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I have been working up loads with 440 grain LBT LFNGC bullets in Remington cases with CCI 200 primers over RL7.  I'm concerned that my last load of 47 grains RL7 which averaged 1890 fps is probably too much.  Extraction was easy but I still wonder if 1900 fps with 440 grain bullets is too high a pressure range with RL7.  This board is a great source of info and I would appreciate any and all comments.  The gun is a Marlin 1895 Guide Gun.
 

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John,

That load is pretty warm for RL-7!!!  I surely wouldn't go a speck higher with that load.   I think that if you want to operate in that velocity envelope with the 440g LBT bullet, that you might consider perhaps looking at H322, it will get you close to that velocity with safe pressures as well, but even so, you're really pushing the pressure envelope.

I think that life would be much more serene and comfortable as far as pressures go, to sacrafice 100 fps, and be happy.   Don't worry about getting that 1900 fps mark, until some critter stands up after being shot with an 1800 fps load and tells you it wasn't enough!

Just my opinionated &#36.02 worth!

God Bless,

Marshall
 

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Thanks Marshall,

You just confirmed my own suspicions and I certainly don't need 1900 fps.  45-46 grains was in the mid 1700's to 1800 and that's plenty as you aptly pointed out.  I have experimented with H322 and the same bullet and may do so again, but accuracy was better with the RL7.  

Congratulations on a great site and forum!!
 

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Gentlemen, FWIW, Lyman shows a loading for their #457193 420 gr bullet at 2.550 COL with 48.5 gr Re#7 and Rem cases and primers. It clocks 1828fps and generated 25,000CUP in the pressure barrel. (Perhaps that load JohnC is using is at MAX Safe.) Lyman has it listed for the old 1886 Win and Old M1895 Marlin. What the difference in bullet design and 20 more gr weight does for pressure is the big ??
 

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I'd have to agree with Marshall.  RL7 with that much lead would make me a little uncomfortable.

In addition to h322, you might give Benchmark a try.  Its a little slower than h322.

Here is 'rules of thumb' I use to select powders for new 45-70 bullets.

4198/rl7 for 300-350gr bullets
h322/Benchmark for 400 grain bullets
h4895/benchmark for 450s
h4895 for 500s

I've not gotten myself in too much trouble following this and thought you might find it useful.
 
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