9mm too slow?

[pearcetopher]

Hi guys, went to the range today firing the lee 355-125-1r rn. loaded to 1.060 with 3.3 grains of bullseye.

Everything functioned fine after firing 250 rounds with no lead in the barrel.

Accuracy seemed terrible but this is an extremely small 4 inch barrel norinco. I was surprised the load cycled as I didnt think it had enough powder and recoil was very very light.

was it me or can having too little pressure behind a 9mm cause accuracy problems but not leading?

[BIGRED]

I experienced the same thing a while back. Upped my powder charge and accuracy came back. I am shooting 9mm @ 4.2 gr bullseye with the Lee 124gr TL sized .356 oal @ 1.05" yes they are short but my sigs and a few glocks gobble them up and shoot where I am aiming.

[pearcetopher]

jeese arent you reaching pressure maximum with that much powder?

[tazman]

Not enough information to say for sure.
My Alliant book call for up to 4.2 grains of Bullseye under a 125 grain lead bullet in 9mm but I think that load might be a bit too heavy. More like 4.0
This would suggest your load was too light but not terribly so. It may be that your pistol prefers a different weight powder charge. I would suggest loading some test rounds starting at 3.3 since you know that one is safe and working up .2 grains at a time until it gets better or you get to the suggested max load.
Have you slugged your barrel? What are you sizing your bullets?

[BIGRED]

The bullseye powder I have is 30+ years old. The last jug was just opened and still had the hercules name on it. This may have something to do with its burn rate. No pressure signs and is honestly a mild load. Factory ammo has more recoil than these loads.

[dubber123]

Curious as to the sizing too. The last Norinco 9mm I fooled with was a 2.5" gun at 25 yds. without much for load development. I sized that one to .358"

[JeffG]

Hi guys, went to the range today firing the lee 355-125-1r rn. loaded to 1.060 with 3.3 grains of bullseye.

Everything functioned fine after firing 250 rounds with no lead in the barrel.

Accuracy seemed terrible but this is an extremely small 4 inch barrel norinco. I was surprised the load cycled as I didnt think it had enough powder and recoil was very very light.

was it me or can having too little pressure behind a 9mm cause accuracy problems but not leading?

The data I got directly from a call to Alliant for a 124/125 gr cast bullet in 9mm called for 3.8-4.3 gr Bullseye.

[tazman]

This brings up the topic of the seemingly ever changing published data coming from Alliant these past months/years.
I am not refuting what anyone says about where they got their data. However, I have noticed that the data on their website is somewhat different than data published as little as 4 years ago. It also differs slightly from the data on their website before the recent update they made to their site. I have a print out of one of the data tables to prove it.
I can't believe the powder formulation or testing procedures have changed that much in just a couple of years.
Makes me wonder just what is happening here.

[Teddy (punchie)]

How many pound spring do you have? The spring can be changed. An area to think about.

[runfiverun]

they changed the base for their powder for one
and they started using transducers to measure pressure for another.

the norinco's do like 358 diameter, and a bit harder than ww alloy.

[Mlcompound]

I have used 4g bullseye under a lee 358-125-rf with excellent results in many different 9s.

[NSP64]

I shoot 3.0 gr of 231 under the lee 125 RNFP boolit(130 my alloy) in my 9mm
Too slow can be inaccurate
Bullets have a min and max rpm for accuracy. That's why reloading can often be more accurate than factory. We adjust the powder/bullet combo for each gun to find the sweet spot.

I run all my 9mm/38/357 boolits @ .360"

The gun may function with as little as 2.8gr of bullseye, but may be most accurate @ 4.0-4.2 gr

[paul edward]

I have had good results with 4.2 gr Bullseye and 120 grain boolits cast in a Lyman 356402 mold.