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Discussion Starter · #1 ·
I'm having a somewhat challenging time trying to find some updated/modern data for loading this bullet. I find info on others like speer but really want to experiment with the rem 300jhp.

Anyone work up loads or have some info on the data?



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You can adapt the 300 grain Remington HP to any published 45-70 300 grain bullet load by reducing the starting charge by 5% to 8% and working up carefully toward the maximum watching for signs of excessive pressure or velocity.

This is the Hodgdon #27 data for the Marlin 1895 45-70:
Marlin 1895 45-70
300 grain Sierra ProHunter hollow point bullet seated to 2.525"
Winchester brass
CCI 200 primer
55 grains H4198 START 2221 fps 24" barrel
60 grains H4198 MAXIMUM 2424 fps 24" barrel

So, you could start with 51 grains of H4198 under your 300 grain Remington hollow point. It is likely that you will not want to go much over 55 grains anyways as the Remington 300 grain hollow point will become a bomb at close range at 2200 fps.

This is my adapted Hodgdon #27 load:
Marlin 1895 45-70 22" barrel
300 grain Hornady hollow point seated to 2.55" and crimped with a Lee Factory Crimp Die
Winchester brass, 2.1" trim
CCI 200 primers
51 grains H4198 START LOAD
55 grains H4198 HUNTING LOAD 2180 fps
 

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jackfish said:
You can adapt the 300 grain Remington HP to any published 45-70 300 grain bullet load by reducing the starting charge by 5% to 8% and working up carefully toward the maximum watching for signs of excessive pressure or velocity.

This is the Hodgdon #27 data for the Marlin 1895 45-70:
Marlin 1895 45-70
300 grain Sierra ProHunter hollow point bullet seated to 2.525"
Winchester brass
CCI 200 primer
55 grains H4198 START 2221 fps 24" barrel
60 grains H4198 MAXIMUM 2424 fps 24" barrel

So, you could start with 51 grains of H4198 under your 300 grain Remington hollow point. It is likely that you will not want to go much over 55 grains anyways as the Remington 300 grain hollow point will become a bomb at close range at 2200 fps.

This is my adapted Hodgdon #27 load:
Marlin 1895 45-70 22" barrel
300 grain Hornady hollow point seated to 2.55" and crimped with a Lee Factory Crimp Die
Winchester brass, 2.1" trim
CCI 200 primers
51 grains H4198 START LOAD
55 grains H4198 HUNTING LOAD 2180 fps
Jackfish is 100% right but what would be the signs of excessive pressure or velocity with different powder lots and the SAAMI barrel in 24 inches and ours are 18.5-22 inches??????????Just curious!!!!

Jayco.
 

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Discussion Starter · #4 ·
Heheheh, I wasnt going to ask Jackfish what the signs of pressure are :lol:

I sure appreciate hearing this from the vets here because it's something I wouldnt have tried myself.


Have any of you noticed the differences in load max between Hornady and Hodgdon powder load data? Check out the data for the 4502 (350RN) and H4198 powder....like several grains. Not good. I told my gun dealer what my 51gr load shot like and he asked what the primers looked like. I grabbed his data and explained it looked like Hornady is taking the safe/lawyerly route on this one.


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Perf-Pressure signs for the 45-70 are "Not" going to show up untill your way over max..Even Hodgdon Data at 40.000 CUP will not show up in primers etc at 45,000.I know people on this forum from the Marlin forum that took 52,000 Cup loads checked by Hodgdons and run 40 of them thru the the Marlin 45-70 without any adverse affects on the gun from a gun smith.

Not the thing to do,but it was done.Think about the .475 and .480 in the same action????????????????

Best of luck..Jayco.
 

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Discussion Starter · #6 ·
I dont think I'll be pushing the limit anytime soon. Still have too much fun with sub-max loads! Just today was shooting some 1800+fps stuff that felt alot better than the 2000+.....will be saving the hot stuff for bear.

You guys have helped me alot with general knowledge (and then some) in reloading.


Thanx!

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