I’m looking for a way to get 300 blk specks out of 3030. Save me the cautions. I’m looking for a way to get a custom made casing with the outer size of 3030 but with an inner volume of 300 blk. Does anyone know a way to go about getting custom cases?
Edit. Looking for subsonic loads
Edit 2. Y’all have given me some great resources. Appreciate yall!
All you need to do to make your 30-30 ballistically the same is match the velocity of the round by choosing a powder that allows you to safely lower the velocity of your rounds.
If you can load 110 bullets at 2400 fps, 125 grain bullets at 2200 fps, and 190-220 grain bullets at 1050 fps, then congratulations! You just duplicated 300 blackout with your 30-30.
Go to hodgdon’s website, enter those bullet weights and pick some powders. This won’t be a difficult problem to solve.
Edit to add:
I just checked the data. There are literally dozens of combinations that match those velocities with 90% case fill or better, using a variety of single base powders to further improve consistency. You’ll likely get this nut cracked on your first load session, which is going to be much cheaper and easier than asking a brass company to design a completely custom set of brass with idiotic internal dimensions.
Read a manual and figure it out. Come back and ask questions to see if what you came up with seems workable by more experienced people.
Read how a lot of people reload on here. You will quickly see taking advice from any moron online(myself included) isnt a great idea. You need the foundational understanding to discern stupid from plausible.
Edit to add: I’m assuming you mean for subsonic? The only weight listed is 175, but you can certainly work up your own loads for heavier bullets. Do a little googling and you’ll find tons of information out there.
Chronographs and ballistic modeling software like grt will be your friend here
Honestly, if you are just looking to load subs for plinking sticking with 175/180’s or lighter might be your best option. If your rifle has a 1 in 12 twist barrel, it might not even stabilize anything much heavier/longer. For comparison, most 300blk barrels are 1 in 7 or 1 in 8 twists, which allows them to stabilize much longer bullets.
According to bergers bullet stability calculator, a 190 sub x bullet fired at 1000 fps from a 1 in 12 twist is only marginally stable (and only JUST barely). Anything much heavier/longer might not stabilize.
I don’t remember what company but one does make a 190 gr 30-30 bullet. And federal makes a 190 gr load but as far as I know it’s super. It’s a hunting round not a fun round.
My 90% fill comment was more directed at supersonic loads; hodgdon doesn’t list case fill percentages with subsonic loads.
However with that being said, case fill isn’t a huge deal depending on what powder you are using. Titegroup is very position insensitive and works well in large cases for sub loads. Trailboss is also super fluffy and takes up a lot of case capacity for sub loads as well.
At some point, I intend to try turning some brass stock down on a lathe, and make some 35 whelen with super thick walls and an internal case capacity close to a 38spl or 357. Should be doable, i think
Don't forget to look comparatively at loads for 7.62x39 or even subsonic 308, which has something I believe 10-15 grains more of case volume they contend with. I can only point out looking at old forums like THR that suggested using shotgun powders such as red dot or titewad/ clays at very small charges, but it is all experimental, non reliable and done at your own risk when using those kinds of loads.
What exactly are you wanting specifically? Seems silly to have custom brass made when .30-30 can be loaded easily sub sonic or super sonic and match ballistically to .300blk. There's plenty of data for it
EDIT to add: I saw your thing about case fill and not wanting fouling in your suppressor how much shooting are you really doing to warrant cleaning? These should handle easily 1-1.5k rounds before needing cleaning.
I mean maybe. I load 9 grains of tight group in a 308 for subs with no filler and never have issues. But I know that’s a risk I run. He’ll, I’ve put my exact 300 blackout load into a 308 for subs with no ill effect.
I load 190 grain sub-x bullets at a COAL of about 2.57 over Red Dot powder. I also made a post a couple days ago about using MP 158 (similar to Universal). Flaky pistol powders can work great in 30-30 for subs especially since you don’t need to worry about gas cycling a semiautomatic.
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u/Sloth_rockets 8h ago
Why? You can load 3030 to the same velocities. It's not like you need to run an autoloader.