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So I have been loading 370 and 405 grain cast bullets to the 1800 fps level and decided to develop some different loads. I decided to drop my cast lead loads down to about 1500 fps for plinking and target shooting and load jacketed bullets for higher speed loads. I picked up several boxes of Hornady 350 grain JSP Interlocks and am using 405 grain hard cast SWC from PENN Bullets. I also had a box of factory ammo with 350 grain JSP that I chrono'd out of couriousity. I bought that box from a vendor at a gun show that sold mostly reloads but the box said it was new and I confirmed it with the vender but who knows for sure. I thought I would post my results because I am always scouring load data on the internet and I know a lot of other reloaders do to, so maybe others will find this useful. I was using a H&R Stainless Ultra Hunter single shot with a 22" barrel and a Stainless Marlin Guide Gun with an unported 18.5 " barrel, Caldwell chrono. I fired 5 round strings of each different powder loading through each rifle. Here are my results.

H&R single shot/22" barrel Marlin GG/18.5" barrel
350 grn JSP Factory New
1551 fps 1453 fps

350 Grn Hornady Interlock
52.0 Grns 3031 = 1961 fps 1851 fps
53.0 Grns 3031 = 1984 fps 1882 fps

405 Grn Hard Cast SWC
45.0 Grns 3031 = 1735 fps 1630 fps
41.0 Grns 3031 = 1601 fps 1477 fps

I liked the 52.0 grns of 3031 load for the 350 grn Interlock and the 41.0 load for the cast lead loads. I can't really comment on accuracy because I was focused on speeds but now that I have found the recipes I like, I will load up a batch and see how accurate they are.
 

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Might I suggest loading for accuracy then seeing what speed they are? I've done this for years & the results are pleasing.
You are getting good speed with your 405gr lead bullet & IMR3031
 
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According to the Hodgdon reloading recipes, for a 45-70 with a 24" barrel, using 3031 with Hornady Interlock(JRN) max load (for Marlin lever action pressures) is a compressed load of 60 gr. @ 2135 fps and with a 405 gr cast is 48.5 gr. (Trapdoor pressures) @ 1706 fps. So if it's only about max velocity, while you have approached or bettered the velocities, you've got a ways to go with more powder (assuming you work up the load with no signs of excess pressure) . However you are getting into dislocated shoulder territory (eg punishing recoil), so don't hurt yourself :)
 

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My load for the 405 grain Woodleigh Weldcore bullet is: case -WW, primer - CCI-200, powder - 52.5 grains IMR-3031, COAL: 2.56”(crimped to cannelure).
Lee Factory Crimp die did a fantastic job. I applied crimp 3 times as I rotated the cartridge about 90 degrees each time for a perfectly homogenous crimp.
The Hodgdon data calls for a starting load of 51 grains & a max of 55 grains of ‘3031 with the Speer 400 grain bullet.
Absolutely NO pressure signs in MY Remlin 1895GS.
The circumferences of the fired primers were round as a baby’s derrière and extraction was effortless.
No unburned powder.
This is 0.5 grains ‘3031 shy of the classic Elmer Keith 45-70 load.
< 1” 3-shot group clusters @ 100 yds off a rest.
~ 1840 fps
Recoil substantial but not too shoulder jarring.
 
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