Has anyone tried this powder? Particularly with 45-70?

[Bigscot]

IMR7383 This is a slow burning stick powder originally used for the Cal. .50
M48A2 Spotter/Tracer round. This is not the same case as that known as
the .50 Browning Machine Gun cartridge. This powder is NOT recommended
for the .50 BMG round. It is a very bulky, single-based powder, composed
of 85% nitrocellulose and 15% stabilizers, flash inhibitors and graphite;
that was developed to replace the IMR4831 powder that was being used.
It has about the same propellant energy as IMR4831 when compared in equal
volume. IMR4831 data can be used. Begin with starting loads, reduced 15%
by weight.

Bigscot

[frnkeore]

Since it seems to be a IMR 4831 clone, I have some duplex loads using 4831 but, they are for strong rifles and have recoil that also goes with them.

Frank

[rr2241tx]

As it appears to be similar to IMR-4831, it would appear to be too slow to be of much use in a straight case rifle round like .45-70.

[swheeler]

IMR7383 This is a slow burning stick powder originally used for the Cal. .50
M48A2 Spotter/Tracer round. This is not the same case as that known as
the .50 Browning Machine Gun cartridge. This powder is NOT recommended
for the .50 BMG round. It is a very bulky, single-based powder, composed
of 85% nitrocellulose and 15% stabilizers, flash inhibitors and graphite;
that was developed to replace the IMR4831 powder that was being used.
It has about the same propellant energy as IMR4831 when compared in equal
volume. IMR4831 data can be used. Begin with starting loads, reduced 15%
by weight.

Bigscot

I think a triple base powder, do a search and you will find data, think Flyod Jim used it in 45-70

[Maven]

Bs, Take a look at this: http://www.google.com/cse?cx=0019512...383&gsc.page=1

[BCB]

My lot # is RAD78L 47985...

My container indicated to start with IMR-4064 data--that is a bit faster than the 4831's...

Might want to research the burning rate of it a bit closer...

Just my thoughts...

I really never had good luck with it in the few cartridges I tried it in...

Good-luck...BCB

[Bigscot]

It sounds like this might not be a good powder for 45-70. I just got my first 45-70 and am looking for powders to use. Is there as surplus powder which will work in 45-70?

Bigscot

[Nobade]

I use heaps of 7383 in many different rifles. It works just fine in the 45-70, the heavier the boolit the better. Can't get enough of it in there to hurt any modern rifle, I use a drop tube and compress it hard and it burns reasonably well.

All the available surplus powders, except blank powder, can be made to work in the 45-70. I use a lot of WC860 in my C.Sharps 1875, duplex loaded and pushing a paper patched boolit. Incredible accuracy and easy to deal with. But you have to duplex load it (I use 5gr. IMR4227) or it is way too slow to do much but get the boolit out of the barrel. BTW, don't ever duplex IMR7383.

-Nobade

[frnkeore]

What is it about 7383 that makes it so different from IMR4831 as to be dangerous in duplex loads?

My own duplex load of 4831 is very accurate and has excellent chronograph results.

430 gr bullet, cast in 20/1 alloy

1473 fps ave.

10 fps ES

4 fps SD

5 shot 100 yard group of .60

Though the load doesn't sound like it's has a lot of recoil, in match shooting (45 - 60 rounds), it wears on you, even in a 15 lb rifle

All the above info shows a very stabile and safe load. I developed it to obtain a higher loading dencity in the 45/70.

This load is shot breech seated but can be adjusted (reduced) to fixed ammo with less accuracy.

Frank

[swheeler]

]What is it about 7383 that makes it so different from IMR4831 as to be dangerous in duplex loads? [/COLOR]

My own duplex load of 4831 is very accurate and has excellent chronograph results.




430 gr bullet, cast in 20/1 alloy

1473 fps ave.

10 fps ES

4 fps SD

5 shot 100 yard group of .60

Though the load doesn't sound like it's has a lot of recoil, in match shooting (45 - 60 rounds), it wears on you, even in a 15 lb rifle

All the above info shows a very stabile and safe load. I developed it to obtain a higher loading dencity in the 45/70.

This load is shot breech seated but can be adjusted (reduced) to fixed ammo with less accuracy.

Frank

Triple base progressive burning powder that burns at about red dot speed once it reaches about 40K psi, putting a kicker under it could get exciting real fast.

[Nobade]

What is it about 7383 that makes it so different from IMR4831 as to be dangerous in duplex loads?

My own duplex load of 4831 is very accurate and has excellent chronograph results.

430 gr bullet, cast in 20/1 alloy

1473 fps ave.

10 fps ES

4 fps SD

5 shot 100 yard group of .60

Though the load doesn't sound like it's has a lot of recoil, in match shooting (45 - 60 rounds), it wears on you, even in a 15 lb rifle

All the above info shows a very stabile and safe load. I developed it to obtain a higher loading dencity in the 45/70.

This load is shot breech seated but can be adjusted (reduced) to fixed ammo with less accuracy.

Frank

Frank,
7383 is a triple base powder, and contains nitroguanadine. In addition to smelling awful when it burns, it is extremely peaky when pressures get too high. I have had several guns nearly self destruct by firing loads in the summer that were perfectly safe in the winter. I personally would not want to try to induce that behavior intentionally by duplex loading it. It may be OK sometimes, but I feel this powder is too touchy to want to try it myself.

-Nobade

[frnkeore]

OK, thank you both.

Frank

[bobthenailer]

Never used 7383 ! but 4831 was the most accurate smokeless powder out of perhaps 7 others tried in my Browning BPCR in 45/70 , with 50.0 grs & a Saeco #020 540 gr fn boolet @1,280 fps MOA @200 yards for a 25 shot group, using a 6.5X20 Leupold target model scope for sighting