Accurate Arms for 45/70

[UncleNorby]

I'm at work where I can't access AA load data. My LGS does not have IMR 4198, but he does carry a good amount of Accurate Arms powders. Does anyone have a good recommendation for an AA powder with Hornady's 325 gr flextip?

I'm loading for a Marlin 1985. Thanks for any info!

 

[kludge]

Nothing specific... Here's the Accurate online data.

45-70 Government (Standard Rifles less than 28,000 psi)
Barrel: 24" ■ Twist: 1-20" ■ Primer: WIN WLR ■ Bullet Diameter .458"
5744 300 SIE HP FN 36.7 1,712 40.8 1,874 27,200 2.550
5744 350 HDY RN 33.8 1,529 37.5 1,676 27,700 2.550
5744 400 SPR FN 29.7 1,460 33.0 1,610 27,800 2.540
2015 300 HDY JHP 51.8 1,836 57.5 2,069 27,300 2.550
2015 350 HDY RN 47.3 1,703 52.5 1,890 27,800 2.550
2230 300 SIE HP FN 43.2 1,747 48.0 1,901 27,600 2.550
2230 350 HDY RN 42.3 1,623 47.0 1,776 28,000 2.550
2230 400 SPR FN 41.3 1,525 46.0 1,715 27,800 2.550
2230 500 HDY RN 32.8 1,167 36.4 1,306 27,400 2.550

 

[UncleNorby]

Accorindg to the Hodgdon site, the Marlin 1895 can handle loads to 40K CUP.

Does the online data include anything for up to 40K max CUP? Thanks for looking into this.

 

[kludge]

Accurate lists Trapdoor(<18kPSI), Standard (<28kPSI), and Ruger #1,#3 (<40kPSI).

Note that Accurate's data PSI and Hodgson's data is CUP and they are not interchangeable. For what it's worth the ballistician at Alliant has been very prompt in returning my emails.

Hodgdon data for Ruger #1 and #3 is for 50k CUP, so based on the usage, the correct data for the 1895 is listed above.

40kPSI data (Ruger #1, #3)
45-70 Government (Ruger No. 1 and 3 less than 40,000 psi)
Barrel: 24" ■ Twist: 1-20" ■ Primer: WIN WLR ■ Bullet Diameter .458"
5744 300 SIE HP FN 43.2 1,986 48.0 2,159 38,900 2.550
5744 350 HDY RN 39.4 1,771 43.8 1,929 38,000 2.550
5744 400 BAR FNSP 36.9 1,620 41.0 1,787 38,100 2.550
2230 300 HDY JHP 56.0 2,092 62.2 2,275 38,200 2.550
2230 350 HDY RN 48.6 1,797 54.0 1,922 39,000 2.550
2230 400 BAR FN SP 46.8 1,745 52.0 1,865 38,300 2.550
2230 500 HDY RN 39.6 1,408 44.0 1,552 38,800 2.550
Lead Bullets
5744 405 LC FP 36.0 1,667 40.0 1,826 38,400 2.550
5744 420 CP LFNGC 35.1 1,641 39.0 1,783 38,200 2.550
5744 440 CP LFNGC 32.9 1,558 36.5 1,705 38,000 2.550
5744 460 CP WFNGC 32.6 1,523 36.2 1,666 38,200 2.550
5744 500 LC FP 27.0 1,400 30.0 1,550 38,200 2.550
2230 405 LC FP 48.2 1,845 53.5 1,978 38,700 2.550
2230 420 CP LFNGC 46.8 1,791 52.2 1,920 37,400 2.550
2230 440 CP LFNGC 42.8 1,674 47.5 1,804 38,600 2.550
2230 460 CP WFNGC 42.8 1,668 47.5 1,782 37,900 2.550

 

[UncleNorby]

The Hodgdon site indicates max loads for the Marlin 1895 with 350 gr bullets over 2000 fps, some over 2100 fps. If 28kPSI roughly equates to 40K CUP, it would appear that AA powders are about 300-400 fps slower than some others as far as the 45/70 goes. Strange that there is that much difference, but hard to know when we aren't compairing apples to apples.

I'd like to be closer to the hodgdon 40KCUP numbers than the AA 28K PSI numbers. Not that I need the fastest load. I'll be shooting at less than 150 yds for sure. Thanks for looking into it.

 

[kludge]

Based on other cartridges that I load, I would think that 28kPSI is not equivalent to 40k CUP, but the two test methods can only be roughly correlated, and certainly not between cartridges.