Has any one tried Lyman #375449 in a 375 H&H? It is a 264 gr gas check that I plan to hunt moose with this fall. If you have used it what powder worked best for you and what Brinnell hardness did you use? Did you water drop or bake them? Did you use crimp on gas checks or the non crimp checks? Were the gas checks annealed? Did you use any fillers? I am desiring the best load posible to push this bullet between 1800 and 2000 fps.

Thanks, Leon

I'm not sure if the 449 is a GC bullet , but i have both the Plain base 255gr and the GC 287grain bullet moulds . What alloy your are using is going to depend on your groove diameter and the velocity of your load ! Most moulds cast in the .375 range , but some of these bores are .377,380 and over ! If you have a larger groove diameter then your load will have to bump up the bullet on ignition to get accuracy ! The bullets will work but load developement is up to you ! JAGG

I use that bullet in my 38-55, I'm driving it circa 1900 fps cast from 20:1 and using Hornady gas checks, I don't anneal them, see no need. Bullet shoots great. On something like moose, It seems to me that simple aircooled wheel weight would work well. Moose offers a bit more resistance than southern whitetails, hence my choice of 20:1. This bullet has a .25 meplat, so I think anthing harder than aircooled WW won't open at all. The 48th Lyman manual has a nice picture of one of these recovered from a hog. They say the alloy was about 10 BHN....20:1 or WW. I see no reason that the bullet shouldn't work in the H&H.

Leon

I've used the Lyman in my 375 Whelen. I have 2 two cavity Lyman molds. One is straight factory stock and the other has one cavity lapped out a few thousandths to engage the bore.
I found the Lyman design to be a very accurate bullet, but I was shooting water dropped alloy of WW and tin, with annealed gas checks. The RCBS and the Saeco 250 grainers were more accurate in my rifle, of the same alloy. The best of all is the NEI 300 grain with a long bore riding nose.
I've never shot anything living with this rifle but taking into consideration the penetration of all four of these bullets I'd bet that you could shoot through several moose and a pickup truck.
I'll be working up some loads this summer with IMR 3031 and IMR 4895.
With water dropped at casting bullets I'd not be concerned using jacketed bullet loads.
Jim