Thread: Slugs with Unique

I would go with a slower powder than 700x because a tight slug could cause more of a pressure spike than a shot load.
700x melts the crimps on cases so it must be so fast in practice that it burns in the case. Perhaps something with the burn rate of PB. A slower powder likely will give better accuracy if the same effects apply as with rifles

Originally Posted by Moa Hunter

I would go with a slower powder than 700x because a tight slug could cause more of a pressure spike than a shot load.
700x melts the crimps on cases so it must be so fast in practice that it burns in the case. Perhaps something with the burn rate of PB. A slower powder likely will give better accuracy if the same effects apply as with rifles

The following from Ballisticproducts.com.

"Unique's burn rate is to fast for Lee slugs, unless you want reduced loads. There is no data using plastic wads & Lee Key drive slug & Unique powder, that i know of? I worked up some Unique loads with 1 oz Lee
Key Drive slugs. Acccuracy was poor. Pressure needs to be high enough to expand the slug to the bore."

https://www.ballisticproducts.com/load14_04_25.htm

Originally Posted by Tedz50

The following from Ballisticproducts.com.

"Unique's burn rate is to fast for Lee slugs, unless you want reduced loads. There is no data using plastic wads & Lee Key drive slug & Unique powder, that i know of? I worked up some Unique loads with 1 oz Lee
Key Drive slugs. Acccuracy was poor. Pressure needs to be high enough to expand the slug to the bore."

https://www.ballisticproducts.com/load14_04_25.htm

Ok. I guess I'll be be using AP70N

If it's in a plastic wad ,plus having a bridge across the base of the slug how's it ever going to expand to bore size?

QUOTE=Peteforskeet;If it's in a plastic wad ,plus having a bridge across the base of the slug how's it ever going to expand to bore size?[/QUOTE]

I have a Gibb 62 calibre rifle and use 20 gauge slugs in a plastic wad. This slug has a solid base but even inside a wad it expands from a loose sliding fit to deeply engrave the rifling on the wad.This is probably due to the fast ignition of black powder which in spite of the wad shortens and expands the projectile.This is one reason I believe a fast powder like 700X is used. If you pick up fired wads they show scouring from the trip down the barrel. The keyes built into the lee slug base help it expand with out collapsing.Just my opinion for what its worth.