.375 GC for .366 (9.3)

[toolz568]

What is the trick to resizing the .375 GC on .366 boolits? I'm destroying the boolit and GC and don't want to damage my Lyman lub and sizer.

Has anyone tried making a GC maker for this caliber besides Corbin?

Thanks for all the help, I made a die that works great, see thread #11.

[I'll Make Mine]

Do you have a way to push the boolits through the sizer base first (or are you already doing that)? That should keep the GC pushed against the shank as it swages down the GC. Don't know if it'll resize the GC concentrically, though.

If that doesn't work (or you've already tried it), Freechex will make the Freechex II tool in custom size, according to their page, for what seems a reasonable price. That's a mallet operated, two operation check tool that will cut from the edge of a sheet of metal (or a strip), then form the check cup with a second strike. Given 'em your shank diameter, and they can make it fit.

[jethunter]

I used .375 gas checks on my NOE .368 boolits. I didn't do anything special. Slip the check on the base of the (unsized) boolit and then size it in the lubri-sizer, base first as normal. They come out sized, concentric and tight. I've loaded 60 rounds of 9.3x57 this way and no problems.

[Blammer]

I have some sample 9.3 GC's coming from gator.

I'll post when I have them.

[toolz568]

I did find an issue with my custom Lyman sizer, it is .367, not .368, but I don't think opening this up another .001 is going to solve my problem, but I need to do it anyway. I hope gator comes through with a 9.3 and it fits this mold, I really like this boolit design.

Jethunter, what type of sizer do you use?

[tjones]

I did find an issue with my custom Lyman sizer, it is .367, not .368, but I don't think opening this up another .001 is going to solve my problem, but I need to do it anyway. I hope gator comes through with a 9.3 and it fits this mold, I really like this boolit design.

Jethunter, what type of sizer do you use?


Some makers, NEI comes to mind, that they were designed to use .357 checks!
-tj

[jethunter]

I did find an issue with my custom Lyman sizer, it is .367, not .368, but I don't think opening this up another .001 is going to solve my problem, but I need to do it anyway. I hope gator comes through with a 9.3 and it fits this mold, I really like this boolit design.

Jethunter, what type of sizer do you use?

RCBS lube-a-matic with custom .368" Lyman sizer die from Buffalo Arms that is closer to .367" in reality. The GCs are .375" aluminum from Sage Outdoors.

[LIMPINGJ]

tjones are the new NEI molds cut to use .357 checks? If so they have changed from the way Walt made them, his were made for .375 checks.

[Blammer]

does a 357 GC have enough outside dia to get sized properly?

[shooter93]

I seat the check first, I use one of Al's seaters, then I sneak the bullet in a 375-376 sizer die just enough to crimp the cheack but not touching the bands. then I size and lube to whatever size you want the bullet.

[toolz568]

It's working great. Thanks for the help. I modified a Lyman .363 sizing die and it works great. I opened the top to .380 to seat the gas check, then bored the middle out to .370 and finished the end at .380. I removed the pushout rod so the bullets would drop through. Basically I made a hour glass that is .370 in the middle and it sizes the gas checks and bullets to a perfect .368.

Though I planned this out, I have to say it was 90% luck that it works. We still need someone to make .366 gas checks.

[9.3X62AL]

I've had little grief using .375 Hornady GCs on the shank of my Mountain Molds .367" boolits. MM made me a sizer die @ .367", and it has a tapered leade and relieved push-pin that produces an even, convex aspect to the check's contour. These shoot very well to 1800 FPS, and now that I have a 2nd sizer filled with Lar's Carnauba Red I'm going to try stepping on the gas a bit. When run at 2000-2100 FPS, the Javelina NRA 50/50 kinda ran outta gas--leaving gray wash at the muzzle and progressively widening dispersion after 3-4 shots.

[PatMarlin]

What is the trick to resizing the .375 GC on .366 boolits? I'm destroying the boolit and GC and don't want to damage my Lyman lub and sizer.

Has anyone tried making a GC maker for this caliber besides Corbin?

Thanks for all the help, I made a die that works great, see thread #11.

Working on it now. Should have it specked out and will run some next week.

...:drinks:

Restructuring my operation and soon will have all calibers in stock pre-made ready for immediate sale and shipping.


...:Fire:

[tjones]

tjones are the new NEI molds cut to use .357 checks? If so they have changed from the way Walt made them, his were made for .375 checks.

It seems crazy but supposedly the 9.3 or .368" slug was designed to use a 357 check. That implies the unsized check is large enough to "fill the bore". The checks would seem to be necessarily thicker than the thin .010 copper or brass for 357 with a .340 shank.
Dish shaped Hornady checks would possibly work when sized to .368. Confused? I am too. tj

[Blammer]

I have some sample 9.3 GC's.
(about 100 or so)
They are a very snug fit for the 9.3's I have cast from NOE's mould for the GB.

If anyone is ordering GC's and would like me to include a sample to them I will. (may be about 5 or so GC's) You must let me know if they work and if you want any or not.

thanks

[toolz568]

Thanks Blammer,

PM on it's way.

[toolz568]

Ok, my .375 gas checks bulge then necks to the point they jam and will not load. I will try and make a custom neck sizer to fix this. The non gas checked boolits shoot great, but need to reduce the speed. Can'twait to try Blammers checks.

[PatMarlin]

Update for those who wish to make their own checks. And by the way, I'm a big fan of Gators and not trying to detract from their sales. Definitely a quality gas check.

I just finished my numbers and ran a set of Checkmaker™ dies on 9.3mm.

Here are the results:

Snap fit gas check (hard to pry off with your fingernail) with .014 Amerimax AL on Ammoheads's sample boolits-

.368 diameter as cast
.355 shank as cast

.383 overall diameter with gas check to be sized, so they should be rock solid.

[toolz568]

The gas checks came in from Blammer and I can't wait to try them, but I just scraped all the bullets I cast and I am going to recast them tonight and test them Saturday. The Boolits were very hard, in fact they were brittle. I going to mix up a new batch from pure lead and see what happen.

[acsteve]

I am interested in how the new 9.3 checks work out.

[Blammer]

he said they worked fine and ordered some from me. :)

I will have some in inventory soon, and you guys can order them.

If you want a sample of 10 or so, PM me.

[sav300]

My friend with a double rifle in 9.3x74r is upset cause the 375 checks bulge the necks and cannot be chambered.
So he need the 9.3 checks.
Will order when you have stock.
Thanks

[sav300]

Blammer,hi. Any 9.3 gas checks available?
Thanks for the research and work on these.

[Blammer]

Just got some.

only 5,000 in stock now, PM me for all those who want, I'll order some in for you. It's not something I'll want to stock a lot of.

sav300, if you have another order of other stuff going your way I'll send you a sample, let me know. I want to make sure they work for you before you order a bunch.

[sav300]

Hi Blammer,nothing ordered of late.May have to make a order as the owner of the 9.3x74r is chasing me for checks that fit, sheessss. Have a size die being made by Buckshot, so I will order checks very soon.