I recall some useing N-133 Vit. powder in some of the larger bores, wonder where max loads were so I could cut 10% and work up to max in my 45-70 and 348..I liked the fact the poster got top velocity and less pressure...

There is pressure tested load data for that powder in the 45/70 on the Vihtavouri website.

https://www.vihtavuori.com/rel...oading/?cartridge=57

The max pressure quoted is 210mPa which is 30.4 kPsi.

Note that they say the data is only for use in strong actions like Ruger No.1 or Mauser bolt actions.

Neither of those cartridges lend themselves to working up loads based on pressure signs. By the time you see pressure signs, it's too late for many of the rifles made for them.
For a Ruger or Siamese Mauser; you can.
For trapdoors and Marlins, you can't.

Thank you JFE and DPCD.
Ray,
I use N133 because it provides a significant buffer to high peak chamber pressure and is accurate in my rifles.

If I were loading for max velocity from 45-70 I might go with RL7 or 2230. N133 has also been able to drive very effective bullets to velocities above the max loads in some manuals --- that is a killing velocity in my .405 WCF and 45-90 (ele, many buff, leopard, etc.).
Therefore I see no reason to load for higher velocities. My hunting ammo is for hitting and killing game, not winning "go-faster" contests with other shooters.

I shot my first "warm" 45-90 load in my 45-90 DR this weekend (Dang that felt good)and I feel very confident that it will handle most any thing I will hunt this side of Africa.

Does no one use IMR 3031 anymore? Stuff always worked and still works for me.

I know I am a dinosaur.

quote:

Originally posted by Michael Robinson:
Does no one use IMR 3031 anymore? Stuff always worked and still works for me.

I know I am a dinosaur.

Good point. I like H4895. Many ways to skin a cat. These days folks sometimes have to make due with what they can find.

3031 & N133 I think are pretty close in burning rates,I use 3031 in most of my levers.

Im good with N133 in my 45-70, I need load data with it in the 348..Im presently using RL-19 and 17...

I would have thought 133 is too fast for the 348. I’ve used 4831 and 4350 in the 348.

quote:

Originally posted by ColoradoMatt:
I would have thought 133 is too fast for the 348. I’ve used 4831 and 4350 in the 348.

Good choices for powder,I am having good luck with Norma MRP in my 348 ackley improved,250's going 2400 fps with an easy lever.

MR,
On 3031, yes it is still alive and shooting.

The Load Data site has Express Loads for the 45-90 and they are with 3031.
Since there were good loads for 350 grain bullets, I calculated equivalent loads foe N133 to use in my 45-90 rifles. Their max charge of 69.5 grains of 3031translated to 67 grains of N133 and I loaded some 350 SS at 60,65, and 67 grains of n133.
The 60 grain loads are very accurate in my DR and feel and sound fast, but have noy fired them over my Chrony yet.
Hope to use that rifle on a cull hunt next weekend and how it treats game.

Ive used most of the older powders, but I like to play with some of the new powders, especially those that meter better than 4831 and 4350 for instance, H414, RL-17 and Rl-19 has pretty much replaced the old slower powder in many calibers..

Im having great luck with N-133 in the 45-70 getting same velocities with pressures in the 26000 to 29000 PSI range, Im not into 2400 etc FPS in my 45-70, more like 1900 fps to as much as 2000 in one cases, and very mild pressure it seems..Had my best results with 350 gr. swifts and 400 gr. Remingtons..The 300 gr. Hornadys are nice, but they seem to defeat the purpose of the 45-70 IMO, much the same as the 200 gr. Hornadys defeat the 348s purpose, I can use the 30-06 to better the 348 in that case..

I would appreciate how it would work in the .348 by actual experience..

CR, thanks for that contribution..it worked out the same for me in one gun, the other gun has an issue in the neck, but will work that out..

When push comes to shove in these big of Winchesters and marlins, my hunting loads are with IMR-4198..the rest I play with, but RL-19 wins in the 348 so far on a hunting loads as to velocity and accuracy.

well I ran the gauntle for .348 Win powders and my personal favorite for most any load it RL-17 and Rl-19, and I lean heavy to the RL-17 with the gun I have, but in another 348 not belonging to me RL-19 proved more accurate and not much different in velocity..N-133 didn't do much for me except in my 45-70 Marlin, that I ended up selling, thats where N-133 shined..

quote:

Originally posted by Michael Robinson:
Does no one use IMR 3031 anymore? Stuff always worked and still works for me.

I know I am a dinosaur.

i use 3031 a lot!
458 win mag
358 win
300 savage
35 rem

3031, 4350, 4831, 4064, and most of the old powder still work great, and as well as the new stuff, BUT
The cut grains from the Powder Measure and one needs to weigh each charge..I find the RL powders, H414 WW760 (the same) and others, if you in touch with your powder measure will toss perfect charges and speed up the process.Ive tested this for years and the secret of the powder measure is consistency of hand move ment from one toss to the next..Try it with 100 cases and weigh them all, and see if you have the touch, if not work on it, however you probably will never see this in print again. Ive won a lot of money gambling on this..I weigh a charge every now and then but its always spot on within a gr or better..It beats a "scoop" all to hell..