Getting accuracy out of conicals

[brewer12345]

Its about 200 fps slower than pyrodex. You'd probably get good accuracy if you would drop it down to 80gr.

That is actually where I started. Nothing from 70 to 100 grains of pyrodex shot better than 4 or 5 inches at 50 yards. I am actually happy with the results I got with black mz. It ignites easily, works well with my rifle, and unlike real black powder I can actually buy it locally (for $10 a pound to boot). I may order a pound of goex when I put in my next hazmat order, but if this load packs enough wallop I have no reason to do anything else. It also does well with PRB from 50 to 70 grains (haven't gone higher).

[megasupermagnum]

Same as brewer12345, everything 80 grains and lower shot horrible. As in, not even on paper. At 90 grains things got significantly better, 100 grains better, and 110 better yet.

[megasupermagnum]

I did make an error by overstating how much faster 3F is than 2F for 120 grains of Goex.

It's only about 6% faster with that 120 grain load and not 9.4%.

2F is 94.38 % as fast as 3F [with the velocity of 3F being 100%].

And the velocity of 3F is 105.95% above that of 2F [with the velocity of 2F being 100%]

That percentage represents about a 7.2 grain powder difference out of a 120 grain Goex load.
While using a flat 10% would be a difference of 12 grains of powder.

"If you want to know what percent A is of B, you simply divide A by B, then take that number and move the decimal place two spaces to the right.
That's your percentage!
To use the calculator, enter two numbers to calculate the percentage the first is of the second by clicking Calculate Percentage."--->>> http://www.csgnetwork.com/csgpercent.html


The percentages could change for other loads depending on their charted velocities.
.

I think you are overthinking this. A max load of FFg, as in deemed by Thompson Center to be the maximum safe pressure for my rifle, is 120 grains. That first chart you posted, the red line being FFg in 54 caliber is about 1675 fps at 120 grains. The yellow line, being FFFg, is hard to tell exactly as it is covered, but looks like 100 grains is pretty close to the same 1675 fps. We know that is an unsafe load in my rifle, as it is producing more pressure than the safe maximum load of FFg powder. A faster powder will always produce more pressure at the same velocity of a slower powder, all else equal. What is a safe maximum of FFFg in my rifle? I don't know for sure, but I do know it's more than a 10% decrease in powder.

[FrontierMuzzleloading]

if you can blow up a TC barrel using a little more than 120gr 2fg, i wouldnt be shooting a tc barrel. It will handle a LOT more than that.

[megasupermagnum]

if you can blow up a TC barrel using a little more than 120gr 2fg, i wouldnt be shooting a tc barrel. It will handle a LOT more than that.

I wont disagree with you there. I'm thinking the first thing you might run into as far as safety is cap fragments flying back at you. I really doubt you could honestly blow up a TC barrel with FFg blackpowder without some sort of obstruction.

[arcticap]

The percentages show approximately how much slower Goex 2F is vs. Goex 3F in a .54 test barrel when loaded with a patched round ball.
The greatest % differences were with 50, 60 and 70 grains of powder.

40 grains 2F – 1130 / 3F – 1170 - 96.5% - 3.5% slower
50 grains 2F - 1210 / 3F - 1300 - 93.0% - 7% slower
60 grains 2F - 1300 / 3F - 1430 - 90.9% - 9.1% slower
70 grains 2F - 1410 / 3F - 1510 - 93.3% - 6.7% slower
80 grains 2F - 1520 / 3F – 1590 - 95.5% - 4.5% slower
90 grains 2F - 1550 / 3F - 1630 - 95.0% - 5% slower
100 grains 2F - 1590 / 3F - 1685 - 94.3% - 5.7% slower
110 grains 2F - 1630 / 3F - 1720 - 94.7% - 5.3% slower
120 grains 2F - 1680 / 3F - 1780 - 94.3% - 5.7% slower

[megasupermagnum]

The percentages show approximately how much slower Goex 2F is vs. Goex 3F in a .54 test barrel when loaded with a patched round ball.
The greatest % differences were with 50, 60 and 70 grains of powder.

40 grains 2F – 1130 / 3F – 1170 - 96.5% - 3.5% slower
50 grains 2F - 1210 / 3F - 1300 - 93.0% - 7% slower
60 grains 2F - 1300 / 3F - 1430 - 90.9% - 9.1% slower
70 grains 2F - 1410 / 3F - 1510 - 93.3% - 6.7% slower
80 grains 2F - 1520 / 3F – 1590 - 95.5% - 4.5% slower
90 grains 2F - 1550 / 3F - 1630 - 95.0% - 5% slower
100 grains 2F - 1590 / 3F - 1685 - 94.3% - 5.7% slower
110 grains 2F - 1630 / 3F - 1720 - 94.7% - 5.3% slower
120 grains 2F - 1680 / 3F - 1780 - 94.3% - 5.7% slower

And your point is...?

120 grains FFg, safe maximum load listed by TC. 1680 FPS.
100 grains FFFG, 1685 fps. Certainly more pressure, but equal velocity.

That's a drop of 16.67%, and still a higher pressure.