Slugs

[greenwayjames]

We did 30 years ago with Gerald Cardew, I designed them and he made them so not hypothetical at all.

What air rifles were used to try them in and at what power levels?

[ballisticboy]

What air rifles were used to try them in and at what power levels?

The energy was around 12FPE on all tests. The pellet was not designed for higher speeds. Gerald carried out all the testing so I am not sure exactly what was used in .22 or .177.

[greenwayjames]

The energy was around 12FPE on all tests. The pellet was not designed for higher speeds. Gerald carried out all the testing so I am not sure exactly what was used in .22 or .177.

What make and model air rifles were used to confirm your theories and wind tunnel work with models and prototypes for the design of a slug.
Confirmation that your slug made waisted pellets look like "the ammunition equivalent of the Model T Ford" in most available air rifles must have been of interest to you? Thats what takes it from being hypothetical to being a winner in the real world. You seem a bit p* ssed that pellet manufacturers didnt want to know at the time. A practical demonstration of its superiority over good commercial waisted pellets in any old barrel with any old twist rate would have opened their eyes.

[ballisticboy]

You seem a bit p* ssed that pellet manufacturers didnt want to know at the time.

Actually I wasn't at all p* ssed that no manufacturer wanted to continue as I was more in it for the science. To me it was just an exercise in applying proven ballistic and aerodynamic design which I worked with every day. There was nothing hypothetical or novel in what was done, it was all proven many years ago and used in the evolution of ammunition design since the 1920s. This is why bullets, shells, cannon and tank ammunition all look and are so different to how they were 100 years ago. We just applied those same principles to something suitable for air guns.
Our first attempts were not exactly successful.

[greenwayjames]

Glad you took my post in the manner it was intended. As a shooter I am more interested in the air rifles they were tried in and the results that were obtained using them. Were they everyday airifles as sold in gunshops at the time?

[krisko]

https://www.airgunnation.com/topic/2...-lots-of-pics/

I don’t think slugs group even at high power just look at this report, JSBs one hole group at that distance.

There is no more pin point accuracy we would prefer.

The Current state of affairs and that’s with a special slug barrel or what they claim it is. idon’t know what the authors aim is but for me all that is unacceptable precision. Sorry

Pellets excellent at short airgun distances, slugs are apparently poor both short and long range. it is your choice lol

What is this craze about irresponsibly pushing the distance? Does not make any sense to me. If you can’t hit a bottle cap repeatedly, that’s where you stop FFS!

[arnie2b]

https://www.airgunnation.com/topic/2...-lots-of-pics/

I don’t think slugs group even at high power just look at this report, JSBs one hole group at that distance.

There is no more pin point accuracy we would prefer.

The Current state of affairs and that’s with a special slug barrel or what they claim it is. idon’t know what the authors aim is but for me all that is unacceptable precision. Sorry

Pellets excellent at short airgun distances, slugs are apparently poor both short and long range. it is your choice lol

What is this craze about irresponsibly pushing the distance? Does not make any sense to me. If you can’t hit a bottle cap repeatedly, that’s where you stop FFS!

The guy says

I ended up polishing my slug liner. I used 320 grit, 400 grit, 1000 grit and finally with 2000 grit. I did the whole barrel but focused a lot of my effort on the choke

Are these liners chocked?
If these slug liners are chocked you have to size the slugs to the choke if that can be done and they're not too small already.
1/21 twist rate makes it a slow twist, slugs generally like to have spin in the smaller calibers.

.25 is a pistol calibre never known for it's accuracy in slugs same as 9mm.
.257 on the other hand can be accurate I posted a link above of what can be achieved but it still isn't quite pin point accuracy. I mentioned above too that they guys with fx slug liners in .25 can't hit the proverbial barn door at a 100 yards.

Makes me wonder if the art barrels from daystate are shooting the jumbo heavy's or another heavy pellet...

[ballisticboy]

Glad you took my post in the manner it was intended. As a shooter I am more interested in the air rifles they were tried in and the results that were obtained using them. Were they everyday airifles as sold in gunshops at the time?

In early work Gerald used his projector but I really don't know what else was used later on, all the data and records went years ago. I used a HW35 and a Vulcan I had at the time, mainly the HW, and I have fired a few from a TX200 but not many as there are very few in existence now and many of them are slightly different, all in .22. The ones fired from the TX were coming out around 11.4FPE with a velocity loss over 30 yards of just 40ft/sec.

[MartynB]

In early work Gerald used his projector but I really don't know what else was used later on, all the data and records went years ago. I used a HW35 and a Vulcan I had at the time, mainly the HW, and I have fired a few from a TX200 but not many as there are very few in existence now and many of them are slightly different, all in .22. The ones fired from the TX were coming out around 11.4FPE with a velocity loss over 30 yards of just 40ft/sec.

Interesting reading, what was the accuracy like in the TX ?