One thing I love is pistol bullets being used in big bore cartridges. 10mm Auto and 400 Legend is becoming more popular and thus more pistol bullets available. I was thinking that like the 40 BSA there can be more .400” or 10mm big bore cartridges. 10mm-308? 10mm Whelen? A 10mm Whelen with pistol bullets should be able to use short actions (2.8”-3”) a 308 cartridge could just be necked up with the same shoulder diameter and have a small shoulder like the 400 Whelen has. On the 06 case, a 10mm bullet would be a tad larger than the 400 Whelen. I think a 10x57 would be a great cartridge for Mauser actions and fit nicely in short actions. A good pig smashing round to be sure. 10mm Njiri? That’s what they call a warthog in Kenya. A good Pumbaa cartridge. Disney would send a cease and desist letter if I did that 10mm Kiboko (Hippo in Swahili) would be a good name for a 10-9,3x62 variant. Just a simple neck up. There could be a good argument for the resurgence of the 40 BSA from 1921. The 40 BSA is .400” bullet with taper and no shoulder on a 375 HH case but I think it was around 2.6” case length but not sure about that.

Well some of the stuff you wish sorta exists, almost. The 10mmx57, there's the 9.3x57. Also there is a 400 Whelen. You might like the 375 Raptor, look it up.

Don't forget the 10mm Magnum. I've been playing with it in a revolver lately. Starline makes brass.

I have shot thousands of pistol bullets in rifles.

I have found the that the performance at rifle velocities leave something to be desired.

Fun to shoot, cheaper to shoot but then performance on larger game can be lacking.

Yes, some pistol bullets are not good at large game but the 10mm has bullets literally meant for bear. I would find out what the bullets do at higher velocities and adjust. My initial thought was to make a 30-30 straight wall with 10mm bullets. I think that would be a fun round and probably push 180 grain bullets around 2,000 fps at the muzzle easily.

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My initial thought was to make a 30-30 straight wall with 10mm bullets. I think that would be a fun round and probably push 180 grain bullets around 2,000 fps at the m

Yes that would be a fun round.

Meant for bear at pistol velocities is different then meant for bear at rifle velocities.

Over expansion and under penetration can be a problem when using pistol bullets at rifle velocities.

I am not against it and it can be a lot of fun.

Just be careful

I built a 35-40 last year on and cut down old Krag rifle I had. Very impressed with it.

A 405 winchester short using 303 brass and 405 dies maybe worth a look at. Not .400 but very close and you can use pistol bullets

303 tapered not necked to .400 would work as well but would require a reamer and custom dies. Would be legal to deer hunt with in several states as well.

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Originally posted by p dog shooter:

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My initial thought was to make a 30-30 straight wall with 10mm bullets. I think that would be a fun round and probably push 180 grain bullets around 2,000 fps at the m

Yes that would be a fun round.

Meant for bear at pistol velocities is different then meant for bear at rifle velocities.

Over expansion and under penetration can be a problem when using pistol bullets at rifle velocities.

I am not against it and it can be a lot of fun.

Just be careful

Solid copper or brass would obviously be best at high velocity but hog velocity could be 2000 FPS at the muzzle and much less at 100 yards. I think the best use case would be a 30-30 case and a 308 or a 57mm case unless you are swaging down 405 bullets to match the 405 Win in a smaller package.

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Originally posted by buckdeer:
303 tapered not necked to .400 would work as well but would require a reamer and custom dies. Would be legal to deer hunt with in several states as well.

Lots of fun options have been bouncing around in my head like a sped up pinball machine

We made a couple of AR-15 barrels for the 10mm SOCOM. Not much interest in it, so it never went into production. At the time, there were some 40 caliber rifle bullets available (blems) that were meant for muzzle loader sabots.

I also have an 8" LAR Grizzly chambered in 10mm Magnum, an Automag IV in 10mm Mag, and an M1 carbine in 10mm Mag.

Tony Rumore
Tromix

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Originally posted by TonyRumore:
We made a couple of AR-15 barrels for the 10mm SOCOM. Not much interest in it, so it never went into production. At the time, there were some 40 caliber rifle bullets available (blems) that were meant for muzzle loader sabots.

I also have an 8" LAR Grizzly chambered in 10mm Magnum, an Automag IV in 10mm Mag, and an M1 carbine in 10mm Mag.

Tony Rumore
Tromix

Love your stuff!!! IMHO I think the AR10 is the right size gun for the 10mm. Supersize a 57mm case to make essentially a super sized 300 blackout. 400 Blackout? 400 Trom-Com?!?!?!?!??? 10 Tromix? 210 grain Hornady interlocks @ 2,300? squish down 300 grain 405 bullets for 300 grains @ 2,100fps??? 400 grain .400” subsonic?

I built a 40x1.8" to be used for deer hunting in the Special Rifle Zone in Southern Michigan over 12 years ago. It will push a Cutting Edge Bullet 165 gr. Raptor at 2800 fps. I use 30-06 brass cut to 1.8", its a great cartridge. It was the only bullet made suitable for deer hunting made when I developed the cartridge, now there a few with the 400 Legend on the market. I tried to have Remington, Winchester and Federal go for the idea of the cartridge but they really didn't even want to look at it. Part of the problem is its to long to fit in a AR-15 magazine. maybe if I shortened it to 1.7". They might have been taken into it but the 400 Legend at 1.65" was taken but on a very slow pace.