.22 hornet

[Ka-Boom!]

Until you try it over a chrono as I have you can’t make a comment try it then report back

I don't need a chrono to know that a Hornet isn't going to get a 20 grain projectile to 4800fps with black powder.
You do know that's more than 1000fps quicker than a 17 Hornet can manage using modern powders?

[Parabuteo]

Blimey.

As the bear suggests, if your empties are giving you a stiff bolt lift, on something as small as a Hornet, well, its a classic sign of over pressure (quite bad overpressure as it goes, usual early signs are flattened or cratered primers and the case being burnished by the opening bolt rubbing on the case head).

Your cases are not able to spring back and eject which means the poor little things are not well.

[themariners]

the Hmr head doesent weight 18 grains quite a bit more

[Randy Bohannon]

Most feral people that don’t own any land call people
Idiots when they have never met them so it’s very relevant
You have also never tried the round or the that bullet weight or even
Have access to a chrono unless someone lends you one on the lent land you shoot on

Any chance of explaining the physics of getting 155% more velocity from a bullet of more than 57% of the mass whilst using a powder charge containing ~67% energy than a smokeless loaded .22 hornet with a 35 grain bullet?

[223AI]

Any chance of explaining the physics of getting 155% more velocity from a bullet of more than 57% of the mass whilst using a powder charge containing ~67% energy than a smokeless loaded .22 hornet with a 35 grain bullet?

No physics, just magic and fairy dust only those that own land can access or understand

I always find muzzle energy a useful comparison, so 20 gr at 4800 fps, 1025 ft lb, with BLACK POWDER, now hornet can be loaded to .222 levels but with heavier bullets and loaded way beyond published data (not recommended). I don't believe a lesser amount of lower energy propellant can push a light projectile north of 1000 ft-lb (without magic of course)

[223AI]

the Hmr head doesent weight 18 grains quite a bit more

Um, no one mentioned HMR, which are commonly 17 or 20 gr loads and gets nowhere near your quoted figures (2250ish with a 20gr) using modern powder, ok probably only only 5 gr of powder but smaller cartridge so higher pressure, tripling the powder won't more than double the velocity.

If you're referring to Guesty's post then he is talking .17 hornet, same cartridge as yours necked down and renowned as a bit of a speed demon for capacity, yet it falls 1000 fps short of your reported figure without the wad slowing things down and using modern powder.

[angrybear]

I'd hazard a guess that the chrono is reading bit's of wadding blown out ahead of the ball

I can manage 3450fps with a nice aerodynamic 30gn from my "K" but that's a compressed load 13.7gn of lil-gun, & under 750fpe