quote:

Originally posted by Gerard:
Contact Gina at www.gscustomusa.com for FN bullets. They are now producing small numbers of product and any catalog item can be ordered from her. Contact me on gerard@gscustom.co.za for tech data, should it be needed. HV and SP bullets will be made in the US within the next four to five weeks.

Post yesterday by Gerard, above.
Post today by Gerard, below:

quote:

Originally posted by Gerard:
I have not seen this picture before. An FN when you need it and an HV when you want it.

Can anybody point us to an image of the latest design of the .510"/450-grain HV?
With a BC of .328 at 2600 fps and .332 at 2100 fps claimed,
it is a one-shot buffalo "stopper" at close range,
and good to 300 yards for non-DG chores.
Add a proper solid, for elephant and hippo, and your "500" is good for any game.
I have good loads for the 450-grain HV, in the 500 Mbogo, at 2654 fps and 2835 fps.

The first design of this bullet looked like this:



Drive bands on my first batch of this bullet were .512"-.513" in diameter, IIRC,
greater in diameter than the .511" diameter of the 500 Mbogo free bore.
I pushed the GSC HV bullets through a .510" Lee Bullet sizing die, and went to town with the 500 Mbogo.

I wonder if the current design of the .510"/450-grain GSC HV bullet is actually .510" diameter?
If so, it is a perfect "all-purpose" hunting bullet for the
500 NE
500 Jeffery
500 A-Square
500 AccRel
500 Mbogo

I had wanted to test the GSC in the long throat 500AccR.

Unfortunately, CustomBrassandBullets did not have them in stock and I leave the US in a couple of weeks for a season. So I'll probably rebarrel before I find out if they would have worked and how well they would have worked in a .511" diameter 1.25" parallel freebore.

416Tanzan,
GSC HV bullets are famous for low start pressure,
you can drive then down your bore with a wooden dowel and a tack hammer ... IF they match the groove properly!!!!
They would have surely skidded in the 2.5X-bore P-S-freebore length, soon as they hit the leade of the lands.
Smart to throat sanely.

It sure was strange to have to resize the CNC bullets with a Lee bullet sizer before using them.

They are now advertized at .510" diameter for .512"-groove/.500"-bore, 500 NE and 500 Jeffery:
http://www.gsgroup.co.za/510450HV111.html
However the 650-grain and heavier HVs for 50 BMG are also advertized at .510" diameter for .509"-groove/.500-bore.

The best combo I could find for any 50-bore/.510-groove, all-purose hunting rifle was
the GSC HV 450-grainer (sighted 2.5" high at 100 yards) and
the GSC FN 570-grainer (sighted 0.0" high at 100 yards).
The latter should be the only bullet needed for the Luddite 500 Nitro Express double rifle.



Funny how the 450-grain HV on far left above looks fatter than the 570-grain FN next to it, eh? Both are supposed to be .510" diameter?
Well, the FN from GSC was.
What is the diameter of the latest redesign of the 450-grain HV, and what does it look like please?

I am not sure that the problem is the freebore length. If a GSC produces inaccuracy because of skidding I would fix the bullet and not fiddle with the rifle. Here is one that skidded initially in a 460 Weatherby and it produced good accuracy.



This pic is from this page: http://www.gsgroup.co.za/faqdrivebands.html

The reason for variances in GSC .50 and .510 bullet sizes is because that is what the CIP standards ask for. It is not good practice to resize a drive band bullet because, amongst others, you do nothing to the shaft size. Only the drive bands are sized and the relationship betweeen bore/groove/freebore diameters is destroyed.

I will get a pic done of the new 510450HV in the morning. Diameter is .512" (13.000mm).

Gerard,

So the bullet should be listed as

512450HV
not
510450HV

I can get sub MOA for 3 shots at 100 yards with the bullet sized down to .510" on the bands,
and the .500" land/bore is still a good match.
And the .511" diameter freebore to leade transition is a nonissue.
Not so if bands are left .512" diameter in the majority of rifles (numerically in this world) that could use it.

If you are so prone to fixing bullets instead of rifles to prevent skidding in an overly long freebore,
why not fix a bullet so that it will fit into a normal free bore?

quote:

So the bullet should be listed as 512450HV not 510450HV

Then I should list the 257080HV as 256080HV, 264110HV as 266110HV, everything starting with 270 as 277 and so on. As it is, most guys who look for a 318 Westley Richards bullet do not find the 330165HV.

That is why I have this type of list for the various bullet styles we have.

http://www.gsgroup.co.za/hvtech.html

Instead of resizing a GSC bullet, just tell us what we should make it at. That way you wind up with a better bullet.

http://www.gsgroup.co.za/faqwhichbullet.html

CIP specs for bullet diameter (maximum) and groove diameter (minimum):
500 Jeffery: 0.5098"(12.95mm) and 0.5110"(12.98mm)
500 NiroExp: 0.5098"(12.95mm) and 0.5118"(13.00mm)

Gerard,
Your bullet is oversized .001" for a 500 Jeffery barrel,
and
your bullet is oversized .0002" for a 500 Nitro Express barrel.
Since the minimal bands allow wiping and skidding so easily, they get by.
Easy to size down to .510" in a Lee sizer too.
But that is ridiculous, agreed.

I am now aware that I must specify .510", not wanting a .512", for the 510450HV.

Reminder: Got a picture of the new 510450HV?

That skidding 458450HV in a 460 Weatherby did so in a throat that was likely .750" parallel-sided freebore length.
I doubt the 1.250" P-S free bore length of the 500 AccRel would fare as well.

Doesn't look like GSC makes the .395 bullets anymore.

Look at 395340HV http://www.gsgroup.co.za/orderhvusa.html or
395340FN http://www.gsgroup.co.za/orderfnusa.html or
395340SP http://www.gsgroup.co.za/orderspusa.html

quote:

RIP,

It looks like the rifling scraped the shank down the full length of the shank. Is that the case? If so perhaps the shank diameter needs to be slightly smaller...especially as the bore diameter of many .510 caliber barrels are spec'ed with a .4995" bore diameter.

Jim,
The bullet above is a 450gr HV fired from a 460 Weatherby Mag with a long freebore and shallow leade. The bullet is correctly sized and it was accurate. The shaft of the bullet should run on the faces of the lands. If it does not, accuracy is spotty.

Below is the 510450HV

Gerard,
Thanks.
510450HV111 looks good.
Should be great in a half-caliber-length free bore. Low start pressure, minimal bearing surface. Hopefully will be OK in my caliber-length free bore.
New: 4 bands, progressively narrower band width from nose to base, and boat tail
Old: 8 bands, all equal width, and flat base

Very nice looking bullet.

any estimate on the new BC?
I'm going to guess around .350-.380 BC for the new design.

Gerard,
Sorry I missed them. Blame it on not enough sleep the night before and a busy day.
Max

quote:

Originally posted by Gerard:
Instead of resizing a GSC bullet, just tell us what we should make it at. That way you wind up with a better bullet.

I ordered very specific some .510" diameter 570grs FN`s because I got some .512" diameter 540 grainers first where they were difficult to chamber because freebore is .511"
BUT I GOT .512" DIAMETER BULLETS AGAIN!!!!!
And I get no reply from your Scandinavian distributor... I am getting tired I must admit... What is your plan?

Ulrik

Ulrik,

It appears you need to follow RIP's suggestion and pick up a Lee .510" sizing die...

I got a reply just now from the Scandinavian distributor, he is very sorry, but nothing he can do other than refund me the money if I return the bullets to him... Think I will do just that.. He says that GSC is refusing to take orders of "Custom bullets" from now on... hahaha - custom .510" diameter bullets... yep - very "custom"....

Did someone say North Fork? Or Cutting Edge? .......................

Or maybe we should change the topic to
GSC Bullets: Made in Hong Kong?

quote:

Originally posted by capoward:
Ulrik,

It appears you need to follow RIP's suggestion and pick up a Lee .510" sizing die...

well, I've got the die now, just need some bullets made in the usa.

Just ordered the .510" sizingdie as well... Will try it on the first order of GSC FN's which where also .512" diameter...