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Originally posted by Doc Garnett:
"All things being equal" ( which we all know never are ) which powder(s) should theoretically be most likely to (1) be most efficient and (2) deliver the highest velocity?
-- Doc

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Hmm, for velocity MRP or MRP-2. Have not yet tried Reloder 25, but Re 22 is right up there with the MRP - could well be that Re 25 surpasses the MRP's...

Mind you that a) you don't need all the velocity you can get, and b) you'll have a hard time filling the case with these slow powders.

What you mean by efficiency I don't know - if you're looking for "FPS per grain" then N 150 is probably the best choice, but it's a funny powder...

-- Mats

I did a lot of tests with the following :
IMR4831 , Rel 19 and Rel 22 ( as well as SA powders -> Somchem S365 ( = IMR4350 ) and S385 ( =Rel 22 ).)
Best results on velocity was Re22 and S385 .( Both : 48 gr = 4650 fps )
Best on accuracy (Styer Mannlicher SBS Prohunter ) was Rel 22 and S385 .(one inch 3-shot groups at 200m )

The second best in accuracy was achieved with Rel 19 ( 46,5 gr = 2640 fps ) .

Look at Saeeds' reloading pages . He achieved some impressive groups with Rel 19.

BTW : I used Sierra Matchking 140 gr and R-P brass ( as well as LAPUA ) .

VV-N165 shows up at 2641 fps and a 97% full case. If you don't like compressed loads, this is a nice place to be.

Accurate Arms XMR4350 is the first powder to show 100% burnt at 2630 fps - the case is 91% full.

IMR4895 at 2580 fps is probably a very comfortable load to shoot, it will be all burnt six inches before the muzzle, giving low flash and low blast with reasonable velocity. The case would be 91% full.

HTH,
Don

Menander

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Originally posted by Menander:
What do you mean with "funny"?

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I sometimes get pressure symptoms (sticky extraction) with anemic loads, and it is very primer sensitive. But accuracy is great.

-- Mats

I used N560 with 140gr to get 2700fps (48gr max load) with no pressure signs or muzzle flash from a 24" barrel. It's not very clean.