I am back to playing with a 243 win, havnt for awhile now. I see a lot of loads with powders like IMR 7828 or H1000.
Good vel, but in 24 and 26" barrels. How would they do in a 22" tube? Only interested in 100 grn bullet loads at this point.

Thirty year’s ago it was well proven that powders which give the highest velocities in long barrels will almost always do so in short barrels. Accuracy may or may not be better, and muzzle blast will certainly be greater.


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Shooting 100 grain bullets in the 243 I have had excellent results using H-450 (no longer available but I still have a couple of pounds), H-4831, and IMR-4831. I'm talking 3150 to 3200 fps in a 22" barrel and consistent 1" groups. Personally I see no need to go to slower powders.

You didn't say what velocity you were expecting to get?
H1000 is not that slow. I use imr4350 for all my 100/105 bullets and get around 2900f/s Mauser with a 22" barrel.
H414 and H4831 are great for the 95gr burger and the 100 gr sierra hp.

I was hoping to get close to 3000 fps. I had always used IMR 4350, but have read lately that it is considered a bit fast and "spikey" pressure wise compared to slower powders.
I have several pounds of H450 and WW 785, so I will start there. Mag primer or not with the ball powders?

If it worked for me I could care less what the articles say

RL17 may get your results, its usually a bit faster FPS vs 4350 for about the same charge, but I believe with a bit less pressure. RL22 would also do it, and If have no qualms using it in a 22" bbl

I have had no problem using H4350, RL-19 or IMR 4831

Once upon a time I would have tried and chrono'd every powder and 100 grn bullet I could get. Now I have to many other more interesting cartridges I'd rather play with, so I'm being lazy and asking you guys what you think.

41grs accurate 4350 RP cases WLR primers pushed 100 grain bullets over 4000ft/sec. With no high pressure indicaters from a 24" barrel. roger

4000?

quote:

41grs accurate 4350 RP cases WLR primers pushed 100 grain bullets over 4000ft/sec

miss-print.. right?

the highest muzzle vel. I have seen are with Magnum and RL-25 both at 102% density, just a tick over 3100 fps 100 grain bullet

Here is what I got from a 22" Rem. factory barrel.
100gr. Nosler Partition.

44.5 IMR4831 3050 fps.

45.5 IMR7828 2956 fps.

I have also used R-26 with good results but have not chrono'd it yet but reports give it a little more speed than those I tried.

I use 4831, no complaints. Use whitetails as my chronograph and they indicate velocity is sufficient.

TJAY
what brand brass are you using with your IMR 4831 loads? I would start low and work up, but want to take in brass capacity too.

h414 works well too

Just did some 243 at the range yesterday.

42grains R17 pushed a 100gn NosPart to 3150fps. Group was sub-MOA at 100 yards, BUT there was a pressure sign, a bright spot on 2 of 3 caseheads.

theback40
Federal brass with IMR4831
Hornady brass with IMR7828

Checked some more and found 45gr H4831 100 Partition got 2900 fps with Rem brass.

45 grains surplus 4831@ 3150 fps 26" barrel, 95 gr NBT. No problems, very accurate, stopped right there. Glad I still have a lot of it left.

Historically the .243 has always leaned towards slow burning powder..H870 was a winner back then but alas it is no more,,the 4831s have always been a good choice.