I ordered a large supply of 75 gr BTHP Bullets. In my Hornady manual a load is listed for H4895. However when I purchased powder I accidentally grabbed IMR4895 would like to use it if possible. I have read many conflicting statements as to the interchangeability of the two. I was thinking of decreasing the charge weight by 10% on the minimum side and working up from there. Thoughts?
Hornady 75 gr BTHP 223 loads
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I do not know the exact difference between them but Hodgdon lists both powders with a different, but same weight bullet. Again not sure if that is useful or not?
http://www.hodgdonreloading.com/
http://www.hodgdonreloading.com/
KansasSasquatch
Member
In theory you should be fine using the 75gr data that Hodgdon lists. The Hornady 75gr A-Max and Match bullets are supposed to be a VLD type design. Hodgdon used a different brand of bullet but's it's a VLD. And for another reference, Lyman lists 21.6gr to 24.0gr of IMR-4895 with a 75gr A-Max, Max pressure of 49,100 CUP, at 2720fps on the high end, 2.390" COL.
Edit: Lyman also shows 77gr HPBT with a 22.0gr to a 24.5gr+ compressed load, Max pressure of 46,100 CUP, at 2771fps on the high end, 2.260" COL.
Edit: Lyman also shows 77gr HPBT with a 22.0gr to a 24.5gr+ compressed load, Max pressure of 46,100 CUP, at 2771fps on the high end, 2.260" COL.
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KansasSasquatch
Member
Rule3 brings up a good point. The Lyman data I gave you above for the 75gr A-Max shows a COL of 2.390". That obviously won't work for an AR. If you are loading for an AR you'll probably want to use the Hodgdon data for the 75gr VLD, which is 21.2gr to 23.8gr (compressed load) and seated to 2.250" COL.
Personally I'd probably start with Hodgdon's VLD data if I were loading for an AR. If it's a bolt action I'd probably use Lyman's A-Max data if my rifle were okay with that long COL.
I will try and give them a call on Monday I'm in no hurry as the bullets are not here yet. I also haven't got the main rifle I'm going to be working the loads up for built as I'm waiting on the rest of my parts. Hopefully I can have everything started and going by next weekend. Want to get a few loaded at different weights see how that does. Then once I get a charge nailed down I'll start swapping primers until I find the magic ones
W.E.G.
Member
H4895 is a faster powder than IMR4895
DO NOT under any circumstances regard load data as "interchangeable" between these to sound-alike powders. Shame on whoever came second in the naming-game, and decided to name the second (and quite different) powder by the sound-alike name.
Maximum OAL for magazine-length 5.56 ammo is 2.260.
A wise handloader will load to 2.250 to allow for any variation (the occasional long round) to ensure reliable feeding.
Always check your case capacity, because it is a critical factor in how much powder is safe.
It is generally agreed that most commercial brass is 30.0 grains H2O.
That INCLUDES Lake City brass.
If anybody tries to tell you Lake City 5.56 brass has less case capacity than other "commercial" brass, don't receive any further information from that individual.
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DO NOT under any circumstances regard load data as "interchangeable" between these to sound-alike powders. Shame on whoever came second in the naming-game, and decided to name the second (and quite different) powder by the sound-alike name.
Maximum OAL for magazine-length 5.56 ammo is 2.260.
A wise handloader will load to 2.250 to allow for any variation (the occasional long round) to ensure reliable feeding.
Always check your case capacity, because it is a critical factor in how much powder is safe.
It is generally agreed that most commercial brass is 30.0 grains H2O.
That INCLUDES Lake City brass.
If anybody tries to tell you Lake City 5.56 brass has less case capacity than other "commercial" brass, don't receive any further information from that individual.
.
.
.
.
W.E.G.
Member
If you don't feel compelled to get every last FPS out of your 5.56 ammo, and you don't want to beat your brass to death on just one firing, keep the loads moderate.
24.0 grains IMR 4895 will do you right.
24.0 grains H4895 is probably fine too, but it will be near SAAMI max.
If you must persist in playing with two sound-alike powders in your reloading room, I recommend you run the H4895 at least 0.2 grains less than the IMR.
24.0 grains IMR 4895 will do you right.
24.0 grains H4895 is probably fine too, but it will be near SAAMI max.
If you must persist in playing with two sound-alike powders in your reloading room, I recommend you run the H4895 at least 0.2 grains less than the IMR.
W.E.G.
Member
AR15 rifles are rated for 5.56 pressures.
Way too much information in published manuals and online resources on the internet use max pressures for .223 Remington.
SAAMI max pressure for 5.56 is 62,366 PSI
SAAMI max pressure for .223 Remington is 55,000 PSI
Way too much information in published manuals and online resources on the internet use max pressures for .223 Remington.
SAAMI max pressure for 5.56 is 62,366 PSI
SAAMI max pressure for .223 Remington is 55,000 PSI
Thank you very much W.E.G. I appreciate the Data the load will be going into a Noveske 10.5" stainless barrel Velocity will suffer greatly as such. I don't mind however keeping pressures moderate to sustain better brass life. I just want to develop a good accurate load for my new rifle. Some may find it odd to work a load for a rifle that's practical purpose is close range but I want to see how accurate I can get it.
gamestalker
member
Hodgdon publishes the same bullet with H4895 as having a higher start and higher max charge than IMR-4895.
As per Hodgdon:
75 gr. VLD - H4895 - 22.5 - 24.5 grs.
75 gr. VLD - IMR-4895 - 21.2 - 23.8 grs.
That said, IMR-4895 would be .2 grs. above published max at 24.0 grs.
According to Hodgdon, 24.0 gr. of IMR-4895 with that bullet, would be above published max.
Rely only on published data, and not second hand information. Locate some published data that applies to the components you've chosen, and not the second hand data I've posted above.
GS
As per Hodgdon:
75 gr. VLD - H4895 - 22.5 - 24.5 grs.
75 gr. VLD - IMR-4895 - 21.2 - 23.8 grs.
That said, IMR-4895 would be .2 grs. above published max at 24.0 grs.
According to Hodgdon, 24.0 gr. of IMR-4895 with that bullet, would be above published max.
Rely only on published data, and not second hand information. Locate some published data that applies to the components you've chosen, and not the second hand data I've posted above.
GS
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