Poor Accuracy with X-Treme RNFP 180gr over Blue Dot

The_Shadow · February 08 2018 01:29:22 PM MST

High Desert Hunter, Welcome to the forum! Thanks for your report... ${$default_cool_smiley}$

High Desert Hunter · February 08 2018 06:16:49 PM MST

Thank you! I have been reloading and shooting an SR1911 in 10mm for 5 months now. Recently picked up an NOE 198gr mold with the HP pins and a GC. Look forward to learning from you all.

The_Shadow · February 08 2018 06:39:28 PM MST

There is plenty of info here especially in the pull-down sections... ${$default_grin_smiley}$

sparkyv · February 17 2018 07:34:49 AM MST

Quote from: sparkyv on January 27 2018 03:27:48 PM MST
Update: I received replacements and a small sampling mic'ed at 0.400". I hope X-Treme Bullets will provide the ballistics technician's findings on the questionable batch I sent back. Now to load these babies up and send them downrange!

Range report: the replacement projectiles functioned nominally. I must have previously received a bad batch that made it past QC. I've not yet heard back from X-Treme regarding the bad batch evaluation.

The_Shadow · February 17 2018 08:04:33 AM MST

sparkyv, by chance were you using the LEE Factory Crimp Die to finish your cartridges? If yes it is possible that the FCD squeezed the bullets smaller as loaded inside the casings. I have noted this using cast bullets, found the bullets would actually turn when twisted as finished. Pulled and measured they were squeezed smaller...
Needless to say I do not used the FCD to finish any of my cartridges for 10mm or 40S&W. However it makes a great pass through sizing die.

tommac919 · February 17 2018 01:57:25 PM MST

Quote from: sparkyv on February 17 2018 07:34:49 AM MST
Range report: the replacement projectiles functioned nominally. I must have previously received a bad batch that made it past QC. I've not yet heard back from X-Treme regarding the bad batch evaluation.

you mean normally ??

sparkyv · February 17 2018 06:17:43 PM MST

Quote from: tommac919 on February 17 2018 01:57:25 PM MST

you mean normally ??

Nominally, as in performing or achieved within expected limits. That term is used frequently in my line of work, and until I just looked it up, I did not realize that it is not a common form!

sparkyv · February 17 2018 06:25:38 PM MST

Quote from: The_Shadow on February 17 2018 08:04:33 AM MST
sparkyv, by chance were you using the LEE Factory Crimp Die to finish your cartridges? If yes it is possible that the FCD squeezed the bullets smaller as loaded inside the casings. I have noted this using cast bullets, found the bullets would actually turn when twisted as finished. Pulled and measured they were squeezed smaller...
Needless to say I do not used the FCD to finish any of my cartridges for 10mm or 40S&W. However it makes a great pass through sizing die.

Yes, I always use a FCD. I'm aware of using only minimal crimp with plated and cast bullets, and I have verified the amount of crimp on my pulled bullets. I used the same amount of crimp with the "questionable" lot as I did with the replacement lot. Therefore, I conclude that the FCD is not a factor in this case. Do you agree The_Shadow?

The_Shadow · February 17 2018 06:50:44 PM MST

I originally bought the LEE FCD as a finishing crimp die. After finding I could twist the bullet as they sat inside the finished round and started seeing some leading, it prompted met to pull and measure that they were squeezed smaller than 0.4015". With cast bullets, they are best when the retain their full diameters. That is why I discontinued the use of the FCD early on for that process.

That was my experience. No issues since I went back to the RCBS taper crimp die to finish my cartridges.