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300 Weatherby mag Handload

 
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  #1  
Old 03-14-2008, 07:53 PM
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300 Weatherby mag Handload

I have been handloading for me 30-378 with Retumbo powder. I would like to use this powder for developing a good load for my brothers 300 Weatherby Mag. We are loading 180gr Accubond, weatherby brass, Fed 215 primers. I was thinking of starting off with about 80gr and checking the speed with my Chronograph. Any ideas or experiance with retumbo and a 180gr Accubond in the 300 Wb mag.?
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Old 03-15-2008, 06:11 PM
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I found retumbo to work great in my very fussy 300 ultrlight. As a matter of fact I was just about to spring for a new re-barrel. I found that it loved 200 grain accubonds at 86 grains and 180 tsx's at 88. The 88 grain load is doing about 3250 and that's with hornady brass which doesn't have the same capacity as wby. Wby brass does about 3210 in my gun. Retumbo is slower than H1000 but just a tad bit. I would recomend that you start with H1000 data and work up an extra grain or two with the retumbo. Starting way down at 80 grains would be a big waste with a 180 and retumbo.....I'd say load up 3 loads at 85, 86, 87 ea and go to the range and see what they do. Good luck....I hope it shoots as well for you as it did for me. Also, I did play with temp's with the retumbo a bit. It shot the same velocity at 20 degrees as it did at 65 degrees. (Not huge extremes but that's pretty much what I would hunt in 95% of the time.)
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Old 03-15-2008, 07:10 PM
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poplarking,
I think you may find Retumbo to be a tad too slow for 180gr bullets,I'm getting awesome speed with either H1000 or RE25,both on or above 3200,depending on how hot you load 'em.In a 28" barrel!I don't load 'em real hot,I like my brass to last a while.(it's very expensive over here!)
Another thing you will find is that the Accubonds get higher velocity with lower pressures than other bullets,this is why I recommend H1000 or RE25.
H1000 start load 83gr-max load 88.5gr.
RE25 start load 83gr-max load 88.5gr.
I use Federal Gold Medal Match Magnum primers for all loads in this cartridge.
Good Luck!
MagnumManiac
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Old 03-16-2008, 02:09 PM
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Magnum...not trying to start an argument but I don't understand your post. The guy wants to try retumbo and is looking for someon who's used it. I post that it worked great accuracy wise and got me 3250 fps with a 180. You come on with apparently no experience trying it and tell the guy you think he'll find it's too slow a powder?
One last question...can you explain your comment about how accubonds get higher velocity at lower pressure than other bullets??

Last edited by kraky2; 03-16-2008 at 02:12 PM.
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  #5  
Old 03-18-2008, 11:06 PM
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[quote=kraky1;196087]Magnum...not trying to start an argument but I don't understand your post. The guy wants to try retumbo and is looking for someon who's used it. I post that it worked great accuracy wise and got me 3250 fps with a 180. You come on with apparently no experience trying it and tell the guy you think he'll find it's too slow a powder?
One last question...can you explain your comment about how accubonds get higher velocity at lower pressure than other bullets??[/quote
Kraky1,
To explain how Accubonds get higher velocity with less pressure would take a book!
Here's a simple explanation.
If you have used Accubonds or Ballistic Tips a lot,you would have noticed that for a long bullet,which they are longer than other bullets of the same weight,they have less shank that engraves the rifling,which means,as my tests over my chronograph have proved,they get higher velocities with less powder than other 'conventional' style bullets of the same weight.
Less powder means less pressure.

Now for your other comment,you stated,Retumbo worked GREAT,and got 3250.
I shoot a 300 Weatherby!
I have found Retumbo to be TOO SLOW for this catrridge with 180gr Accubonds for the above reasons.Which means that you can get very high velocities without the need for ULTRA SLOW powders.
You quoted using Barnes tsx 180gr bullets,which anybody that has reloaded for more than 5 minutes knows they produce HIGHER pressure than anyhting else,therefore needing a SLOWER powder to get published velocities.
Hope this answers your question.
MagnumManiac
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  #6  
Old 03-19-2008, 07:31 AM
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Actually..what I think you are trying to say is that accubonds make more pressure with less powder. Because that is what is actually happening. ANY time you have a longer bullet with more bearing area it makes more pressure....not less. Just like moly coating makes the bullet slipperier and people have to actually add powder to get the pressure and velocity back up again.
As far as a big difference between the accubond and the tsx.....maybe one grain...maybe not. I've played with lots of both and find them to be so close to one another that I would never say that one powder could work for one and not the other.

Last edited by kraky2; 03-19-2008 at 07:34 AM.
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Old 03-19-2008, 05:15 PM
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Quote:
Originally Posted by kraky1 View Post
Actually..what I think you are trying to say is that accubonds make more pressure with less powder. Because that is what is actually happening. ANY time you have a longer bullet with more bearing area it makes more pressure....not less. Just like moly coating makes the bullet slipperier and people have to actually add powder to get the pressure and velocity back up again.
As far as a big difference between the accubond and the tsx.....maybe one grain...maybe not. I've played with lots of both and find them to be so close to one another that I would never say that one powder could work for one and not the other.
I think you better read my post a little more closely,I stated that accubonds have less bearing surface than TSX bullets,and most others,which gives LESS pressure.The Accubonds do not give higher pressure with less powder,because how would I be able to load above listed max loads and still be in the SAFE level of pressure.The Accubonds and Ballistic Tips are what you would call 'powder efficient' bullets,because as I stated they get higher velocity with LESS powder.It is not the pressure of the cartridge that moves the projectile,it is the GASES produced,in this case the bullets move easier through the bore at lower PRESSURE.
Pressure has very little effect on velocity,a 10% reduction in pressure may only give a 2% reduction in velocity!FACT!
You have contradicted yourself with the bit about moly coating,it DECREASES pressure so you can use more powder to get higher than normal velocity.You cannot compare the two,because a 'normal' bullet isn't 'slippery' like moly is,but you can compare Barnes bullets to others,they ALWAYS produce higher pressure with LESS powder,as much as 5grs less powder for max loads!
I have done extensive testing on this subject,comparing bullets of different length,shape,hardness and construction,and they all vary in how much velocity they will get with a certain powder charge (the control charge).Accubonds and Ballistic Tips have ALWAYS given the highest velocities in these tests,regardless of calibre or weight.
MagnumManiac
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