458win mag and TrailBoss

[Dogmann]

Can anyone here recommend a load in the 458 wm with trail boss powder and a cast bullet !?

[runfiverun]

913-362-9455
they can tell you everything you wanna know about trail boss powder.
other than that start with 45-70 data.

[wellfedirishman]

Trailboss is great stuff. I use 13 grains in a 45-70 with a cast bullet with excellent results.

In my opinion it is one of the best cast bullet powders around.

[marlinman80]

I tried trail boss for the first time in 30-30 the other day. put 9.5 grains behing a lee 150 gc flat point. at 50 yards got a 8"group and thought well hell that ain't right so went back in the house and loaded ten more of the same load without a gas check and didn't resize them 2 5 shot strings and you could cover both groups with a worn out dime. It is a very low pressure powder and didn't disrupt that gas checked resized bullet enough to grab the rifling.I like IMR'S rule about trail boss too. Mark how deep you seat the bullet in the case then mark it and fill with powder to that level that is the maximum load for that case with a lead bullet. This load is kinda like shooting a 22 it just happens to be throwing a 160 grain boolit at the same speed.

[Dogmann]

Anyone else using trail boss in the 458wm?

[Dogmann]

Also. Do you guys reccomend the 405g bullet or something else?

[nekshot]

I can't help you on your questions but I use alot of trailboss and less is usually better than more. It seems to work best sub-sonic but I don't know it all for all calibers.
nekshot

[aspangler]

I tried trail boss for the first time in 30-30 the other day. put 9.5 grains behing a lee 150 gc flat point. at 50 yards got a 8"group and thought well hell that ain't right so went back in the house and loaded ten more of the same load without a gas check and didn't resize them 2 5 shot strings and you could cover both groups with a worn out dime. It is a very low pressure powder and didn't disrupt that gas checked resized bullet enough to grab the rifling.I like IMR'S rule about trail boss too. Mark how deep you seat the bullet in the case then mark it and fill with powder to that level that is the maximum load for that case with a lead bullet. This load is kinda like shooting a 22 it just happens to be throwing a 160 grain boolit at the same speed.

A+ to that. Trail boss does not like to be compressed. Take a max load per above, reduce by 30 percent. That is your start load. Work up from there for accuracy to the max load.