Not Your Father's 30-30 Winchester!

[462]

Allen,
Those blue practice bombs were the BDU-33* and were used by the Navy and Air Force. A 25-pound dummy bomb (Bomb, Dummy Unit) that was used to simulate releasing a 500-pound bomb**.

After returning to the World, I loaded many thousands of those on F-4Es, while stationed at the old George Air Force Base.
It wasn't anywhere near as much fun as loading the real items! (See **)

*Qualifier: Had to rely on Duckduckgo for the designation.
**Qualifier: I'll never forget that designation -- Mk. 82

 

[Ian]

I heard those called "dirty bombs". They had a small charge to deploy a marker of some kind and were commonly used because any live ordinance ranges became permanently off-limits to any other exercise due to possibility of unexploded ordinance scattered about.

 

[462]

Ian,
A smoke generating charge was placed in the bomb's nose, to mark where the bomb hit in relation to its intended target. My memory is a bit spotty, but I think the charge was held in place by a simple cotter pin.

Also, there was an orange 5-pound practice bomb. That spotty memory can't recall what it simulated, but the other most commonly used (at the time) were 750-pound bombs and 750-gallon napalm canisters.

Obviously, 5 and 25-pound bombs were much less costly to produce, and the Viet Nam war was still very much active. Stateside 20 mm ammunition had dummy projectiles, rather than the HEI (high explosive incendiary) projectiles.

 

[JWFilips]

Well Since I home I cast up a bunch more of those! But this time i used smoke's Clear!

 

[Ian]

25 pounders?

 

[Glaciers]

Talk about thread drift. Wow.

 

[Cherokee]

From 30/30 to 750# bombs...real drift here.

 

[fiver]

pfft.. we are' on page-2.

 

[Ian]

Talk about thread drift. Wow.

This is nothing.

 

[richhodg66]

7 grains of Unique worked finebwith NOE 247s, great fun!

Will a .30-30 stabilize those long bullets designed for the Blackout? I wouldn't have thought so.

 

[Ian]

Me neither, Rich, based on ballistics tablature, but you never know until you actually try. 12" ROT Savage 219 stabilized the 247s well enough to blow up old cow pies on the 100-yard berm with buck/bead sights. I didn't shoot paper, so I don't know if they were yawing or not, and the cow pies didn't care either way.

The 16" ROT .35 Remington didn't stabilize 220-grain bullets below about 1200 fps though. I had to switch to lightweight handgun bullets for subsonic loads in order to to hit anything with that. Moral of the story is try stuff and find your own limits.

 

[RBHarter]

The 325 Sav 30-30 I had was right at the cusp with the NOE 230 but I don't remember now if I was trying to make it a 1000#@100 or an SBD (silent but deadly to coyotes and below) .

 

[fiver]

some 30-30's are 10 twist anyway.
they sorta standardized twist rates but nuthin says you have to use x or xx to 1
there are 10-11-and 12-1 308's out there and 10-12-1 30-30's plus sometimes the cutter rotator guy had some boredom to deal with and close-nuff is good nuff days.

 

[richhodg66]

Somewhere, I have a nice 311001 mold, an old Ideal plain based flat nose that weighs a little over 240 grains. I cast up some, dang that's a long bullet!

Anyway, shot some as fast as I dared shoot a plain based bullet and they showed significant yawing at the close range I shot them at. I suspect and farther and I'd have had key holes. This was from a Mauser sporter which I assume was 1 in 10".

I found some of the bullets the other day, maybe I need to find some plain based gas checks and try these in some other rifles.

 

[popper]

Garland used to have the ol bomb factory - where they made the castings. Had a couple 500# castngs out in front for a long time. Down the street was the pickle factory and then up the road was the Stetson plant.

 

[358156 hp]

This is nothing.

The only downer about thread drift here is that some of the drifts can be more interesting & informative than the original topic. Then it gets challenging to remember which thread we drifted of onto things like the synthetic oil drift, or the aviation grease drift.

It also makes me review any topic that has a basic answer, but goes into about three pages. Those threads all need to be read in their entirety. That's my thread drift, in response the the original thread drifts drift. If you get my drift.

 

[Ian]

Rich, yawing doesn't concern me much, tumbling does. Just because a bullet yaws way on out there doesn't mean it can't group. Here's a 4-shot group at 100 yards from a suppressed, 20" Savage 111 .308 Win. Lee 230-5R, powder coated, enough Titegroup for about 1000 fps at the muzzle. Yawing badly, but still grouping from a 10" ROT. The boat-tailed bullet still yaws a bit but groups sub-moa from all of my three Blackout ARs, two 8" and one 7" ROTs.

 

[Ian]

These were all recorded at 50 yards from an 8" 300 BLK AR, flat-based ACE 235 grain bullet similar to the Lee, plain lead lubed with a soap lube (SL-68.1 I'm pretty sure).

I think the boat tail design is a lot less effective at damping yaw than the flat base.

 

[popper]

30/30 Marlin @ 50 slow 170gr PB to get scope drop. Fun to shoot. circled group and cross - lots of drop but got the scope doped now. Funny, 100 yd drop about the same. Other holes PIA was someplace around 'Load:' Just sand bag on front, me on back.

 

[JWFilips]

Some times with low node shooting When I just start to get bullet yaw at 50 yds I get to most accurate targets! I remember Ian or Fiver explaining this to me