3/4 Oz High Velocity Data ?

[Johnch]

I am messing around and have made a shotgun slug

I used a CSD wad and spacers
CSD wads are a thick steel shot wad that is not slit when you buy them
Added a pressed in cast bullet that is just over the ID of the wad

So I made a non discarding slug that I plan on shooting from a rifled 870 shotgun barrel

Total weight other than the wad is 3/4 oz

Anyone have any load data for a high velocity 3/4 oz load ?
I know I will have to adjust for the CSD wad
But a friend has a 870 12 gau barrel with a pressure gauge attached to it
So I can make sure the loads are safe once I have some place to start

I would like to be in the 1400 to 1600 FPS if possible

Thanks
John

[barnetmill]

I am messing around and have made a shotgun slug

I used a CSD wad and spacers
CSD wads are a thick steel shot wad that is not slit when you buy them
Added a pressed in cast bullet that is just over the ID of the wad

So I made a non discarding slug that I plan on shooting from a rifled 870 shotgun barrel

Total weight other than the wad is 3/4 oz

Anyone have any load data for a high velocity 3/4 oz load ?
I know I will have to adjust for the CSD wad
But a friend has a 870 12 gau barrel with a pressure gauge attached to it
So I can make sure the loads are safe once I have some place to start

I would like to be in the 1400 to 1600 FPS if possible

Thanks
John

I have thought of doing something like, but also to drill like 1/8" diameter and insert an appropriate screw with a nut and washer at the powder in.
I would start with a medium powder load for a 1 oz foster slug.

[Milky Duck]

take a load for similar weight of shot...... of a heavier load of shot just to be on safe side... ASTEEL will give you heaps of velocity but also heaps of noise....

[longbow]

A 0.662" RB presses into a CSD wad nicely when they are cut off and I have been told they do work well as a non-discarding sabot but so far I haven't tried it.

As for 12 ga. 3/4 oz. loads, BPI has listings. Here are some from Load of the Week:

https://www.ballisticproducts.com/load15_10_30.htm

Longbow

[Johnch]

Thanks

[Milky Duck]

what powder do you have on hand...I can look in lyman manual and go from there.... ASTEEL load data is easy to find too.
21.3 grns of tightwad in a 2 3/3" case is listed for 7/8th oz load at 1400fps wit ha rem tgt12 wad... posible starting point.
international powder....22 grns for similar
that from 2012 manual... start low n work up etc etc etc etc...