10mm 180gr campro hp...

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Smcx

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So i loaded up a few campro 180gr hp's with 9.1gr of power pistol. Shot them today out of my gen 4 glock20.

I normally shoot 3-4" groups at 25 yards. These handloads however didn't even group. I'm guessing 4 FEET at 25 yards. It almost looked like they were curving?!?

Any suggestions, or am I pushing campros too hard?
 
I know I use 8.5gr behind a 180gr Hornady XTP. It chronos about 1180 fps, yours may be a bit hot

what OAL and crimp do you use?
 
Max OAL. Did a bit of interweb surfing. Apparently the plated bullets don't do well in the stock glock barrel when pushed past 1200. Guess I'll just have to use xtp's
 
I'm pushing plain TC style bullets to 1400fps so I doubt that is it. Campro bullets are an exception to the rule when it come to watering down loads.
 
Hmm. My 44 magnum sure doesn't like them. I can't imagine that I'm over crimping them in 10mm. Are you shooting your 1400fps out of a stock g20 barrel?
 
9.6 grains of Longshot. I have found it gives the highest velocity of any powder I have used 10mm, 800x might do a bit better but it doesn't meter very well.
 
Take a peek inside several of the hollow point cavities. Is it clear and clean or do many of the bullets have white granules packed in? If so, use the point of a large sewing needle and pry them out.
I had this exact problem with a box of 1k 9mm CamPro 124g HP. I think the granules are some form of tumbling media and they throw off the intended path of the bullet. I sorted mine and clean cavities shot acceptable groups while the clogged-up cavities were all over the place...
 
I shoot these same bullets out of my 10mm's, a little over 1400 fps in my long slide 1911 with no issues. Could be the polygonal barrel in the Glock or you're not doing enough testing to find the sweet spot.
 
Smcx said:
Hmm. My 44 magnum sure doesn't like them. I can't imagine that I'm over crimping them in 10mm. Are you shooting your 1400fps out of a stock g20 barrel?
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Plated bullets in generally should not be crimped. Measure the case wall thickness. Double it, and add the bullet diameter. Deduct .0005. That's the diameter at the case mouth.
 
Canuck223 said:
Plated bullets in generally should not be crimped. Measure the case wall thickness. Double it, and add the bullet diameter. Deduct .0005. That's the diameter at the case mouth.
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True but campro are nearly 3x thicker than everyone else. They are to be treated like jacketed bullets. You would need an extremely heavy crimp to compromise the plating.
 
Depends on the crimp, in autos, you need to avoid the roll crimp and use a taper or factory crimp die.

roll crimps cause too much excessive pressures. In a revolver you should keep the crimp to a minimal roll crimp
 
The CamPro revolver bullets have a cannelure, and I crimp them well for tubular magazines and difficult to ingite powers. For autoloaders, you're just removing the bell.
 
B said:
True but campro are nearly 3x thicker than everyone else. They are to be treated like jacketed bullets. You would need an extremely heavy crimp to compromise the plating.
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Verify your belief over the chronograph and the target. You may be surprised at the difference, or it will confirm your belief.
After my own testing, I load both jacketed and plated bullets with the same method. I found little difference in consistency over the chrony, but a marked improvement in group size with a crimp that was essentially just removing the bell.

Magnum revolver ammo may well be a different animal due to slower powders, but most bullets meant for that use seem to have a built in crimp groove.
 
Canuck223 said:
Verify your belief over the chronograph and the target
Click to expand...

I chronograph many different combinations while developing loads, even for pistols. I typically put a modest taper crimp on all auto cartridges and load magnum revolver rounds to suit the powder and charge. Most often my target loads will have a light crimp to remove the flaring while the heavy stuff get a strong crimp. Nothing special about my method, just common sense and the ability to learn. None of that has much to do with what I said though. My point is just that campro bullets don't need to be babied like other brands. If he is crimping enough to cut the plating and make his bullets keyhole then that is an operator problem not a product problem.
 
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