5.7 Reload using Blue Dot

Reloading info for the 5.7x28mm

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panzermk2
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Re: 5.7 Reload using Blue Dot

Post by panzermk2 » 18 Mar 2021, 08:10

What you are running into is that powders behave differently at the limits of the parameters they where designed to work in.

Your powder is behaving normally and somewhat predictably when you are in the 40k and below pressures.
Once you exceed 40k and get into the region of 45k powders behave completely differently.
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Whiterabbit
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Re: 5.7 Reload using Blue Dot

Post by Whiterabbit » 21 Mar 2021, 21:34

Better results now:

Image

I pushed OAL longer. No pressure signs anywhere. I suspect 6.9 is a very comfortable margin from max. ctg looks a little goofy because lots of bearing surface is exposed, but the neck tension is huge. I made a dummy load and chambered/extracted it a bunch of times with no meaningful change to OAL. (the OAL drop per chambering is measured in low tenths)

The debate now is 6.9 vs 6.3. 6.9 was favorable for on-target precision, but it is hard to ignore an SD of 14 for 6.3, even when using instrumentation that injects a lot of inherent measurement variability (suggesting the real SD is lower, even substantially lower). Precision was not THAT far behind the 6.9, but definitely measurably worse. But if I am being honest, the worse grouping could be the shooter, not the load. (6.6 shot a big group, as did 6.0, so they are both out)

JHeckert1974
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Re: 5.7 Reload using Blue Dot

Post by JHeckert1974 » 22 Apr 2021, 08:14

shootinbuzzards wrote:
10 Sep 2014, 14:01
I shoot my FN quite often and readily do mostly reloads. I will share my recipes for as per your request of load data for bluedot. I have tried the minimum to maxload with this powder and came up with what I consider to be the best results for me.

The following loads are for 40-45 grain ( any make or brand of bullet with the exception of 218 Bee ammo) 218 Bee ammo is a short 40 grain HP and has some issue entering the chamber upon successive shots after the first. They will usually hang before getting to chamber. Does not always hang but does happen.

Case trim to length: 1.135
OAL: 40 grain 1.525
45 grain 1.575
Bluedot Min 5.8 gr, max 6.5, suggested load and what I use is 6 gr for all bullet types

newest Powder I have tried and like much better than the blue dot as I can shoot up to 55 gr FMJ quite well is : Accurate 7 using 6.5 gr --- min 6.2, max is like 7 gr but I will verify or you can find the load data in Lyman reload manual

I have just recently obtained some Vihtavuori N340 and will post results at a later time

Do you have a good recipe to start off with for 35 gr vmax with blue dot powder?

Whiterabbit
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Re: 5.7 Reload using Blue Dot

Post by Whiterabbit » 23 Apr 2021, 14:00

data shown in the chart there is bluedot and a 34 gr bullet.
Last edited by Whiterabbit on 26 Apr 2021, 08:19, edited 1 time in total.

JHeckert1974
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Re: 5.7 Reload using Blue Dot

Post by JHeckert1974 » 26 Apr 2021, 07:02

Thank you, I will start around the 6.3 range. The factory load i was shooting is AE and I pulled one of the bullets out and measured it, it is .025" longer than the 35 grain VMAX. So I was just going to subtract my measure OAL by .025" to seat the 35 gr VMAX. This will give me same seat depth and same volume in the shell as factory.

Whiterabbit
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Re: 5.7 Reload using Blue Dot

Post by Whiterabbit » 26 Apr 2021, 08:16

A warning reminder:

If you’re close to or over 7.0 AND run a short OAL, you will see heavy pressure signs.

I saw 0 pressure signs for 6.9 data above because I extended OAL. 6.9 had the tightest group on target. I consider it a max load for my bullet choice. Dropping OAL will likely push it over the top, just.

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