I just ordered two boxes of A-Square monolithic solids for my 404 Jeffery. I understand that these bullets create quite a bit more internal pressure than jacketed solids.

Anyone have an off-hand idea of how much to back off a jacketed solid load to achieve the same velocity? I don't want to waste a bunch of them just to develop a load.

By the way, anyone else noticed how slim the pickins' are getting for .423 caliber solids? A-Square and Woodleigh are about it domesticly, I guess, now that Barns has dropped them from the line. (I know, I know -- Woodleighs are made Down Under, but they are readily available here. That's why I counted them as domestic).

There is a section in the A-Square handloading Manual Any Shot You Want, pp 159-162 that discusses your question. The basic reply is A-Square says the higher pressure story is just that. The details are in the book.

I recommend buying it, I think it is the best thing A-Square ever "built".

jim

Thanks for the reply, Jim.

So you are saying that, according to A-square, the story of increased pressure in mono-solid rounds is a bunch of hooey?

Not that I don't trust 'em, but I'm still going to back off my normal load a bit and work back up using a chrono to get back to 2400 fps. It's just that about $5.00 per popped cap, I want my throw-aways kept to a minimum.

GAhunter



Looking at the few loads that A-Square lists in the section on loading solids, it appears they drop an average of about 1.5 grains BELOW the soft loads, in 90 grain capacity cases and up to 7 grains below in 150 grain cases.



So higher pressures and velocity with mono's are not a myth. At least according to A-Square's data.



So, my conculsion is if you have a good 400 grain soft load for your 404, drop it say 3 grains to be safe, load three, crono, then assess how much your above or below your soft velocity/pressure, and adjust accordingly.



Bob