Duplexing?

[Stealthshooter]

I've been tossing this idea around ever since I had the missfires with my first 296 loads. Why can't we load just a few grains of a easily ignited powder along with our 269,297,H110 loads?

Then I ran onto this thread today http://castboolits.gunloads.com/showthread.php?t=118453

What do ya think?

[wildcatter]

I've been tossing this idea around ever since I had the missfires with my first 296 loads. Why can't we load just a few grains of a easily ignited powder along with our 269,297,H110 loads?

Then I ran onto this thread today http://castboolits.gunloads.com/showthread.php?t=118453

What do ya think?

Just my opinion, but it's just too dangerous and unnecessary. It shows you are thinking out of the box, but this is a strategy for extreme experts. I've done it, but holy cow, controlling the burn is nearly impossible and we've got so many fine powders, to do anything you want....

Just this afternoon, I bought some MP-300, that new Alliant powder, in the 296 burn rate area. My point is, just when I'm comfortable with things and powders, in this case, something new comes around, to further inspire.

I restate, doable, but until you have exhausted the front line powders and obtain a PHD in applied Pyrotechnics, you might want to try skipping Duplexing/Triplexing, etc..

..t

[Stealthshooter]

I have not heard of the MP-300 Def let us know how it works!

I am liking the results I'm getting from my H-110 loads but it still makes me nervous thinking about getting it lit when the temps start to dive around here in the not so far future.

[commander faschisto]

I'm sure several folks around the campfire here can tell you all about low-temp powders...we have a large contingent from the Great White North. Whatever you do, don't mix them...like the old saw about mixing beer and wine: You're going to have one hell of a headache afterwards!

[BD1]

In any circumstance duplex loads are not something to be undertaken lightly. And, in the .450B we are well outside of the parameters which typically would lead one to experiment with duplex loads. The typical duplex load uses a very small amount of very fast powder, (think Bullseye), to light a full case of very slow powder, (WC860, 872, 5010), in a case in which the pressures produced by the full case of slow powder are still well below the sammi spec even when lit up with a bang. The slowest powders we're using in the .450B are still "fast" powders in the overall ranking of smokeless propellents. Reliable cold weather ignition is achieved with primers rather than duplex loads. In my experience, a large rifle primer will light up 296 reliably no matter what the thermometer says.
BD

[wildcatter]

In any circumstance duplex loads are not something to be undertaken lightly. And, in the .450B we are well outside of the parameters which typically would lead one to experiment with duplex loads. The typical duplex load uses a very small amount of very fast powder, (think Bullseye), to light a full case of very slow powder, (WC860, 872, 5010), in a case in which the pressures produced by the full case of slow powder are still well below the sammi spec even when lit up with a bang. The slowest powders we're using in the .450B are still "fast" powders in the overall ranking of smokeless propellents. Reliable cold weather ignition is achieved with primers rather than duplex loads. In my experience, a large rifle primer will light up 296 reliably no matter what the thermometer says.
BD

10x.. and magnum small rifle primers, will light h110/296 without any problems at all and we've got weather here, that will rival yours. If you are not sure, try putting some of your cartridges in the freezer and giver ah go..

..t