Does anyone use 120-150 grains of triple 7 FFFG

[HoofsandWings]

I am looking to increase my muzzle velocity.

[Sabotloader]

I shoot 120 grains with 300 grain bullets for elk hunting, but there are very few guns rated for 120-150 of T7-3f.  Knight DISC's are rated for 150 grains of any BP or BP sub, but most often the harmonics created in barrel by that much powder end up stretching the heck out of your groups.

[RG]

Yikes, I shot through an elk side to side at 40 yards with 100 grains of 3f goex and a 220 round ball.

[carpsniperg2]

I shoot 120g of 777 fffg with a 290tmz.

[Sabotloader]

I shoot 120g of 777 fffg with a 290tmz.

Yep, see I think that is a great elk load for many different circumstances from 20 yards to 200+

[carpsniperg2]

Both my cva and tc turn to crap if I get more then about 130 grains of powder down the tube. They just don't groups as well. I have had guns that like 90 grains and some that like 150 grains. 120 seems to be the ticket in both my current guns.

Now that I can bow hunt during my late muzzy tag I don't know how much more powder I will be burning 

[Sabotloader]

Both my cva and tc turn to crap if I get more then about 130 grains of powder down the tube. They just don't groups as well. I have had guns that like 90 grains and some that like 150 grains. 120 seems to be the ticket in both my current guns.

Now that I can bow hunt during my late muzzy tag I don't know how much more powder I will be burning 

Well that is good since neither the CVA or TC's are rated for anything above 120... and CVA is reluctant to agree to 120 - they used lock you out at 100 grains of loose... With the Bergara barrels they have moved up to 120

[HoofsandWings]

I use a knight bighorn. The manual says 150 is max. I will try 120 and see how it goes.

[bobcat]

You need to remember, Triple 7 is "hotter" than standard black powder, so even if your muzzleloader is meant for up to say, 150 grains of powder, that would be equivalent to about 125 grains of Triple 7.

This is from the Hodgdon website:

All charges of Triple Seven or Pyrodex should be measured by VOLUME not weight. A simple, adjustable blackpowder measure is the correct tool for this job. All loads listed in this brochure are measured by VOLUME.
Triple Seven is a high energy product designed to provide the muzzleloading hunter with higher velocities when used in the same VOLUME as blackpowder. To duplicate a blackpowder load velocity using Triple Seven, you must decrease the powder charge by 15%. *See WARNING below.
Pyrodex is lighter in weight than blackpowder and weighs only about 70% as much as blackpowder. However, because Pyrodex yields more energy per pound than does blackpowder, the same volume of Pyrodex gives similar performance to blackpowder. Pyrodex loads given in this manual for muzzleloading guns are measured by volume, not weight.

[HoofsandWings]

Thanks Bobcat.

[PolarBear]

A buddy of mine did a chronograph study with his muzzy with close to 100 different load combos.  He came up with the conclusion that anything over 110 grains of powder is a waste and it does not significantly increase speed, accuracy or velocity.   

[RG]

There was a writer years ago named Sam Fadala who wrote a lot of muzzleloader articles and a few books.  Most of his work was with black powder and pyrodex since the others weren't invented yet.  I recall a test he did where he shot progressively larger loads across snow.  He found that, above somewhere around 110 to 120 grains or so, the powder wasn't burning completely but was just getting shot out onto the snow unburned.  The length of the barrel dictated how much powder was burned before the bullet left the barrel.

[PolarBear]

That's kinda what my buddy did but he put some old white bed sheets in front of his muzzle.

[Sabotloader]

I use a knight bighorn. The manual says 150 is max. I will try 120 and see how it goes.

Your Big Horn is rated for 150 grains of loose or Pellets.  In their manual they print the rating is for any BP or BP Substitute powder.  The next portion of the statement you have to match with is the weight of the bullet..



With that... I would say that in a plunger gun like a Big Horn I would and do limit my loads to 110 grains of T7-3f with up to a 300 grain bullet.

[Sabotloader]

A buddy of mine did a chronograph study with his muzzy with close to 100 different load combos.  He came up with the conclusion that anything over 110 grains of powder is a waste and it does not significantly increase speed, accuracy or velocity.   

I know that is the common belief and it was pretty much true with true black powder and the Pyro's, but T7 and BH do not follow along those lines...

Here is an incomplete chrono table for a 50 shooting T7 and BH - you can see the velocities of each load.



And with this one for a 45, which is complete