Powder Thrower

[jim]

I have a RCBS Uniflow powder thrower and am having problems with some larger kernel powders hanging up - amy ideas on how to get the powder to flow better is appreciated. I thought I had read about wiping down the inside of the thrower with a dryer sheet. The powder is hanging up in the neck.

Thanks much!

 

[Stephen Perry]

Open Drop Up

jim
I would suspect your powder is bridging because your drop tube is a small inside diameter tube. Try a larger inside diameter tube. Static is not your problem.

Stephen Perry
Angeles BR

 

[abintx]

Jim ...

I have a RCBS Uniflow powder thrower and am having problems with some larger kernel powders hanging up - amy ideas on how to get the powder to flow better is appreciated. I thought I had read about wiping down the inside of the thrower with a dryer sheet. The powder is hanging up in the neck. Thanks much!

I had one of those once. Replaced it with the RCBS Charge Master 1500 Combo and never looked back. What a world of difference.

 

[Larry Elliott]

Is the powder hanging up at the outlet from the measure body, i.e., bridging, or is it sticking in the drop tube?

When I used a Uniflow I never had trouble with bridging, but with fine ball powders there was enough clearance between the body and rotor that it would begin to bind.

 

[mike in co]

hanging in the neck is typically refered to as bridging.

try opening up the top of the screw in funnel, the a little from the bottom till allmost full size to the case neck.

do a double tap on the bottom stroke may help.


mike in co

 

[John Kielly]

I recall one investigation I read on the performance possibilities of powder throwers - one that supported the conclusions with tabulated results checked on laboratory scales - recommended strongly against tapping on the either stroke & likewise use of the little dangly thing on the old Lyman throwers.

 

[MarkR]

I recall one investigation I read on the performance possibilities of powder throwers - one that supported the conclusions with tabulated results checked on laboratory scales - recommended strongly against tapping on the either stroke & likewise use of the little dangly thing on the old Lyman throwers.

For what it's worth, I think that tapping of any kind has an additive effect to powder compaction, and thus, is not good for the consistancy of thrown charges, especially over a long string.
I have recently purchased an RFD measure at the advice of a couple of friends that shoot BR. Once grounded and degossed it will throw very accurate charges, probably within 2/10ths, 70% or so in a string of 100 will be pretty much right on the money...but there is always that one or two that you wonder where in the hell that came from. Secondly, I'm not convinced that any of the top flight measures are much better than the other ones. Compared to my highly modified Lyman 55 I see very little to any difference.
I think that I will start competing in BR using only thrown charges, but I may be convinced otherwise farther down the road...We'll see!
Mark