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RN vs FP for accuracy

9696 Views 17 Replies 7 Participants Last post by  unclenick
Hey all,
Ive been searching this forum but cant find what I'm looking for.
I've always loaded some type of HP's in my .40 and .44 mag. for plinking/ practice. (Black Talons for home defence/ CCW.)
Anyway, I just recently became a member of Frontsight in Nevada and they require factory FMJ's when shooting at their ranges. I would like to duplicate a factory load with my reloads but before I do I was wondering if there is any noticable difference in the accuracy of FN vs RN slugs.

I've also had a terrible time finding bulk 155gr FMJ's of any kind at a reasonable price. I did finally find this:
But id be interested to know of any other similar suppliers.

I am also interested in .40 cal accuracy loads for other competitions where I can shoot ANY bullet I like. I've narrowed my powder down to 231, bullseye, and AA#5. The goal is to have an accurate round with minimal recoil to stay on target. I currently shoot a Glock 23 and Baretta 96F.

Thinking about getting a 1911 in .45 for these matches also.
Thanks for any help/ tips,
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Hard to say. In general, the shorter the bullet, the better it is stabilized by a given twist rate. An interesting example is the .32 HBWC. A test done with commercial loads of .32 S&W Long WC ammo (the International centerfire pistol standard round) found that faster twist than the standard 18 3/4" did better. Groups got tighter until about 12" twist, then they opened back up again when faster than that. You'd think the extra spin would throw the skirt out centrifugally, and the traditional spin shows being good enough on a twist calculator, but, the long bullet may need long range to go to sleep with the traditional twist rate, and the 12" would certainly make that happen a lot sooner.

All I can think with the Berry's, assuming their tests are valid, is that the greater bearing surface lets the bullet straighten itself better in the bore and perhaps even just tip less in a case when loaded? I know I have never been able to get 185 grain .45's to shoot quite as precisely as 200 grain bullets do. The little high speed 155 grain bullets I tried once proved impossible to get good grouping with. So, something's going on with short bearing surface. At least, I think that's what it is.


Check your range rules. Berry's bullets are plated, not jacketed, like commercial cartridges use. I assume airborne lead is their concern, and Berry's should be fine for that, but if they have some other reason the difference might matter to them.

In general, also note that plated bullets use lead bullet loads and not jacketed bullet loads. The plated copper is a good bit softer than the gilding metal jackets are made from, and they upset more easily at high pressure, which can cause the pressure of maximum jacketed bullet powder charges to go even higher and become excessive in some guns.
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You can still load the soft bullets pretty fast. Elmer Keith developed the .44 Magnum using 16:1 lead:tin cast alloy, which is probably softer than the plating on the Berry's, but harder than their swaged cores. The main thing is not to count on the same loads that are safe with jacketed bullets to be safe with the softer ones. You'll just have to work the load up while watching for pressure signs. You may end up with a different powder.

This outfit has .40 cal 155 grain FMJ's at about $130/1000.
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