Load recipe? Shooters World Precision, 223 Rem, 55 gr

[Jeff Patton]

I was able to get some Shooters World Precision and the bottle shows a 223 Rem load recipe for for 77 gr bullets, but I'm looking for a recipe for 55gr bullets. Has anyone developed a load for that combination? thx
Jeff

 

[cptjack]

download their load data

 

[Retired Grunt]

Get Gordon's Reloading Tool, It provides excellent results for your loads and it's free.

 

[Laurie]

Yes as @cptjack says, download their data. To help you:

https://shootersworldpowder.com/wp-content/uploads/shooters-world-manual.pdf

page 40 et seq. There are some 5.56 loads shown including two 55s and they confirm what I've had suggested otherwise - SW Precision Rifle (Lovex SO62 as we know it in Europe) is really a bit too slow burning for 55gn bullets in the cartridge. Max load is 26gn, compressed (and some!!) for a low MV. Basically, you won't be able to overload this combination.

Although SO62/Precision Rifle is shown in burn rate charts on the same line as VarGet, IME with 77s, it's significantly slower burning than the Hodgdon powder in this application.

 

[Jeff Patton]

Thanks, guys, very helpful. I thought I'd scoured the net but I'd missed that document.

A follow-up question, however - the table lists 223 loads for 60 - 77 grain bullets, but not down to 55gr. The 55's are listed in the 556 section, hence my question - 556 is designed for higher pressure than 223, so one could expect that the 55gr loads listed in the 556 section may be intended to produce 556-level pressures.

I'm loading plinkers for use in a 223 Wylde, to be used to introduce friends to shooting at the range, rather than for more precise uses. I want to be certain I stay within 223 pressure levels and since the 55gr loads are listed in the 556 section, is there a risk that these loads will produce pressure levels in excess of the 223 Wylde design pressure level?

This has been a little frustrating - I bought the Shooter's World Precision for this purpose when I found it available (and nothing else was!), believing various posts that it was interchangeable with Varget, but now I'm having a lot of trouble finding a safe load range for this powder with this bullet.

 

[Clark]

I did a work up in 223 with H335 and 55 gr bullets.
I measured each extractor groove diameter before and after firing.

Vernon Speer wrote in 1956 that he developed loads by working up to brass change, and then backed off 6% powder charge.

 

[karrarararararar]

Thanks, guys, very helpful. I thought I'd scoured the net but I'd missed that document.

A follow-up question, however - the table lists 223 loads for 60 - 77 grain bullets, but not down to 55gr. The 55's are listed in the 556 section, hence my question - 556 is designed for higher pressure than 223, so one could expect that the 55gr loads listed in the 556 section may be intended to produce 556-level pressures.

I'm loading plinkers for use in a 223 Wylde, to be used to introduce friends to shooting at the range, rather than for more precise uses. I want to be certain I stay within 223 pressure levels and since the 55gr loads are listed in the 556 section, is there a risk that these loads will produce pressure levels in excess of the 223 Wylde design pressure level?

This has been a little frustrating - I bought the Shooter's World Precision for this purpose when I found it available (and nothing else was!), believing various posts that it was interchangeable with Varget, but now I'm having a lot of trouble finding a safe load range for this powder with this bullet.

Load away, 223 wylde is designed for 5.56 pressures.

 

[Laurie]

Load away, 223 wylde is designed for 5.56 pressures.

Yep, Wylde is largely a modified 5.56 chamber to improve precision. But you won't hit NATO 62,000 psi pressures anyway, or anywhere near this level, with this powder and 55s - unless you're running some really heavy and low capacity brass.

There is some very interesting stuff here on 223 Rem SAAMI v Wylde v 5.56 chambers and ammunition standards / actual pressures / pressure measurement method variations:

https://www.luckygunner.com/labs/5-56-vs-223/

 

[jelenko]

Vernon Speer wrote in 1956 that he developed loads by working up to brass change, and then backed off 6% powder charge.

How does that get you an accurate load?

 

[Jeff Patton]

I appreciate all the replies, this is a great forum. I'm going to go load.

 

[Clark]

How does that get you an accurate load?

I have never found one load more accurate than another.
I bought this rifle [of the above work up] mail order used. I cleaned it and shot it with mixed brass and blemished 33 gr bullets at 100 yards. It is good enough for ground squirrels.