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I've loaded up ten rounds for my 30-30 with R-P cases, CCI standard rifle primers, 26 grains of 3031 (more than a grain shy of max) and Lyman's gas checked 311041 water dropped bullets. I cycled one cartridge through the gun and inspected the results.

I found 12 little grooves on the bullet, about 0.05" in length. The bullets were seated in the brass all the way to the crimp groove, and the engraved grooves on the bullet were in front of the largest diameter of the bullet that resides just in front of the crimp groove. The gun was purchased new in 1984, and is a Marlin microgroove.

Any red flags here? Of course, all risk (if any) with this load is mine...

The Blade
 

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The pressure curve climbs exponentially but using basic math, you should be around 85 FPS less that the 2016 listed for 27 grains of IMR 3031 and that bullet. The CUP pressure should be around 29,000 with your gun being able to handle much more. If you look at other recipes with that bullet, you'll find one in Lyman's table that reaches 39,000, which is still safe for a solid gun of current manufacture. The bullet kissing the lands should make the pressure peak somewhat sooner but still be safe. To play is safe, pull the bullets and back off another grain and inspect the cases. Then, work up to where you make yourself comfortable.
 

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That bullet was designed specifically for the 30-30 for use in lever guns, the front band is doing what it was designed to do, lightly engage the rifling upon chambering. While this load may not be perfect for your gun, your seating depth looks just where it should be for maximum accuracy.

I love cast bullet loads in the 30-30, they are great! My 788 remington 30-30 shoots that same 311041 bullet into less than an inch with proper loads of RL 7 or 4198.

Happy shooting!

Graycg
 
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