Possible to Interchange RN for RNFP?

[painter]

I'm not sure why that bullet is called a RNFP. It looks like a RN to me.

I'd be inclined to reduce my starting load by .2 grains, as well as max load, and load either of those powders at your #2 OAL. The 1.070 wouldn't be drastically different. .005 is not very much, and won't cause an issue at starting load.

Mr. W and ID will be by with their thoughts.

[Scarlett Pistol]

I'm not sure why that bullet is called a RNFP. It looks like a RN to me.

Right? When I picked them up I had to do a double take because they looked like a RN bullet. That tip is just ever so slightly flat. I don't think it is enough to make any difference, but the big difference seems to be in how acute the curve is and where the ogive starts, hence is making it have an OAL that is so different from the other RN bullets. Thanks!

[1SOW]

1.125 / 2.9grs equals  1.075 / #.# grs will give you a rough equivalent/cautious  starting load.

[painter]

1.125 / 2.9grs equals  1.075 / #.# grs will give you a rough equivalent/cautious  starting load.

That's how I got the .2gr reduction.

[Wobbly]

Ugh, I've wasted everyone's time and effort. Sorry comrades!

Just wait 'til you get my bill !!

I don't suppose you can pay me in 2016 so I can get that taxed with my charity work ??!!

 

[Scarlett Pistol]

Ugh, I've wasted everyone's time and effort. Sorry comrades!

Just wait 'til you get my bill !!

I don't suppose you can pay me in 2016 so I can get that taxed with my charity work ??!!

 

This is a complex subject... Materials science, fluid dynamics, all sorts of engineering and physics. Engineering consultants probably have good rates! I'll sign off on a good solid chunk of donated time for 2016 write offs for charity.   

[painter]

Ugh, I've wasted everyone's time and effort. Sorry comrades!

Just wait 'til you get my bill !!

I don't suppose you can pay me in 2016 so I can get that taxed with my charity work ??!!

 

This is a complex subject... Materials science, fluid dynamics, all sorts of engineering and physics. Engineering consultants probably have good rates! I'll sign off on a good solid chunk of donated time for 2016 write offs for charity.   

Physics?

I'm out...

Happy New Year all.

[Wobbly]

When I picked them up I had to do a double take because they looked like a RN bullet. That tip is just ever so slightly flat. I don't think it is enough to make any difference, but the big difference seems to be in how acute the curve is and where the ogive starts, hence is making it have an OAL that is so different from the other RN bullets.

Look again. The ogive is steeper; the nose is fatter. If it were only the lopped off area causing the issue, then the Push Test would show it loading at 1.13x". In this case, the flat tip is exacerbating the effect of the fat curve. The 2 shapes work together to both reduce the OAL, but it's the fat shape of the nose that's pushing the bullet to deeper seating depths.

If you can't see the "fat-ness", then open your caliper to 0.20" and lock it in place. Stick the ogive of each bullet into the caliper and rotate it to leave a score mark on the nose. You'll see that the score mark is much higher on the red bullet than the bullet next to it in photo in post #29.

 

[1SOW]

Physics is the result of too.many Mexican Boracho Beans.
How much "BoraaaCHO!" Is generated by one can of beans in a two quart belly, when you know the amount of gas in 1 quart belly ?
Logic with a little high school algebra  "usually" works ...........but not always

[painter]

Physics is the result of too.many Mexican Boracho Beans.
How much "BoraaaCHO!" Is generated by one can of beans in a two quart belly, when you know the amount of gas in 1 quart belly ?
Logic with a little high school algebra  "usually" works ...........but not always

Exactly.

[IDescribe]

With the 700x, which is mighty fast, I'd be asking myself why I'm bothering to load this bullet with 700X at all, and if I tricked myself into thinking there was a reason, I'd knock .2 off the top and bottom of the window. 

Seriously, unless you have a compelling reason to do so, why load a high pressure cartridge like 9mm with a super fast burning powder to begin with?

As to the BE-86, that is slow burning enough that I would trust starting load to protect me.  Your seating depth isn't crazy deep.

[copemech]

Those are for 38 Special or something, give them to someone that uses them and find a better bullet for your needs. Life is too short to use crap bullets just because they are cheap. Too many better options. Same for powders.

[Scarlett Pistol]

Well... These arguments and the issue of so many different bullet shapes for lead and coated bullets is making me want to not use coated bullets at all. All the lead bullet data in my reloading book is for bullets with the cut out around the bullet for lube, but then coated bullets usually don't have that. Shapes and lengths are different and now I don't feel like I'll have reliable load data. What a frustrating waste of time.

[painter]

For a brand new reloader it certainly is easier to use the exact components listed, but every brand of bullet is shaped differently.  That's part of reloading. It doesn't mean that the data is worthless. It means you need to be conscious of what you're doing, and make the necessary adjustments.

ID gave you a hint in his last post. Load them up with the BE-86. I, personally, would knock a couple of tenths off the starting and max loads specially if you don't have a chrono.

I forget...do you have a chronograph?

[Scarlett Pistol]

For a brand new reloader it certainly is easier to use the exact components listed, but every brand of bullet is shaped differently.  That's part of reloading. It doesn't mean that the data is worthless. It means you need to be conscious of what you're doing, and make the necessary adjustments.

ID gave you a hint in his last post. Load them up with the BE-86. I, personally, would knock a couple of tenths off the starting and max loads specially if you don't have a chrono.

I forget...do you have a chronograph?

No chronograph, but I may be needing one if I want to try using coated bullets.

With the 700x, which is mighty fast, I'd be asking myself why I'm bothering to load this bullet with 700X at all, and if I tricked myself into thinking there was a reason, I'd knock .2 off the top and bottom of the window. 

Seriously, unless you have a compelling reason to do so, why load a high pressure cartridge like 9mm with a super fast burning powder to begin with?

As to the BE-86, that is slow burning enough that I would trust starting load to protect me.  Your seating depth isn't crazy deep.

Wish I could of sold my 700-X... Couldn't find anyone to buy it when I posted it locally. Lots of people seem to like Tight Group or other powders that a pretty fast (not as fast as 700 - X), would I need to avoid those powders too with this shortened load? Or is it just that your point was 700-X is just too fast in general for 9mm?

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