28  
Old 02-16-2017, 04:47 PM
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Sure, 120 sierra,120 grain ballistic tip, winchester large rifle primer, bullet seated 2.795, .005 off rifling in remington model 7. This caliber is a keeper, very close in trajectory to 270 winchester.
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  #29  
Old 02-16-2017, 05:05 PM
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That is very close to what I'm working on now in this new rifle. I'm staying .035 off the rifling for now until I can get this powder charge down. Using Wolf primers, but that may change later.
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