I'm hoping to tap into the Brain Trust here at Cast Boolits for an issue I'm having.
I have a .30 calber mould that Buckshot applied his artwork in hollow pointing to.
He did a beautiful job, and I also have a copy of the article "Hollow Points in the .30-30".
I loade up using the recommended 24.5 grains of IMR 3031 powder and steped out back to my 100 yard range.
The measured velocity produced by the first (and only) 5 rounds ranged from 1,848 fps down to 1,560 fps. Also, the shot group had a 7 1/2 inch verticle string (although the horizontal variance was very small).
So I'm thinking that my problems might be caused by the large amount of excess case capacity in these .30-30 cases.
I'm thinking that I probably need to use some sort of "filler" to keep the powder in a constant position (in relation to the primer).
I think Kaypok is the most common filler material used, but I don't have any of that.
What I do have alot of is common household fibreglass insulation. (Because I just added an addition a couple years ago and bought more insulation than I needed).
What is the general opinion about using this "Owens-Corning" solution? Is it as safe to use as Kaypok?
Does anybody have suggestions on some other material?
I've heard of using cream of wheat in straight wall cartridges, but I don't know if that would be safe to use in a bottle neck cartridge due to (what I've heard is) it's tendency to form a firm "plug" that scrubs the bore as it is pushed down the barrel. I'm thinking that it might build up pressures to a dangerous level while it is being forced through the constricted throat of a bottle neck cartridge.
Of course, like most things in life, I don't really know what I'm talking about here.
So please provide some guidence.
Thank you in advance!