Mauser 7,65 Arg.

[nueces5]

Hello everyone, today I was finally able to get a decent group at 150 meters with the Mauser 7.65. Approximately 1.5 or 2 moa. I did not have an opportunity to measure the speed. The charges were made with H2400 15, 16.5 and 18 Grains. Brass FN Berdan. RWS primer. Practically the groups were the same. I tell you that I also did a barrel slug and bought me a micrometer. It gave me .312 in its widest part. Currently I have a mold Lee .312 with a .311 Lee bullet sizing kit.
Should I improve the grouping if I leave the tips as they come out of the mold?
I was thinking of taking a specialist bullet sizing kit to enlarge it to .312 or .313. And so I can put the gas checks
Is it a good idea or a crazy idea?

[Texas by God]

Sounds like a good idea. Your groups indicate good things.

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[Der Gebirgsjager]

That's a really hard question to answer. Rifles can be such "individuals". Like TbG said, it's looking good.
.002 - .003 over diameter in the cast boolit world is usually good, but I don't know if I'd permanently alter a mold to find out, when the results are like what you've got. Maybe someone casts them a bit larger and could send you a few to try out. The "beagle" system might work for you.

[Hick]

My Argentine Mauser (7.65) slugs at 0.312 and seems to do well with the Lyman 314299, sized to 0.313. To be fair, I haven't gotten into ladder load testing yet, so I don't have good data on best group size with mine. I'll be very happy if I can get mine down to what you are seeing.

[nueces5]

I promise photos of what I tell them, I am very happy to achieve this to the second batch of reloads

[Wayne Smith]

PS - you can't enlarge by sizing. Size down, swage up. If you are increasing the diameter of the boolit you are swaging it up, a vastly different process than sizing it down. We have an entire section dedicated to swaging.

[Thumbcocker]

I would size to .314. If you have the ability to determine the throat diameter of your rifle size to that diameter or just under. Lyman 314299 or similar design from NOE or another good maker would be my recommendation for a first try.

[Dan Cash]

You could size to .306 and paper patch to .314. I bet you would have a very accurate result.

[nueces5]

PS - you can't enlarge by sizing. Size down, swage up. If you are increasing the diameter of the boolit you are swaging it up, a vastly different process than sizing it down. We have an entire section dedicated to swaging.

I know, I think my explanation was misunderstood, I thought I would take the sizing from .311 to .312

I would size to .314. If you have the ability to determine the throat diameter of your rifle size to that diameter or just under. Lyman 314299 or similar design from NOE or another good maker would be my recommendation for a first try.

I need a new mold, Lyman is 200 grains, is a good weight for the twist rate of 1909

You could size to .306 and paper patch to .314. I bet you would have a very accurate result.

paper patch is something I want to try, I did not know that I had to size first in .306

[Kraschenbirn]

The barrel of my '09 Argie carbine slugs right at .312 and I size PC'd Lee 312-155s to .314 using an NOE push-thru (best cast-boolit tool I ever invested in!). 18.5 gr 2400 or 26.0 gr. 4198 produce consistent 2 MOA @ 100 yds with issue sights.

Bill

[Buckshot]

...............I have a few Argentine Rifles AKA FAT 30's. Ideally they are about .311 - .313" or so. Those over that and you're wanting a .314" to .316" slug. There are a few moulds out there that can handle the groove diameter. If you can "Fill the Groove" the slug will follow.

I have a couple "Fat 30's" that are Argentine's and Russians. You want to 'Fill the Groove', and if you do, the lead displaced by the lands will ideally seal the barrel. Remember, if the pressure of the propellant gasses can get past the slug, they will cut the lead slug to pieces. If you can SEAL the barrel to seal the gas pressure, the lead slug will spin due to the lands. The barrel is the same from beginning to end. The bore (lands) is what imparts the spin and displaces lead to fill the barrel.

The limitation is that if the load is too powerfull, and the bullet is too soft, It can strip in the lands, and if so all accuracy is null and void. Normally, the load is balanced against the hardness of the alloy, so that it does not strip in the barrel.

If a boolit dropped from the mould can be seated in the casemouth, then that is what I'd use. The lead alloy is easily displaced by the steel of the barrel lands. Since that is so, you want the fattest slug that will be seated and chambered. Ideally it will seal the barrel. If the boolit seals the barrel, no gas can make it past. The alloy simply has to be strong enough to stand the spin of the lands.

..............Buckshot

[nueces5]

The barrel of my '09 Argie carbine slugs right at .312 and I size PC'd Lee 312-155s to .314 using an NOE push-thru (best cast-boolit tool I ever invested in!). 18.5 gr 2400 or 26.0 gr. 4198 produce consistent 2 MOA @ 100 yds with issue sights.

Bill

Kraschenbirn, a question, you cast boolit of .312 in diameter and with a tool you expand it to .314?

[nueces5]

...............I have a few Argentine Rifles AKA FAT 30's. Ideally they are about .311 - .313" or so. Those over that and you're wanting a .314" to .316" slug. There are a few moulds out there that can handle the groove diameter. If you can "Fill the Groove" the slug will follow.

I have a couple "Fat 30's" that are Argentine's and Russians. You want to 'Fill the Groove', and if you do, the lead displaced by the lands will ideally seal the barrel. Remember, if the pressure of the propellant gasses can get past the slug, they will cut the lead slug to pieces. If you can SEAL the barrel to seal the gas pressure, the lead slug will spin due to the lands. The barrel is the same from beginning to end. The bore (lands) is what imparts the spin and displaces lead to fill the barrel.

The limitation is that if the load is too powerfull, and the bullet is too soft, It can strip in the lands, and if so all accuracy is null and void. Normally, the load is balanced against the hardness of the alloy, so that it does not strip in the barrel.

If a boolit dropped from the mould can be seated in the casemouth, then that is what I'd use. The lead alloy is easily displaced by the steel of the barrel lands. Since that is so, you want the fattest slug that will be seated and chambered. Ideally it will seal the barrel. If the boolit seals the barrel, no gas can make it past. The alloy simply has to be strong enough to stand the spin of the lands.

..............Buckshot

very good explanation, thanks

[Kraschenbirn]

Kraschenbirn, a question, you cast boolit of .312 in diameter and with a tool you expand it to .314?

Nope...that particular Lee mold drops just a bit over .313 from my homemade Lyman #2 alloy. I seat/crimp GCs on unsized boolits then powder-coat. PC adds .0015-.0025 to boolit dia. and, from there, I size back to .314. I use the same procedure with a Lee 312-185 to feed a No1MkIV and a couple of Moisins.

Bill

[WRideout]

I haven't shot cast in an Argentine '09, but when I had one, I used .313 diameter jacketed with good success. I made cases from cut down 30-06, but I think they are available new from Grafs, maybe another vendor too.

Wayne

[nueces5]

Hello everyone, although with the boolits just beginning and still needs a lot to reach some precision, today I was surprised that a recipe that I made with Argentine powder was the best medium result
I shot with 16 and 18.5 Gr of H2400, with 24 and 25 Gr of an Argentine powder that is very similar to 3031.
With 24 Gr it was not a good result, but to my surprise with 25 Grains I had this result, so at least I have something to work on.

The shots were made at 150 meters, the X shows where I pointed

[cwlongshot]

I have been makin Brass for mine... (I have a 1909 and a 1889)

Loading with a Lyman 313 mold. I also like bigger lead slugs as a rule.

One way to bump up dia also might be powder coating.

CW

[Adam20]

...............I have a few Argentine Rifles AKA FAT 30's. Ideally they are about .311 - .313" or so. Those over that and you're wanting a .314" to .316" slug. There are a few moulds out there that can handle the groove diameter. If you can "Fill the Groove" the slug will follow.

I have a couple "Fat 30's" that are Argentine's and Russians. You want to 'Fill the Groove', and if you do, the lead displaced by the lands will ideally seal the barrel. Remember, if the pressure of the propellant gasses can get past the slug, they will cut the lead slug to pieces. If you can SEAL the barrel to seal the gas pressure, the lead slug will spin due to the lands. The barrel is the same from beginning to end. The bore (lands) is what imparts the spin and displaces lead to fill the barrel.

The limitation is that if the load is too powerfull, and the bullet is too soft, It can strip in the lands, and if so all accuracy is null and void. Normally, the load is balanced against the hardness of the alloy, so that it does not strip in the barrel.

If a boolit dropped from the mould can be seated in the casemouth, then that is what I'd use. The lead alloy is easily displaced by the steel of the barrel lands. Since that is so, you want the fattest slug that will be seated and chambered. Ideally it will seal the barrel. If the boolit seals the barrel, no gas can make it past. The alloy simply has to be strong enough to stand the spin of the lands.

..............Buckshot

This is the best explanation I have seen worded for people to understand. Can it be put into a sticky

[franciscom]

Hello everyone, although with the boolits just beginning and still needs a lot to reach some precision, today I was surprised that a recipe that I made with Argentine powder was the best medium result
I shot with 16 and 18.5 Gr of H2400, with 24 and 25 Gr of an Argentine powder that is very similar to 3031.
With 24 Gr it was not a good result, but to my surprise with 25 Grains I had this result, so at least I have something to work on.

The shots were made at 150 meters, the X shows where I pointed

Hey Doc ( nueces5), I am taking my first steps loading for the 7,65 Argentino. I have read some comments about loading 24gr of A27 behind a 185gr boolit. I would like to use this same recipe myself, but I am a little bit concerned about it being to low of a charge. I am affraid of experiencing a kaboom due to a squib. I would like to ask you what weight if boolit are you loading with and if you are using gas checsk or powder coating your boolits and also what kind of lead alloy are you using.
Regards
Franciscom


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[nueces5]

Hello Francisco, are you Argentine?
Yes, that load use it with 25 Grains of A27, boolit of 185 grains half and half linotype and lead of pipe, with added of 1% of tin.
Simple lube and a bit of cotton between the powder and the boolit
I go to the club of lomas de zamora