What kind of muzzle velocities are you getting with your big bore flintlocks.

[Tyockell18]

I don't own a chrony unfortunately.

I'm wondering if any of you guys out there with your .69's and .75's have bothered to chrony your round balls.

What kinda charges were you using. Is it possible to get those big .75 cal balls up to super sonic with safe pressures or no?

I hear you can reliably do it with the .69's.

Look forward to hearing your experiences.

 

[mooncoon]

I just checked Wikipedia; the speed of sound is 1122 ft per sec. While I suspect most of the large calibers are probably not loaded to over 13 or 1400 fps, I also suspect most are running 1100 - 1200 fps which means that most would be supersonic. I have chronographed black powder shotgun loads and 80 grains of 2F and 1 oz of shot came out at 1050 fps

cheers mooncoon

 

[Tyockell18]

Do you think that supersonic threshold has a negative impact accuracy wise on that big round ball? Thanks for the reply as well.

 

[Goldenlakepete]

In Sam Fadala's "Black Powder Loading Manual" he tests a large bore flintlock.

A .74 cal Brown Bess with a .690 ball and 80 grs of Fg produced 809 fps.

 

[Tyockell18]

In Sam Fadala's "Black Powder Loading Manual" he tests a large bore flintlock.

A .74 cal Brown Bess with a .690 ball and 80 grs of Fg produced 809 fps.

Thank's for the input, interesting. A little lower than I would have thought.

 

[Goldenlakepete]

Thank's for the input, interesting. A little lower than I would have thought.

That's a huge chunk of lead! 494 grs. The momentum of that ball would be huge.

 

[Tyockell18]

Welp, not sure the velocity was but this was a .735 patched round ball with 80gr's of Goex 2F.

I really need a chrony....

Wacked this piece of hardwood pretty good and split it.

 

[maple leaf]

Welp, not sure the velocity was but this was a .735 patched round ball with 80gr's of Goex 2F.

I really need a chrony....

Wacked this piece of hardwood pretty good and split it.

Nice flinter! What is it, and what is the overall length of that beast? It looks pretty compact.?

 

[Tyockell18]

Nice flinter! What is it, and what is the overall length of that beast? It looks pretty compact.?

Thanks, glad you like it, I really do to.

It's the Early British Sea Service musket, a plain jane cut down version of the Brown bess. I got it from Loyaist Arms in Nova Scotia, it works excellent, no complaints.

They did a very good job tuning and hardening the lock, frizzen ect. provided the flint is good, it goes bang every time.

When I get home I will measure the gun and let you know.

 

[Tyockell18]

Got home and measured it, 53.5 inches long overall. Barrel is 38 inches. Caliber mics to .761