30-357
Derek
[subject]
Saturday, July 28, 2018, 08:54 (2963 days ago)
I had a 300 blackout handi rifle sent to David white to have a counter bore cut so i could use 357 magnum brass for a rimmed 300 blackout, it sizes in the 300 blk dies,with a short neck for heavy subsonic bullets, 360 dan wesson brass gives full size 300 blk rimmed brass. I was wondering how close in performance the 30-357 would be to the 300 Gnr, with light 30 cal bullets 110 dr, 125 gr etc , possible in a Blackhawk conversion? Think it would be neat to have to go along with a rifle in the same caliber.
Thanks guys
in a revolver the 300 GNR with a 110 grain bullet will do
Gary Reeder
[subject]
Saturday, July 28, 2018, 09:46 (2963 days ago) @ Derek
2200 fps. With the 125 it will do 2100 fps.
Isn't the new .321 GNR a ".308-.357"?
WB
[subject]
Saturday, July 28, 2018, 16:36 (2963 days ago) @ Gary Reeder
By measurement the .300 GNR is a .401 Herters necked to .308, or .30-30 based .30 Herrett "short" cylinder length. Over a .357 based version the .300 GNR has super thick and strong brass with an ample hefty rim. They last tons of loads and are almost indestructible.
Gary's .357 version is a little bit easier to make by simple FL re-sizing/necking operations. The .300 GNR requires a .30-30 to be run through an extra form die and cut off. Not a big deal but an extra step. I actually enjoy the operation.
30-357
Derek
[subject]
Saturday, July 28, 2018, 19:22 (2963 days ago) @ WB
What is the main difference between the 300 Gnr and the 321 Gnr power wise ? Is there much case capacity difference? I see the 321 uses .308, 311 or 312 bullets.
The capacity of the .300 GNR is a little over 20+ gr.
WB
[subject]
Saturday, July 28, 2018, 19:49 (2963 days ago) @ Derek
You can figure the .357 necked with bullet seated at around 20-25% less. Actual power might not be too much different in a revolver, a carbine or single shot is another cup of tea.
I have no experience with the thinner cases .321 GNR (I should have taken Gary up on the choice of a new cylinder but I already had the .300 GNR and wanted a .327 so I could shoot any straight rimmed .32)
The historical origins were Gary wanting to make a .300 Herrett version of a revolver round. Later with the popularity of it growing he thought a little easier forming might help, but he didn't want to overlap the original too much. (A brilliant business move) The .321 GNR was the result. Gary like many manufacturers uses .308 barrels which most shoot .312" bullets fine. I cuss Ruger for making SSM .32 H&R barrels in .311 that spread .308" bullets all over. DW and TC, to name two, have always used .308 barrels for .32's just fine.
the difference is about 20 years and almost 1000 fps
Gary Reeder
[subject]
Saturday, July 28, 2018, 21:42 (2963 days ago) @ Derek
I developed the 300 GNR almost 20 years earlier than the 321 GNR. I had heard so much about how powerful the 327 Federal was I decided to develop one much better. The 300 GNR requires a lot more work and time expended to get a cartridge ready to use, whereas the 321 GNR takes a simple sizing of the 357 Magnum cartridge to get the brass ready to load. The 300 GNR and 321 GNR are ballistically identical but one was much easier to load. That was the 321 GNR. It is almost 1000 fps faster and much more powerful than the 327 Federal with the same weight bullet. It made the 327 Federal obsolete.
321
Derek
[subject]
Sunday, July 29, 2018, 05:11 (2963 days ago) @ Gary Reeder
I have my donor gun, now just to squirrel some money away lol. Looks like the 321 gnr will be the way to go. Now deciding between the custom options, javalina, coyote etc. Sure like looking at those sixguns.
you are asking about a cartridge that already exists
Gary Reeder
[subject]
Saturday, July 28, 2018, 23:11 (2963 days ago) @ Derek
our 321 GNR is a 30-357. It is already a registered cartridge with dies and load data.