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Strange load development results

 
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  #8  
Old 04-01-2006, 09:35 PM
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Join Date: May 2004
Location: MD.
Posts: 225
Re: Strange load development results

Krazy
As Wapiti13 said you maxed out at which point you peak and loose FPS. I don't know anything about the Barnes bullets but for a 165 pill in a 300 Win you will be hard pressed to find a powder that will push em faster than R-22.
In my Sendero 26" R-22 would push a 165 NBT between 3320 and 3420 depending on the lot. 77.5- 79.5 At 79.5 I was still gaining fps but started to show signs of pressure. I have since sold the rifle but, I can say It was a deadly combo. With the 165 NBT R22 was top fps with the 180 R25 shined. I dont know if it could be the bullet but I would be curious to see what happens if you used a 165 NBT.
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  #9  
Old 04-01-2006, 10:48 PM
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Join Date: Dec 2004
Posts: 5
Re: Strange load development results

Thanks guys,

I think I understand what you are saying but am having a hard time trying to reason why I would try a slower powder as opposed to a faster powder in this situation. I have some H1000 (which I read burns slower than RL22) so I guess I could load some up and see what happens. Wapiti you mention 4831, which is actually burns faster than RL22, so maybe I'll try that too. If I can't crack 3200 with a 165 I think I will just move up to a 180.

By the way, I loaded some more tsx's and some NBT's today and confirmed that it is not just the bullet. Both the NBT's and the TSX's increased velocity and grouped quite well right up to 78 grains of RL22 at which point they both started to plateau velocity and the groups opened up a bit. At just under 78 grains both bullets maxed out at about 3125 fps with excellent groups (the tsx's actually out performed the BT's with a .417 group to the BT's .537 @ 100M). So I guess that's the best I can expect from RL22 and my 300WM.

Thanks again for the help. If anything else that I could try comes to mind please let me know........

Hey just one more thing. I am using fed215MG primers for the first time ever - do you think this could be contributing to what is happening?
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  #10  
Old 04-02-2006, 08:31 AM
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Join Date: May 2004
Location: MD.
Posts: 225
Re: Strange load development results

Is this a factory rifle or custom? Some barrel / chamber cobmos just run slower than others. Don't beat yourself up. Accuracy kills better than speed.
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  #11  
Old 04-02-2006, 05:48 PM
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Join Date: Mar 2004
Location: Spokane, WA
Posts: 521
Re: Strange load development results

Krazy, You may be right in needing a faster powder, but I don't think so. Since it appears that you ran out of "burn rate" before case capacity, that indicates that the powder and other factors are too fast. You might just have a slow barrel/rifle combo. Not much you can do but experiment with other components and see what happens. Try to borrow another rifle from someone and chrono your load for comparison.
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  #12  
Old 04-18-2006, 09:06 PM
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Join Date: Dec 2004
Posts: 5
Re: Strange load development results

Well here is an update. I don't really understand why it works like this but it seems that seating the bullet deeper in the case makes the powder burn more efficiently. Here is what happened:

I tried faster powders (IMR 4350 & H4831) and just broke 3100 FPS at max charge with slight pressure signs. I also tried a slower powder (H1000) and maxed out without pressure at just under 3100 FPS. So back to RL22 as at least I got 3125 with it. I started playing with seating depths and found that the deeper I seated the bullet in the case the more effect each grain of powder had on velocity. For example:

.03 off the lands with a 165 TSX

77 grains of RL22 got me 3100 FPS
78 grains got me 3096 FPS
79 grains got me 3056 FPS

Seems the powder stopped 'working' at 77 grains. In each case there were no pressure signs.


I moved to .05 off the lands and found that:

77 grains of RL22 got me 3057 FPS
78 grains got me 3125 FPS
78.5 grains got me 3161 FPS
79 grains got me 3195 FPS
79.5 grains got me 3187

Seems that at this bulet seating the powder stopped 'working' at 79 grains. In each case there were no pressure signs.

I am going to try seating at .07 off the lands next to see if it will allow the powder to use the full 80 grains that my book says is max.

The consequence of gaining velocity using this method, however, seems to be accuracy. Not much so far though as the 78.5 shot .7 and the 79 shot 1.18. At .03 off the lands 77 shot at .7 while 78 and 79 shot .6 even though velocity dropped and ES increased.

So that's my story - is this typical or is my rifle a freak?

Thanks for all the help.........

The OAL for this bullet in this rifle is 3.567. I guess I should have started at 3.34 like my manual said and I would not have experiened these issues - i just thought I would get better performance closer to the lands so that is where I started.
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