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Trail Boss In 338 Lapua Mag

 
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  #1  
Old 06-18-2012, 12:46 AM
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Trail Boss In 338 Lapua Mag

I am thinking about trying some trail boss in a 338 Lapua to test low end expansion with the 280 grain Barnes Lrx. Barnes says they will expand down to 1600 fps in water so i figure i will need about 1700 fps to get 1600 fps at 100 yards. Do you think i can get this velocity or even anything above 1600 fps with this powder in a 26 inch barrel? Has anyone tried trail boss in a 338 Lapua? Or will i be one of the first?
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Old 06-18-2012, 12:30 PM
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Re: Trail Boss In 338 Lapua Mag

You can probably get the velocity you want with Trail Boss but you won't be able to get it consistently. There is too much empty space left in the case after you find the correct ammount for the velocity. I use Trail Boss in my sub-sonic 308 rounds and it's very hard to get consistant 1050 fps due to the powder shifting to different positions inside the case. If I want any kind of accuracy at all, I have to load the round in the chamber, put the gun in a vertical position, bump the recoil pad twice on the shooting table, carefully lower the rifle to the shooting rest and fire it. I haven't tried using fillers in the case because I'm shooting it through a suppressor and don't want the inside coated with synthetic fiber or organic filler.
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Old 06-18-2012, 01:19 PM
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Re: Trail Boss In 338 Lapua Mag

What type of fillers could I use to increase the load density? I have heard about using them before but didn't know what materiall to use.
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I'm 15
"Firearms are second only to the Constitution in importance; they are the peoples' liberty's teeth."
~George Washington

"The only advantage a light rifle has is weight, all other advantages go to the heavy rifle."
~ JE CUSTOM

"Dope that scope and tickle that giggle switch"

~Doublezranch

Biggest fail of 2014 so far... http://www.longrangehunting.com/foru...ea-ftf-128972/
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  #4  
Old 06-18-2012, 01:26 PM
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Re: Trail Boss In 338 Lapua Mag

I've heard of people using everything from cream-of-wheat to corn meal to polyester fiberfill to you name it. Some company used to make a fiber filler just for squib loads but it's been too long for me to remember the company or name. Try Google.
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Old 06-18-2012, 01:35 PM
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Re: Trail Boss In 338 Lapua Mag

Does using a filler affect pressures at all? Do you just pour your powder then add cornmeal until it is at where the base of the bullet would be when seated to the correct depth?
__________________

I'm 15
"Firearms are second only to the Constitution in importance; they are the peoples' liberty's teeth."
~George Washington

"The only advantage a light rifle has is weight, all other advantages go to the heavy rifle."
~ JE CUSTOM

"Dope that scope and tickle that giggle switch"

~Doublezranch

Biggest fail of 2014 so far... http://www.longrangehunting.com/foru...ea-ftf-128972/

Last edited by barnesuser28; 06-18-2012 at 02:01 PM. Reason: add on
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  #6  
Old 06-19-2012, 09:01 PM
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Re: Trail Boss In 338 Lapua Mag

well i picked up 2, 9oz jugs of trail boss yesterday. i am going to try it with the hornady 285 grain bthp bullets first just to get me close to the velocity that i want then i will switch to the Barnes to get my final powder charge. so do i need to put something like a piece of paper between the trail boss and the filler so they dont mix? or do i just pour the powder and put in the filler. (i am going to use cornmeal)
__________________

I'm 15
"Firearms are second only to the Constitution in importance; they are the peoples' liberty's teeth."
~George Washington

"The only advantage a light rifle has is weight, all other advantages go to the heavy rifle."
~ JE CUSTOM

"Dope that scope and tickle that giggle switch"

~Doublezranch

Biggest fail of 2014 so far... http://www.longrangehunting.com/foru...ea-ftf-128972/
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  #7  
Old 06-20-2012, 10:01 AM
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Re: Trail Boss In 338 Lapua Mag

Yes the filler will effect your pressure. The easiest way I can describe it is, the filler becomes a projectile as well (doesn't have anywhere to go except down the tube). You are adding to the mass of your bullet, by a LOT. I use the corn meal to fire form 6.5-06AI brass & it works really well, but this is done w/o a bullet.

Be extremely careful with this experiment, there is a gent here locally who decided to use corn meal to increase the consistency of his target rifle's full tilt loads. He now only has one eye & no thumb after his rifle grenaded on him.

Be very careful, I just can't advise doing that....
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