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 .. Why is there so much..............

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hawgslayer
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PostSubject: .. Why is there so much..............   June 20th 2014, 11:48 am

A while back Pete, informed me that the load I was going to use was a little slow. I checked the site, GOEX.com and Pete was correct.
From that point I started checking more closely and found that there are " BIG " differences between the Goex site  and the new Lyman 2nd edition black powder hand book and loading manual. EXAMPLE.......

My .58 cal w/32" barrel with 70 grs 2F is 1244 fps according to the Lyman book.
Same everything, according to Goex site it only gets 1050

My .50 cal PA HUNTER W/32'' barrel with 70 grs 2F is 1436 per the Lyman book.
It's 1550 according to the Goex site.

90 grs with my .50 is 1629fps per Lyman.
90 grs is 1870 fps according to GOEX.


I could see a little difference but this is none sense. If you go check you'll find some differences from 100 to 200 fps differences

Ray............  :Bat

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PostSubject: Re: .. Why is there so much..............   June 20th 2014, 11:56 am

I think a lot depend on the atmospheric conditions , height above sea level, loading technique and temperature when velocities are measured. I could never copy the Lyman manuals velocities as mine are always on the low side.
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PostSubject: Re: .. Why is there so much..............   June 20th 2014, 12:27 pm

I never really put much stock into any data I find. Its always best to run the load yourself over a chrono and see what you are getting. When I set up my chrony i'll do some 70gr 2f goex loads and report back on what I get.
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PostSubject: Re: .. Why is there so much..............   June 20th 2014, 12:51 pm

Every gun has variables that make it unique. Muzzleloaders don't have standards on barrel size and a .50 cal. in one gun may be 2-5 thousandths different from another .50 cal. Black powders are different from one brand to another and a 32" barrel may be 31.6" in one and 32.4" in another. Percussion caps vary too in their performance.

As Jon said, chrono your loads in your gun and that's the only way to find out.

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PostSubject: Re: .. Why is there so much..............   June 20th 2014, 1:49 pm

Jonathan,

I know you said you would help me out here but if possible can you chrony a few with 70 grs and 80 grs with a .015 mink oil patch with a .570 RB. If you felt like doing 90 grs I would really appreciate it.  :rtup 
At least I would have and idea where I'm at without buying a chrony.
Thanks everyone for the replies and your opinions..........

Good hunting all.

Ray............... t up

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PostSubject: Re: .. Why is there so much..............   June 20th 2014, 2:04 pm

not a problem! I still think the .015 is to thin  2c 
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PostSubject: Re: .. Why is there so much..............   June 20th 2014, 6:14 pm

Compression of the powder makes a difference in velocity.  Inconsistent loading pressure often leads to vertical stringing:

http://www.ctmuzzleloaders.com/ctml_experiments/bpcompress/bpcompress.html
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PostSubject: Re: .. Why is there so much..............   June 20th 2014, 7:01 pm

If I compress the load drastically in my flintlock, it has more delayed ignitions. The same procedure results in consistent results in my percussion guns.

I'm guessing it has something to do with having more oxygen around the looser loads that results in a faster ignition in the flintlock. The percussion cap provides a hotter fire directly into the load to counter the flintlock spark ---> prime load ---> main load ignition.

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PostSubject: Re: .. Why is there so much..............   June 20th 2014, 11:29 pm

The guys doing long range shooting will put a wad over the powder with about 1 to 2lbs of force and then just seat the bullet till it touches the wad.
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PostSubject: Re: .. Why is there so much..............   June 21st 2014, 6:00 am

Jonathan,

Next time out at the range I'll try some .018 patches with a generous amount of mink oil t up  

Ray.............  :rtup

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