COL Question - 9mm CAM Pro 147gr RNFP

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Rebes

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Hi everyone,

I have a question about the COL for 9mm. I'm reloading with CAM Pro 147gr RNFP plated bullets, with 4.5gr of Unique. On the left in the pic is a bullet seated to 1.060, which is the spec provided directly from CAM Pro elsewhere on the forum. On the right, same bullet, seated at 1.200, which is just shy of where the bullet touches the lands in the barrel on my Ruger SR9. Anything more than that, and it won't spin or drop out freely, but up to that point, plunk test passes no problem. Obviously the one on the right is ridiculous, it's not seated enough just looking at it. My question though, is should I be seating somewhere between 1.060 and 1.200, because that's where I hit the lands on my barrel, or should I just stick to the 1.060 spec'd by CAM Pro?

http://imgur.com/MRd5C9h
 
will the 1.2 fit into your mags? i would go with 1.120 for no real reason other then it's the middle road between the 2 lengths.
 
Funny you ask, after I posted that, I went and tried that exact thing... 1.200 will not fit in the mags, they bind up. So I shortened them down to the point where they fit, which ended up being about 1.175. Feeding them through the gun though, I'm not sure I like the feel of the action at 1.175...
 
1.060 is very short and not usual. 1.100 to 1.130 is the standard for most production pistols. the 1.200 you mentionned is usually found for 40S&W in 2011 (double stack guns ). the max aol for 9mm ammo is 1.168.

checks your mags, they're also the limiting factor. once fully loaded the tip of the bullets shouldn't drag the mag walls, otherwise FTF and FTE are on the menu.

the CZ shadow like 1.100 aol.some like hangus hobdell was loading 1.085 which is quite short. generally CZ chambers and mags requires a short AOL.
 
Thanks bigedp51, that's a good post there... I do find that at 1.200 - 0.015 = 1.185, the mag doesn't like them... at 1.175, they fit in the mag, but I don't know yet how they will feed in a live fire situation... It seems like at 1.175, there's not much in the case (Measured about 0.22" in the case). It does make some sense from his diagram showing the different barrel types, that the Ruger has a little more distance before you are hitting the lands.

sigtactical, I agree, 1.060 seems a bit short... I was basing that on the data posted from CamPro earlier in the forum.

I've also seated one at 1.120 just to see, and it puts about 0.26" in the case. That should feed no problem in my gun... It also looks more normal than the 1.175 load.

The CamPro load calls for 4.3 to 4.7 grains of Unique, so I was using 4.5 at 1.060. If I go to 1.120, should I bump up the powder by a small amount (0.1 or 0.2?) or should I stick to 4.5 and chronograph it, then see if I need to bump it up a bit?

Below is a picture of the three side by side... The line is approximately the bullet depth.

http://imgur.com/y4ibeCg
 
Rebes said:
Thanks bigedp51, that's a good post there... I do find that at 1.200 - 0.015 = 1.185, the mag doesn't like them... at 1.175, they fit in the mag, but I don't know yet how they will feed in a live fire situation... It seems like at 1.175, there's not much in the case (Measured about 0.22" in the case). It does make some sense from his diagram showing the different barrel types, that the Ruger has a little more distance before you are hitting the lands.

sigtactical, I agree, 1.060 seems a bit short... I was basing that on the data posted from CamPro earlier in the forum.

I've also seated one at 1.120 just to see, and it puts about 0.26" in the case. That should feed no problem in my gun... It also looks more normal than the 1.175 load.

The CamPro load calls for 4.3 to 4.7 grains of Unique, so I was using 4.5 at 1.060. If I go to 1.120, should I bump up the powder by a small amount (0.1 or 0.2?) or should I stick to 4.5 and chronograph it, then see if I need to bump it up a bit?

Below is a picture of the three side by side... The line is approximately the bullet depth.

http://imgur.com/y4ibeCg
Click to expand...

I would stick to the 4.5 and see how it performs, adjust from there.
 
Done! Loaded up 20 rounds at 1.120", with 4.5gr Unique... Will take them to the range tomorrow to see how they perform.

Thanks for the tips!
 
Rebes said:
Done! Loaded up 20 rounds at 1.120", with 4.5gr Unique... Will take them to the range tomorrow to see how they perform.

Thanks for the tips!
Click to expand...

I would load up other charges as well just to get a better idea of what works best, unless of course your one lucky SOB who's range is in their backyard..
 
Spawn-Inc said:
I would load up other charges as well just to get a better idea of what works best, unless of course your one lucky SOB who's range is in their backyard..
Click to expand...

Yeah, I'll shoot these to see if I'm in the ballpark, then load up groups of 10 to see what works best. Will be heading out tonight for that.
 
Max OAL for 9mm is 1-169". You can go out that far without mag binding. You may find in your range testing that a shorter OAL may start feeding problems, as I did with my XD9. I now load to max OAL and don;t worry about mag binding or feeding issues.
 
I run 147s with 1.12 in my CZ shadowline and glock. I had them out to 1.14 at one time, but I tend to lend ammo to some people and it doesn't work in all pistols.
A commercial reloader here loads it to 1.10 so they will work with some nice Tanfoglio Extreme II/III's.
 
Alliant lists 4.3gr Unique max at 1.130 for 147gr HP, so the CamPro listing at 4.7gr max Unique at 1.060 seems kinda high. I have been shooting them, but accuracy was horrible... Primers were showing some cratering. How much would being too high on powder and COL too short affect accuracy?
 
I was loading Campro 147gr RNFP at 1.100" for a couple of years now on top of Longshot and more recently N320. After seeing the Campro's suggested COL I did some test batches at 1.080" and 1.060". Seems to work fine at 1.060" and I should be able to drop my powder charge down .1 to .2 grains. Going to load up a couple hundred for a practice day this weekend. See if there's any feeding problems.

View attachment 52112
 
I will give 3.8 and 4.0 a try at 1.120... I was seeing signs of high pressure at 4.5 at 1.120. Primer was flattening, and getting some cratering...
 
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