Guys,

Have looked all over the local area for XMR-5744 ... none to be had anywhere.

Is there an IMR powder that is roughly equivalent? Am looking to load 400 gr case slugs in .416 Rigby.

Thanks,

I have read that H5744 is their IMR SR 4759 but I have not used 5744 nor even researched it.

4759 is a high bulk powder for reduced loads. The idea being that with say half of the charge by weight of a normal powder it will fill the case better than a regular powder and being fast burning will ignite well. I don't know what you mean by 400 gr slugs?

www.imrpowder.com/sr4759.html

There's always mail order. Wideners or Natchez will have it. Just buy an 8lb jug and be done with it and any other powders you will need for a while, the prices usually offset the $20 HazMat fee and you can stock up on primers at the same time. I use XMP-5744 in my 416 Rem. with a 375gr RNGC cast from an NEI mold, practice doesn't get any cheaper than that over 40 caliber.

The Hazerdous materials charge on powder and primers makes shipments of less than 32 pounds of powder less economical.

I buy powder and primers locally at Lynwood guns. The gunsmith owner there knows more than me, and that gives me a chance to ask dumb questions.

That is where I got my pound of XMR5744, but he has been unable to get me SP2 or R123. THOSE I may have to pay the haz mat to get.

Mike - IMR 4759 works about the same as 5744. Don't know if they are the same or not, tho.. I've used both in my 416 RMag, same load data for each. Velocities and performance pretty much mirrored each other.

Accurate Arms should have load data for 5744 at their site (don't have a 416 Rigby, so, I never checked), which should work for you. If not, an e-mail to them usually gets quick results. They can probably even let you know if those two are the same powder.

I always use magnum primers in those big cases, even though 5744/4759 are touted as working okay with standards. The Rigby is a lot bigger case than the 416 RMag's, so, the hotter primer will get at all the scattered powder grains.

R-WEST

No direct comparison...but...

Faster to slower:
46. SR-4756
47. 3N-37
48. 800-X
49. AA-7
50. N-350
51. HS-7
52. W-571
53. Blue Dot
54. AA-9
55. 2400
56. N-110

57. XMP-5744

58. R-123
59. H-110
60. W-296
61. SR-4759

Personally I'd use:
RL-25 From 82.7 grains to 105.0 grains
Federal 215 Primer

From the loads I've looked at in AA manuals it seems that IMR 4227 is fairly close. I've tried 4759 in alot of loads over the years, and it's never been my first choice in any load, while 4227 is. I've never used 5744 so I cannot give you a first hand report on it. sundog

After years of loading cast bullets in rifle ammo, I have come to the conclusion that one should NOT use small charges of fast powders in rifle cases, if one is trying to achieve uniformity (accuracy)!! THIS IS PARTICLUARLY TRUE IN HUGE CASES LIKE THE .416 RIGBY!! I would suggest using powders in the 3031 to 4320 burning rate to achieve reduced velocity cast bullet performance. Slower powders give slower acceleration, are ignited more uniformly due to occupying more space in the case, and will produce the velocities you want at much lower peak pressures than the fast powders!! Accuracy is therefore better, because the bullets are deformed less during acceleration. Depending upon what MV you seek, powders as slow as IMR 4350 or H4831 might be appropriate to give you the velocities you want, and if so, will be even better than medium-burning powders. HOWEVER, never use the very slow powders in loads less than 10% below normal, jacketed bullet loads for those powders, to avoid unpredictable pressure excursions!! (S.E.E., etc.)

[ 04-26-2003, 21:05: Message edited by: eldeguello ]

I still don't know what "load 400 slugs" means?

If it's a reduced load then IMR's SA 4759 is an outstanding choice. I have proven this in decades of very accurate cast bullet loads for the .375 H&H and a winning load for the 38-55 Schuetzen.

For "full power" cast bullet loads in the .375 H&H that get about 2200 fps with a 270 gr cast bullet use IMR 3031 and a 0.7 gr tuft of kapox to hold the powder against the primer. Loads in cast bullet manuals should be consulted for that cartrige.

Imr's SR 4759 can make very accurate loads. Both my friend and I use it in our varmint rifles for reduced loads and they will out shoot most any run of the mill Hornet.

mstarling,
Go to link below. this is the cheapest price i have found so far for A/A 5744. HTH
Rick

http://www.powdervalleyinc.com/