Loads for Heavier bullets in a 45/70 conversion

[michiganmuzzy]

N530 does look pretty good as well as the 10x and maybe aa2015.

 

[GM54-120]

Few more with 350gr and compressed loads.....H322 might work too.
https://shootersreference.com/reloadingdata/450-marlin/

 

[michiganmuzzy]

I just received 2lbs of n120 from MidwayUSA. Im going to try to track down a few of the others listed and hopefully can try out at least a couple loads before Christmas.

 

[xdmalder]

H322 is a hard one to find. If you have a Scheels up there they have been carrying the Vihtavuori powders there lately

 

[michiganmuzzy]

H322 is a hard one to find. If you have a Scheels up there they have been carrying the Vihtavuori powders there lately

Closest Scheels is several hundred miles at least. But theres a LGS that may have it. Im going to 3 that stock some powders and see what i can find.

 

[xdmalder]

Hopefully not as cold over there as it is here today for you. Minus 60 windchill for us

 

[michiganmuzzy]

Hopefully not as cold over there as it is here today for you. Minus 60 windchill for us

Still at 34f right now. Its not supposed to get cold til tomorrow. But not that cold, afaik.

 

[GM54-120]

Benchmark also...it has close to the same speed as H322 but much less peak. Both loads compressed at 58-59gr.

This is assuming a 350gr is about what you wanna shoot.

 

[GM54-120]

Some of these powders you might find in 458Win mag with lighter bullets but probably not full case loads and the 458Win is rated for much higher pressures too. 450Marlin is just about right but more case volume would make guesstimates easier.

Most guys using powders slower than 4198 are more into the 300-325gr boomer loads and it takes a fair mount of powder to get there.

 

[GM54-120]

They do have some 458 data too. Just checked.
https://shootersreference.com/reloadingdata/458-winchester-magnum/

 

[xdmalder]

Varget will get up there as well but the slower the powder the more inefficient it gets. Thus more powder to get equal velocity at a lower pressure. So since recoil has a 1.5 multiple with powder weight, recoil increases exponentially. That's the trade off.

 

[GM54-120]

But if you want to shoot heavier bullets a bit slower and less peak than 4198 ......its possible. A 350gr might be enough?

 

[michiganmuzzy]

Seems like a some of the powders that would be good with a heavy weight bullet are also popular with the guys reloading small cal light bullets?
When i get a new mold made for a 45-340i with a gas check i going to be shooting those smokeless.

 

[Patrick McChristy]

I forgot I have some cast 330s with gas checks - are you shooting these sabotless?

 

[GM54-120]

You might be able to shoot "hard cast" speed with low amounts of 5744. Doc did it. The load he mentioned was quite a bit less than MLII 5744 data. Sure seems like a 1500-1600fps hard cast load would be possible.

Hodgdons reloading shows about 35gr 5744 gets a 350gr moving around 1630fps. Since it does not state full case you could use a wool wad or two to create some air space????

458SOCOM data to reduce the case capacity.
https://hodgdonreloading.com/reloading-data-center

 

[michiganmuzzy]

I forgot I have some cast 330s with gas checks - are you shooting these sabotless?

Yes thats my plan

 

[bronko220002]

Noot much experience yet in heavy bullets out of a smokeless ml but I shoot 500 cast conicals out of my 1874 Pedersoli Sharps with great accuracy.
I will soon be trying .501" 440gr bullets out of one of my Rem 700MLs

 

[Mnt monkey]

Sr 4759 is pretty versatile, I'm going to try it with some heavy bullets once I get settled in a little bit more , I know that they don't make it anymore but I run into it from time to time if you find any, a few months back when I was shooting the 400 grain Fury bullets,I started with 36 gr imr 4198 worked my way up to 46 grains and stopped there now that was with a full shank number 17 barrel also on a begara Remington clone action, I did not get a really nice group until around 44 and 45 grains the light loads did shoot okay inch and a quarter but if I remember correctly 46 grains shot very well. I think sr4759 if you can find any would be very interesting again I'm going to find out. Michigan muzzy if I were you I would consider building a second rifle or getting a second barrel with a heavier barrel shank and do your load work up with that rifle- barrel and then drop your charge a little bit for the break action, I'm interested in heavy bullets and smokeless also but I want to continue to approach it very cautiously. It seems to me if you're shooting heavy lead you're not going to have to shoot as hot a load as I am with the jacketed bullets I'm shooting to get your bullet to swell properly,,, interesting stuff I think!!

 

[Mnt monkey]

And you are right to notice most of the powders that are used for 6br 6ppc Etc are worth taking a look at for these heavy bullet projects

 

[Mnt monkey]

I have a couple of 18 twist barrels, and a 16 on the way hopefully the next couple of years we can work up some heavy bullet loads I know one thing the bullets that Dennis made, the prototypes and also Northern precisions look beautiful I'm excited about both of them