44 magnum boolits jumping crimp

[40-82]

I am looking for a 44 magnum load I can use in my 629-1 with a four inch barrel that won't jump the crimp. The bullet I am using is an RCBS 250 that weighs out with my alloy at 265 grains. The load I tried a few minutes ago was 15.4 grains of 2400. I tried two cylinders of this load using Winchester brass that had been fired several times, and after I fired the first five rounds, and I checked the remaining cartridge in the cylinder the crimp held. But when I loaded the cylinder with Starline brass the last round jumped the crimp. When I loaded the cylinder with IMI brass the last two cartridges jumped the cylinder so far that it tied up the gun. Both the Starline and the IMI brass has been loaded several times. All of the loads were seated to the same depth, and as far as I could tell by eye and feel the crimps were the same. I know 24 rounds is far from enough to create a valid sampling, but I wonder if this emerging pattern I am seeing that the Winchester brass performs properly and the other two don't is valid, and if it is does anybody know why.

[161]

I just finished up working this problem out with the help of several here. Check out this thread, should help you a bunch.
http://castboolits.gunloads.com/show...mag-sizing-die

[Petrol & Powder]

I shoot the same RCBS 250 gr. bullet out of a 4' 629 Mountain gun and have no problems. I seat to the crimping groove and apply a moderate crimp with a Redding Profile crimp die. A few things come to mind:
1. Not enough crimp
2. Expander plug is too large
3. spilt case mouth that you didn't catch
4. your load is hotter than you think (bad scale)

It's hard to diagnose via the intranet. Some pictures would help.
Also, I prefer to seat and crimp in separate operations. It's an extra step but I've always had good results.

[mdi]

I shoot a 629 w/6" barrel, with 265 gr. lead bullets and I too, use a Redding profile crimp, and have no problems. Having problems with one or two mfg. of brass would tell me that they probably have thinner case walls and thus a lighter crimp. I'd sort by headstamp and give those problem cases a bit heavier crimp...

[W.R.Buchanan]

We kind of need some pics of your loaded cartridges.

I have been shooting hotter loads than what you state for nearly 40 years with cast boolits and have never had a boolit jump crimp which leads me to think you are doing something wrong.

This can be a problem, especially with lighter guns that have dramatic recoil, however a good solid roll crimp in the crimping groove of the boolit generally keeps the boolit in place.

If you are experiencing this on your first loads thru this gun then something mechanical is wrong with the ammunition.

We need some decent pics of your loaded cartridges so we can see what they look like. Without pics we can't definitively say anything that matters.

Randy

[40-82]

I tried another six rounds. This time with brand new Starline brass. I used an RCBS tungsten carbide sizer, an expander out of a Redding 44-40 die set, a bullet seater out of an RCBS 4 die set, and then to do the crimp I changed from the RCBS crimping die to a Lee Profile Crimp. I don't have the Redding Profile Crimp die. I used the same 15.4 grains of 2400 and the RCBS cast 265 grain sized to .430. After firing the first five, I checked the crimp on the sixth cartridge. It had barely moved forward past the original crimp, not enough to tie up the cylinder, but this shouldn't happen.

I think I have my charge weight correct because I often check the scales against items of known weight, and I dropped the powder charges with an RCBS Little Dandy, which ought to be reasonably close anyway. According to my measurements it was dead on.

161,

I did read the thread you recommended, and it was interesting, but I haven't yet figured out my problem. Part of my problem might be a heavy bullet in a light gun, but I hope the only solution is not to make the choice between accepting some crimp jump or dropping to a 44 Special level load.

I'm not set up right now to do pictures, but to my eye the cases that jump the crimp look about the same as the ones that don't. I've switched back and forth between Hornady, RCBS, and Redding dies, and I haven't yet come up with the right combination.

[40-82]

I hope I successfully attached a picture of my 44 magnum reloads

[Tatume]

There's nothing wrong with your charge of 2400, as it is well below max at the Alliant site, where they do list the 250 grain RCBS Keith bullet.

http://www.alliantpowder.com/

I'm curious about

an expander out of a Redding 44-40 die set

Although the 44-40 uses a nominally smaller bullet, the outside diameter of the case is also substantially smaller, due to much thinner case walls. It would not be my choice to use this die, but I can't say it would cause problems either.

My first recommendation would be to use an expander/belling die made for the 44 Rem Mag.
My second recommendation is to use a good roll crimp die, and I would start with the RCBS bullet seater. After your bullets are seated, back off the bullet seater stem, then screw the die body down until you can apply a firm crimp. It should not be so much that the case is deformed, but just enough that the case mouth is rolled into the bottom of the crimp groove on the bullet. If the RCBS crimp solves your problem, and you don't want to readjust your dies frequently, just buy another.

I've been loading 44 Rem Mag for 4" through 7-1/2" revolvers for many years, with maximum loads and much heavier bullets than yours, and I don't have this problem. I also use mixed brass, and I use them until the mouths split, and still, no bullet creep. I think your problem lies with your dies.

Take care, Tom

[Petrol & Powder]

OK the picture helps. The cartridge on the left looks like the bullet could stand to be seated just a hair deeper. The top of the casing should be right at the bottom of the front driving band before the crimp is started. It also looks like you could put a little more crimp on those rounds so that the casing "rolls" into that crimp groove and follows the angled contour of the lower portion of the crimping groove in the bullet.

[40-82]

Tatume,

I used the Redding 44-40 expander, hoping the smaller expander might help when the expanders that came with the 44 magnum die sets did not help. I don't know that my problem is with the expander, but I have tried the expanders that came with an RCBS 44 magnum die set, another from a Redding 44 magnum die set, and another from a Hornady die set. Other than that I am doing something fundamentally wrong I don't know what it is. I'd like to guess that the problem is with the dies, but since I have three sets of dies from good makers with a Lee profile crimp thrown in, my best intuition suggests that the problem is an error in technique.

[mdi]

Never heard of a Lee Profile Crimp die. Are you talking about a Lee Factory Crimp Die? That may be the problem; swaging the case/bullet after seating. FWIW, try pushing the seated bullet against the bench to see how tight the expander leaves the case. Also measure the id of the case after the expander. I've never had a problem with .44 Magnum expanders in either of the two die sets I have (RCBS and Lee) nor my Lee Loader. I kinda think the problem is from your crimp, as I've not experienced your bullet jump problem in 25+ years of reloading the .44 Magnum...

[gray wolf]

Are you using a soft alloy ?, also I think you are using an expander meant for jacketed bullets, that can squeeze down a bullet
and the LFCD can compound the problem. When your all done with the round can you see the outline of he bullet in the case ? Measure the expander,
and what size are your bullets ? Load a dummy and pull it and check the size. Note how much force it takes to pull the bullet, it shouldn't come out with one whack.

I shoot a 260 gran GC bullet with 19 grains of 2400 in my SRH with a moderate crimp and it doesn't move.

[C. Latch]

If I'm seeing and understanding your pictures correctly, I'd say your crimp is insufficient.

[AlaskanGuy]

I crimp mine with the standard rcbs crimp that came with the die set... Crimping either the Keith or the much bigger 310 lee or 340 gr lyman. I tighten the crimp die down pretty good to really put a good, curved crimp on the boolits....



Also, i try to crimp so that the crimp seats right on the top of the crimp grove, to give maximum amount of distance for the crimp to form, so to speak.... Sorry about the cruddy pic. But you should be able to see the curve of the crimp, and how it fits right at the very top of the crimp groove...

Hope this helps,

AG

[1bluehorse]

I crimp mine with the standard rcbs crimp that came with the die set... Crimping either the Keith or the much bigger 310 lee or 340 gr lyman. I tighten the crimp die down pretty good to really put a good, curved crimp on the boolits....



Also, i try to crimp so that the crimp seats right on the top of the crimp grove, to give maximum amount of distance for the crimp to form, so to speak.... Sorry about the cruddy pic. But you should be able to see the curve of the crimp, and how it fits right at the very top of the crimp groove...

Hope this helps,

AG

It may be just the picture, but it appears to me you are applying TO MUCH crimp, hence getting a bit of bulge at the top of the case (just below the crimp) and losing case neck tension...I'm like the others in the fact that I haven't had any issues with bullet jump in my 44's and I load a bit more 2400 than you are.....also I seat and crimp at the same time with my RCBS or Hornady dies with about 3/4 turn of the seater die after case mouth contact, just enough I can run my fingernail down the side and not catch the case mouth.....case neck tension is the key, not crimp.....to much crimp not good...

[AlaskanGuy]

It is the pic... There is no bulge, except in the lens of this silly Ipad...lol

[NYBushBro]

I crimp mine with the standard rcbs crimp that came with the die set... Crimping either the Keith or the much bigger 310 lee or 340 gr lyman. I tighten the crimp die down pretty good to really put a good, curved crimp on the boolits....



Also, i try to crimp so that the crimp seats right on the top of the crimp grove, to give maximum amount of distance for the crimp to form, so to speak.... Sorry about the cruddy pic. But you should be able to see the curve of the crimp, and how it fits right at the very top of the crimp groove...

Hope this helps,

AG

What bullet is in this photo??? Looks nice.

[Tar Heel]

Or this..

Attachment 104349

[Tar Heel]

Seat and crimp in separate steps if possible. Your crimp is too light. It should look more like this.

Attachment 104350

[rondog]

Or this..

Attachment 104349

Now you're talkin'!