Marlin Firearms Forum banner
1 - 18 of 18 Posts

·
Registered
Joined
·
1,611 Posts
Discussion Starter · #1 ·
Hi all my gunsmith has just finished the woodwork on my 47-70 Cowboy. It has been a struggle to find reloading components this side of the pond but it has finally come together. my range manager found 40 rounds of Sellier & Bellot 405 gr sp ammo (1510 fps) which I intend to keep to one side. I have however acquired from many sources. 300 405 gr hard cast pre-lubed bullets 100 cases and a pound of Reloader 7 powder. All components are in short supply so it's a case of going with what you have got as many powders cannot now be imported into the UK.

This will NOT be as hunting load. from what I have read mv is best kept at or under 1600fps, I have checked all my reloading data and come up with a load of 40grs of R7. Now before I do anything I thought I would appeal to you guys for advise and opinions. I have other powders that are no longer available in the UK but these are put aside for existing loads in other calibers. My smith has found 2 more lbs of R7 so that is what we have. The rifle is a 45-70 cowboy with a 26" tube. By looking hard my gunsmiths and I have found 3 Cowboys 357/ 20" 44m/24" & 45-70 26" I am more than please as all are JM's, I have loads for the other 2, Gar.
 

·
Registered
Joined
·
702 Posts
RL7 is great with the 45/70. I use a trapdoor level charge of IMR 4198 with my 405s for an easy on the shoulder and just plain fun pumpkin chucking round. As a reference, the Lyman 49th has the trapdoor range at 37.0-40.0 grains for RL7 for a 405 gr cast. Lists 1,534 to 1,578 FPS. I would guess 40.0 will probably be around 1,600 in your rifle with the 24” barrel. If you can get the Lee liquid alox, I found that does help with leading, but even better is keeping the cast bullets at their appropriate speed, obviously dependent on the BHN of your bullets. Good luck! Let us know the results.
 

·
Premium Member
Joined
·
2,365 Posts
1. Did your gunsmith slug the barrel on your cowboy? 2. Are the cast boolits 2 thousands bigger? 3. Do the boolits have gas checks? If it’s yes to these questions you can run them faster. If they aren’t gas checked you will have to run them slower. Reloaders 7 is my go to powder for jacketed bullets in the 45-70 and should work with lead boolits. Good luck an keep us posted.
 

·
Premium Member
Joined
·
888 Posts
Since the OP will not be hunting with his rifle, speeds above ca. 1300 fps really aren’t needed unless he anticipates long range shooting. The lower velocity will also be easier on the shoulder - especially with that hard curved buttplate in the cowboys - and his cans of powder will last longer. 33.0 to 35.0 grains of RL-7 should be plenty….although everyone who owns a .45-70 owes it to themselves to shoot at least a few high power loads.
 

·
Registered
Joined
·
205 Posts
Hi
I am in the UK 🇬🇧 too, south coast.

I use 34gr of RL7 with a hard cast 405gr bullet from Shellhouse.
This I shoot in my 1894SBL and very accurate at 50meters.
I then use 40gr with a 300gr JHP speer bullet.
 
  • Like
Reactions: Gareth Holland

·
Registered
Joined
·
2,594 Posts
Hi all my gunsmith has just finished the woodwork on my 47-70 Cowboy. It has been a struggle to find reloading components this side of the pond but it has finally come together. my range manager found 40 rounds of Sellier & Bellot 405 gr sp ammo (1510 fps) which I intend to keep to one side. I have however acquired from many sources. 300 405 gr hard cast pre-lubed bullets 100 cases and a pound of Reloader 7 powder. All components are in short supply so it's a case of going with what you have got as many powders cannot now be imported into the UK.

This will NOT be as hunting load. from what I have read mv is best kept at or under 1600fps, I have checked all my reloading data and come up with a load of 40grs of R7. Now before I do anything I thought I would appeal to you guys for advise and opinions. I have other powders that are no longer available in the UK but these are put aside for existing loads in other calibers. My smith has found 2 more lbs of R7 so that is what we have. The rifle is a 45-70 cowboy with a 26" tube. By looking hard my gunsmiths and I have found 3 Cowboys 357/ 20" 44m/24" & 45-70 26" I am more than please as all are JM's, I have loads for the other 2, Gar.
Gar,

Good powder choice in times where components are like finding chicken lips. What I have on hand for a 1,500-1,700 fps range is 4198. However, Rel#7 and 4198 are close on the burn range chart and Rel#7 should perform equally as well.

The Lyman 4th edition cast manual has two option.

Trapdoor loads with Rel#7

BulletMinFPSCUPMaxFPSCUP
330 gr40.01,63314,60042.01,71116,600
405 gr37.01,53416,40039.01,57817,900

Lever Action loads with Rel#7

PowderMinFPSCUPMaxFPSCUP
330 gr49.01,85316,70055.02,09625,100
405 grnot listed
 

·
Registered
Joined
·
337 Posts
I don’t have any R7 but if you come across any of these powders, here is some info.

My Cowboy likes 459 diameter bullets and LOVES 460 bullets.

13 grains of Red Dot with 405 gr and no filler = 1209 fps.

30 grains of 5744 with 425 grain cast = 1435 fps.

14 grains Unique no filler with 425 grain = 1170 fps.
 

·
Registered
Joined
·
1,611 Posts
Discussion Starter · #13 ·
OK bullets measure .4570 & 4575 2 lots they are hard cast and have 3 lube grooves prefilled with lube. My smith grabbed the last 2 lbs of R7 in the country, ready for this NO primers anywhere ? I have plenty. With the cast bullets I am lucky to have 300 of what I have, Now would you guys add any more lube ?
I have removed to Lyman globe target front site not enough lite on the 100m underground range, and fitted a 1/16 x .500 white fore site bead to see if this will show up better. Will get some loaded this week I have 100 cases 50 new 50 once fired they are now resized and in the tumbler, NO 45-70 brass in the country, Brownells no back order but will email if they get any.
Please keep the info coming as it is greatly appreciated. No time to thinks about getting into casting as it will soon be pheasant time again, Gar.
 

·
Registered
Joined
·
1,297 Posts
Congrats to your daughter on her wedding! I like seeing youngsters get married these days.Seems so many have taken the " it's not necessary" stance. Have fun with that 45-70!

Mop
 

·
Registered
Joined
·
1,545 Posts
anybody have a source for 500 gr or heavier cast bullets, preferably .459"? I'm down to fewer than 50 BTB PD 525 gr.
 

·
Registered
Joined
·
1,611 Posts
Discussion Starter · #17 ·
Gar,

Good powder choice in times where components are like finding chicken lips. What I have on hand for a 1,500-1,700 fps range is 4198. However, Rel#7 and 4198 are close on the burn range chart and Rel#7 should perform equally as well.

The Lyman 4th edition cast manual has two option.

Trapdoor loads with Rel#7

BulletMinFPSCUPMaxFPSCUP
330 gr40.01,63314,60042.01,71116,600
405 gr37.01,53416,40039.01,57817,900

Lever Action loads with Rel#7

PowderMinFPSCUPMaxFPSCUP
330 gr49.01,85316,70055.02,09625,100
405 grnot listed
Just shot the big guy on the range with 40gr of R7 rifle shoots very well, However after 10 rounds in an hour (air blower used) my shoulder said it wanted a word with me. Now I'm a big guy and the biggest gun I have shot is a.458 Lott of the bench and can handle recoil but I think I will try 37gr next time out as shooting is supposed to be fun and a paper target is not that hard to kill. Love the gun 26" cowboy and love the round Gar.
 

·
Registered
Joined
·
2,594 Posts
Gar,

For me, I cast a 260 gr bullet that looks like a cowboy 45 Colt bullet for Big Bore Silhouette. They run around 1,650 fps. I started light bullets with a paper patch on a 230 gr 45 Colt cast bullet with great success.

If hunting dangerous or large game, you will not feel the recoil. However, for a string of 40+ rounds, you need something to tame the recoil. TrailBoss is also your friend.

The attached are good reference for reduced load data. Red Dot is a good option of the 405 gr slug at subsonic velocity.


lowveldata.htm

Hogdgon Cowboy 03.pdf
 
  • Like
Reactions: Gareth Holland
1 - 18 of 18 Posts
Top