Originally Posted by Riflecrank
Sir Bob,

Your penetration testing underscores the excellence of the 400-gr/.458 FN solid.
I was not worried about it a bit, however. I am convinced.
Will look forward to your results with the 250-gr Hornady Monoflex at your blog.
I have tried them and my favorite load is a bit unusual: AA-5744 for a non-reduced load.

With a COL of 3.340" (SAAMI compliant, ha ha), Hornady brass, F215 primer,
in a 24"-barreled Ruger No. 1, at 67*F:

65.0 grains of AA-5744 >>> 2725 fps corrected to MV.
3 shots in one hole at 50 yards.

For my top velocity with no signs of excessive pressure, same details for rifle and loading as above except different powder:

82.0 grains of H4198 >>> 3075 fps corrected to MV.
3 shots also made one hole at 50 yards
but the cloverleaf was almost twice as large.

BTW, 65.0 grains was the starting load with AA-5744 and was most accurate.
69.0 grains (my max tried) gave 3003 fps MV.

Starting load with H4198 was 78.0 grains and gave 2913 fps MV.
82.0 grains was the maximum tried with H4198.

AA-5744 averaged near 70 fps MV increase for each grain of powder increase.
H4198 averaged about 40 fps MV increase for each grain of powder increase.
250 grains is mighty light but the monometal construction makes it good,
even at as low as 2000 fps MV according to bulkie_roll, his powder charge not mentioned, yet.
3075 fps MV is down to 2057 fps at 200 yards.
2725 fps MV is down to 1998 fps at 150 yards, 1785 fps at 200 yards.
Might as well use the slower load that gives up barely over 50 yards range.

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Of course, a Lee Factory Crimp Die works without the third cannelure, for any COL you want.







Sir Ron;

I really do appreciate this, especially since you did it using the Ruger #1!

I've just sat down at my reloading desk, planning a load for the 250 MonoFlex using AA5744! I had calculated that 36 grains should give somewhere near 2000 fps. But having already written the draft for Saturday's blog, I mentioned in it that I was aiming for a top Marlin load of about 2500 fps, but also mentioned that 3000 fps would be possible. For that I figured 81 -82 grains of H4198! That's all I can get into a Hornady case and seat a bullet about 1/4". I've used 82 of H4198 under the 300gr TSX for close to 3000 fps (2980 fps).

But instead of immediately going ahead with my plan for AA5744, I chose to read anything new on this thread, while hoping for an answer to my question re 2000 fps from the 250 MonoFlex. So, I got my answer anyway! I didn't know I could use that much of AA5744 within safe pressures - now I know.

Yesterday, I'd already loaded 9 of the 250 MonoFlex, 3 each as so: 69 grains of H4198 which I estimated at ~2650; 73 grains of H322 for an estimated 2550 fps; and 75 grains of H322 for an estimated ~2625 fps.

NOW! Your load of 65 grs of AA5744 at 2725 fps will go into 3 Hornady cases, WLRM primer and COL of 3.4" ! (The others are 3.3" COL). Will get-er-done immediately! And tomorrow's weather looks favorable, so up early (6 am) for departure at 7:30 am, arrival at range 1 hour later, check in (we now have an electronic digital card to open gate while staying in vehicle and close gate in same manner - that's my check in with a personal identification so they always know who's there. Same procedure on leaving!.) set up Chrony, etc, shooting starts at 9:30 am. I'll use the 50 yard berm as my Ruger #1 is now sighted for the 405gr at 100 yards going 2100 fps. I'll aim at the bottom of the target at 50 to get (hopefully) on paper.

Bob
www.bigbores.ca

"What shall it profit a man if he gain the whole world and lose his own soul" - Jesus