9mm bullets - round nose FMJ vs Truncated Cone FMJ


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Owen
February 14, 2011, 07:44 PM
I am prepping for the next season of USPSA.

I shoot a Glock 17 with a factory barrel in Production. My current load is 3.3gr TiteGroup, with a 147gr Precision Delta FMJ-RN, which is running about 127 PF.

I'm preparing to order 6k bullets or so, but just found out PD is out of the FMJ-RN until the end of March, but they do have FMJ-TC in stock.

What are the pros and cons of a TC over a RN? I'm pretty happy with the RN load I have now, but I also want to have my reloading for the season done by the end of March. Should I just be patient?

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noylj
February 14, 2011, 08:54 PM
I prefer TC to RN, but then I prefer SWC to TC.
I certainly wouldn't buy 6k without testing them.
Maybe you can find 100 similar TCs locally?

Owen
February 14, 2011, 09:19 PM
well I like the precision delta price, but they have a 2k minimum order.

Marlin 45 carbine
February 14, 2011, 09:27 PM
I don't shoot competition but the fp's I've loaded 'whack' informal shooting steel discs with better results over the rn's I've loaded.
I'm wondering if a good deal of this is due to the contact around the edge of the disc myself.

1SOW
February 14, 2011, 09:55 PM
Owen: A little close on the PF?

The PD fmj has a normal ogive. This PD TC won't really have an ogive. It will be straight to where the cone starts and then straight to the FP.

I have a tight chambered CZ, so conical and flat point bullets have to loaded pretty short in my gun; but with your Glock it should be fine, but you may have to shorten your current oal.

Easy for me to say, but I'd wait for the known good performers, or order the minimum to try them out.

Owen
February 14, 2011, 10:03 PM
yeah, it's real close on the PF. I chrono'd on a 50 degree day, so as long as its warmer, I should be ok.

Seedtick
February 15, 2011, 12:15 AM
well I like the precision delta price, but they have a 2k minimum order.

Hey owen, If I'm not mistaken you can order just 1K. Somewhere during check-out there was a note to add $5? for a 1K order. You can even order a sample size, 100, if you want. I don't know if they have them listed online yet but they also have hollow points in 9mm.

Give em a call, they have answered pretty quick every time I've called.

Seedtick

:)

918v
February 15, 2011, 01:53 AM
TC has to be seated shorter, so you will have to rework the load.

1SOW
February 15, 2011, 10:38 PM
I have a similar problem with my favorites---Zero 125gr JHP. They rotate production to just one or two types of bullets for months at a time. I have waited for 6 mos once.

Zero may be the second cheapest for your 147---I haven't checked. . My 125gr JHP Zeros are cheaper to the door than MG 124 JHPs.

bds
February 15, 2011, 10:58 PM
owen, this thread (http://www.brianenos.com/forums/index.php?showtopic=105488) may help in your bullet selection. Looks like the 147 gr FMJ TC is favored.

GLOOB
February 16, 2011, 03:11 PM
TC has to be seated shorter, so you will have to rework the load.
You don't have to change the internal case volume. In fact you can increase it a bit, if you have enough freebore. And you probably do with the GLOCK.

BigBob3006
February 19, 2011, 07:49 PM
Owen,

The truncated cone is a much more efficient bullet for transferring energy to a person or animal and feeds as well as the round nose. It has been gaining favor with the bulls eye shooters. You might want to take a look at the Hornady HP-XTP. This is a very accurate bullet and solves the desire for a bullet that will do it all.

Owen
February 19, 2011, 08:09 PM
BigBob,

For my application, I really don't care about transferring energy to anything but a piece of cardboard or steel. I care about two things, decent accuracy, and dirt cheap cost.

The XTP fails on the cost point.

918v
February 20, 2011, 01:03 AM
You don't have to change the internal case volume. In fact you can increase it a bit, if you have enough freebore. And you probably do with the GLOCK.

You cannot seat a TC to the same OAL as a RN in a Glock magazine, even if it chambers.

noylj
February 20, 2011, 06:16 PM
You should be looking at cast lead bullets, moly-kote bullets from Precision or Black Bullets International, plated bullets, or very large orders of jacketed bullets from Precision Delta, Roze Distributor, or Montana Gold.

Owen
February 20, 2011, 06:45 PM
Noylj,

Cast lead is out, as are the black bullets: I'm shooting a Glock with a factory barrel. The black bullets lead like crazy for me.

I haven't looked at Roze, but PD is significantly less expensive than MG.

GLOOB
February 21, 2011, 12:05 AM
You cannot seat a TC to the same OAL as a RN in a Glock magazine, even if it chambers.
I said case volume. Pressure/velocity are affected by internal case volume and distance off the rifling. Who cares if the OAL is different?

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