BASA, the Big Bore Association - Southern Africa (www.bigbore.org) would appreciate historical, technical, reloading (all known propellants from Accurate to Vihtavouri including Somchem) and performance information on the cartridges below for use in future issues of its full colour, premium quality, Big Bore Journal magazine and its data compilation guides published from time to time. It will be greatly appreciated if Accuratereloading forum members would be so kind as to:
1. Put BASA in touch with anybody reloading for these cartridges;
2. Spread this request through all internet forums and associations with a view of soliciting the info.

All contributions will be acknowledged. People with info can contact the BBJ editor direct at [u]africanhunter@bigbore.org[/u]:

The cartridges in question are:
9,5x57mm Mannlicher-Schönauer
.375 Ruger
.400 H&H Magnum
.500/416 NE Krieghoff
10,75x68mm Mauser
.425 Westley Richards
.577/450 Martini-Henry
.450 No.2 Eley 3½†Nitro Express
.460 G&A Special
.450 Rigby
.465 H&H Belted Magnum
.470 Capstick
.476 Westley Richards NE
.510 Wells (plus development history etc.)
.550 Magnum (plus development histiry etc)
.600 Nitro Express
We really look forward to the assistance of the experts participating in this excellent forum.
Pierre van der Walt
Editor - BASA publications

I sent you a PM on some of these things, including that the creators of many new rounds are here

Pierre,
I would join your organization to subscribe to your fine journal if I could do it simply with a credit card. Last time I checked it required a wire transfer of funds for a tiny amount of money. That is an impulse stopper. I do have one of your journals and digital access to some other of your materials thanks to another fan of yours. Excellent stuff. Even if your middle name is VD.

I have some good data on the 470 Capstick I can get back with later. I'll post again to keep the thread alive.

Are you not interested in the 500 A-Square, just the .510 Wells? The 500A2 is simply MORE of the same as the .510 Wells. Other similar cartridges predate and postdate the .510 Wells, though I guess the "Wells" name adds a bit of charm. The 500A2 would be the most popular nowadays, in this bracket. I've got plenty of data on the 500A2 also.

Hopefully Neal Shirley will find time to share the .550 Magnum data specifics along with the velocity and pressure data on two different bullet weights he has unveiled here recently.

You might be interested in the new 577 Belted Magnum Express that is a cart currently under development. Basicly a 577 Nitro in size but for a bolt gun based on the 505 Gibbs case.

The 470 MBOGO?

RGB's 600 Overkill...

this is what i sent him, to catagorize these bigins ... +means partial help, and means sharing
You could also have the developers of rounds here on AR
for Example
the one that started it all
*470 mbogo Dave


all the .395 bullets RIP/Prof
423 fosdall
*416, 458, 470 AR Me/Paul H
500 AR Me
* 550 Magnum RNS
550 gibbs Rich
*550 express RNS+me
500KX rich
500 mbogo Dave/RIP
* 585 nyati (corrected by Rob) Rob
* 600 Mammoth biggest bore
* 600 Overkill Rob+Friz454
700 DA Ed +Friz454+me
700 Hubel Express Ed
* 12GAFH Ed/Rob/Fritz
585 belted gibbs (not sure what name) Boomy/Rich

quote:

585 belted gibbs (not sure what name) Boomy/Rich

The working name is 577 Belted Magnum Express.

Preliminary load data by Ed Hubel (Ed is the engineer for this project Rich is the facilitator/load development test pilot)has been done but the First one will go boom in about 2 weeks...does that sound right Rich?

Don't forget the 12GA FROM HELL!-ROB

quote:

Originally posted by jeffeosso:
...the one that started it all
*470 mbogo Dave

...* 12GAFH Ed/Rob/Fritz

No way would I forget Rob!

Jeffeosso. I have not received the PM yet but I am looking forward to it. Will let you know if I don't get it. All information is welcome on any big bore cartridge. We are at this stage just focussing on the ones with a long African history and a broad user/support base, but we will get round to the new developments soon. It is important to BASA to stay updated.

Jeffeosso - my manners! Thank you for assistance so far! Heishh my mommy will heat my rump!

RIP. It's not my middle name which is VD - it is first part of my surname. Hell! And I only cotton onto why my sex life is so quiet after 49 years! Going to lawyers for change tomorrow.
The cost of a credit card facility here in Mbekistan is about US$ 65 per month last time we checked and BASA does not do that amount of credit card deals a month. But we are growing and if you look at the new website you will see that it is vastly improved Should be able to justify a credit card system soon.
Looking forward to .470 Casptick info. Send the .500 A-Square stuff as we have locals (Carl Labuschagne) who uses it. I also hope Neal will share

Boom Stick. The .585 bore seems to be quite active of late. So - let's have history, characteristics, performance, reloading twirks and data. Thanks!

Pierre,
I sent you an email with the same data

Pierre,
Glad you took the Van Der joke as intended.
470 Capstick:

With so many toys in my chest to play with, I cut to the chase on loads.

First a survey of two sources from manuals.

Nick Harvey of Australia:
(23" barrel of unspecified twist, probably a 1:10" since made by A-square)
Notice the change in powders going from starting load to max load on the 600-grainer, single line entry in the table below.



A-Square manual data Any Shot You Want:
(26" barrel with 1:10" twist)
No errors here:



My rifle is a Winchester M70 with 26" McGowen 4140 barrel of 1:10" twist, probably the same make of barrel used by A-Square. You can compare my velocities to the A-Square data FWIW:

Now what I settled on from my trials of IMR-4064.
Iron sights at 100 yards:



And H4895 Extreme, also available as the Aussie ADI offering.
2.5X Leupold at 50 yards:







84 grains of IMR-4064 gives just over 2200 fps with most 500-grain bullets in a 26" barrel. It should be very accurate and I would have shown that had I used a scope.

85 grains of H4895 Extreme gives over 2350 fps in a 26" barrel with most 500-grain bullets.

Note the North Fork bullets are now .475 instead of .474.

The newer .475 North Fork Cup Point (semi-soft) and FP Solid were tested in my friend's Custom Shop Winchester M70 Big Five 470 Capstick.
This 24" barrel is also a 1:10" twist made by Winchester, may be a little loose as it keyholed with the .474" bullets but made nice round holes and small groups with the .475" bullets:
North Fork CP and FP 500-grainers of .475 caliber:
85 grains of H4895 Extreme
CCI 250 primer
A-Square brass
2297 fps
24" barrel

Powder lots vary. My results with H4895 were much closer to the A-Square data than were my results with IMR-4064. I am also using different brass and bullets, etc.

quote:

Originally posted by jeffeosso:
this is what i sent him, to catagorize these bigins ... +means partial help, and means sharing
You could also have the developers of rounds here on AR
for Example
the one that started it all
*470 mbogo Dave


all the .395 bullets RIP/Prof
423 fosdall
*416, 458, 470 AR Me/Paul H
500 AR Me
* 550 Magnum RNS
550 gibbs Rich
*550 express RNS+me
500KX rich
500 mbogo Dave/RIP
* 585 nyati (corrected by Rob) Rob
* 600 Mammoth biggest bore
* 600 Overkill Rob+Friz454
700 DA Ed +Friz454+me
700 Hubel Express Ed
* 12GAFH Ed/Rob/Fritz
585 belted gibbs (not sure what name) Boomy/Rich

Are you referring to the .606 Mammoth, created by BiggestGun?

I will get some information to you

Boomstick. I missed the .470 Mbogo bit. Yes - please let's have that too. I would need a lot of stuff. PLease send to me at africanhunter@bigbore.org and I can easily send you everything needed. Basically it entails:
Country & date of intro with history
RCBS Shellholder no.
Cartridge dimensional sketch
Average case weight with primer, source and water capacity
Barrel length, twist & velocity parameters for
different bullets
Barrel rifling details (no of grooves and width)
Bore & groove diameters
Case length
Reloading tricks including case forming
Source for components and tools
Data
Maximum average pressure limit

RIP. Thanks for that .470 Capstick stuff. Appreciated. I happened to have used the late Peter Capstick's .470 - the first one made. I am bit too electronically challenged to insert the photos but if anybody is not scared of contracting VD by taking my hand through the steps I could probably do it. Interestingly enough - Superior Ammo made us cartridges for it using Barnes bullets. Since the cannelure was cut for .470 NE and not .470 Capstick the bullets pulled out - jamming magazine after 2nd shot. I informed Superior Ammo who then apparently cut another groove to prevent recurrence! That could have gone ugly!

RNS - Thanks. Looking forward to it. Would you send it direct to my e-mail at africanhunter@bigbore.org as well? Please!

Pierre
did you receive my email?

What about the 458 Lott with 550 SP bullets at 2210 FPS.

Pierre,
I can send you my loading data on the 10.75x65 if you still need it.

Ray Atkinson. 10,75x68? Please let me have some data! Can you send it direct to africanhunter@bigbore.org as well. Then we have it here for all and on my systemn where I can save it well. Thanks in advance. Please add case brand and weight with primer and average case capacity as well as barrel length.

JRO45. All data is welcome - including 550-gr for Lott. The more the merrier. Thanks in advance

Jeffeoso. Got it. Thanks. You guys are a real help.

Pierre...

I posted the 470 mbogo website. That should have a bunch of info for you and the designer posts dave posts here if you want to ask him more questions.

The 577 BME will have more info on a few weeks.

Hey, Pierre,

Wait till I tell the boys at the next Big Bore Shoot about the VD infection amongst us! That must apply to half the members! Okay, I know I'm the only bloody rooinek there but my gun's bigger than yours.

Sounds like you are about to drown in info and data. Who's financing the new super-computer??

Looking forward to the new, improved edition.

Let me tell our American colleagues on AR Forum, the Big Bore Journal is a publication all big game hunters, reloaders and rifle nuts will enjoy. Join the Big Bore Association!

Ah! Mr Harland! How are your Richard? Now guys - here we have a true, blue-blood, long-time, Zim elephant slayer of note entering the fray. Thanks for the kind words about BASA and the Journal Richard - but as always - you cut throught he chase. VD is indeed a very common Boer surname affliction! I am still waiting for the flood gates to open on data but I have had some promising promises and great stuff on the .470 Capstick but no need for a new super computer yet.

470 mbogo posts here...did you go to his web site? Plenty of info there... www.470mbogo.com

Re. the 577 Belted Magnum Express...it will be up and running soon. Expect plinking loads, classic 577 Nitro loads and up to as much as the human body can withstand loads.

Pierre,

My .425 Fossdal is not done yet, but will be during this winter. As soon as I have data to rapport, I will!

Hi Pierre.

I have sent you my loading data previously regarding the 416 Wby and the 577 Tyrannosaur haven`t I??
I have just got the new 577 rifle after 4 years of waiting
I is a real beauty. And a pleasure to shoot Have tried 800 grs GS FN a 2500 f/s. That`ll be the ele-load for Zim next year..
All the best

Ulrik Hentzer

quote:

I have just got the new 577 rifle after 4 years of waiting

What took so long???

Ulrik. Ja - I have your data as well as the sample case and bullet. Keep us posted on your new 'sample varmint rifle'! Have you been leaving the seals in peace of late?

Bent. Thanks - looking forward to it. Can you send design speci in mean time? .425 Fossdal - is it .435 calibre and how does it compare to .425 WR if that is the case?

Robgunbuilder - what is that 12ga from hell. In my book that is a 12ga Gattling loaded with slugs and AAA alternatively?

12GA FH is the one on the right.
Made by putting 12ga size rims on bmg
brass.And then fireforming.
Rob's idea and his name for it.
We have a year and a half thread on it
in big bore forum. A lot of testing
and research.Ed

Pierre- The 12 GaFH will send a 1000 gr solid to over 3200 fps. You can also drive 3/4 oz sabot slugs to 4000 fps if you want to, then switch back to 2 3/4 birdshot if a quail wanders by.Yes its real and yes it works. I can send you a pic of the rifle I built for it as can Ed who played a major role in developing it. Just fill the case with RL-25 and hang on!