[kipkipkip]

I also am having crazy inconsistency in seating. I just started loading 6.8 last night. Here we go.

1. What is the minimum/maximum length of a cartridge? I am attempting to get a consistent 2.230 OAL
I am using RCBS full length dies. I now have about 15 bullets to pull. Lyman manual does not state
what a minimum length would be. A never go below.

2. I am just loading plinking rounds now. Sierra 6.8 115 grain match kings. RX10 starting at 23.2

3. New SSA brass, originally I didn't chamfer/debur, onces started seating got a little better, but not
what I would have expected. I've come to the conclusion that I can't load these progressively.

4. I did not resize the new brass.

Is this problem the dies? bullets? Do I need a better seating die? Or where is the minimum seating depth?



Thanks,
Kip

 

[paulosantos]

What mass are you using? If you have Barrett mags, load them to 2.245". That is the standard starting point for most bullets.
Also, what upper do you have? 23.2 GR of RE10X is very light and may cause short stroking issues. 26 GR is a better place to start.

On the SSA brass, check that the case mouths are perfectly round. I always run the sizing die halfway down on the new brass to ensure that they are round. You should also chamfer the inside of the brass.

 

[kipkipkip]

Bushmaster 10/1

Paulo, I also have bushmaster mags. I fired some of my reloads today, and they do seem to be pretty light in comparison to SSA Pro Hunters that I fired also. I am waiting on the Reamer to go to SPC II. Currently I am still at SAAMI.

I used the load data out of the Lyman manual. MIN/Max 21.8/ 24.2 RX10 Max OAL 2.230"

I'm thinking in a month or so I will start looking for a different upper.

I don't have a chrono yet, maybe you can suggest a starter model that gets the job done.

Thanks,
Kip

 

[paulosantos]

http://www.midwayusa.com/viewProduct/?productNumber=852429

That is the Chrono I've been using for almost 3 years. Works great. I got the remote with it.

Once you get that barrel converted, you could go up to 28GR of RE10X. Right now work your way up to 27 GR.

 

[kipkipkip]

Okay gotcha.

It seems everytime I read post from you, I get more questions. I hope you don't mind.
What are "Short stroking issues"?

Kip

 

[Fastowl]

For reference I have some issues lately with not resizing new SSA brass and having headspace issues. I now resize even the new stuff. After resizing the new brass and bumping the shoulder back the rounds seat in chamber fine (but not before).

As far as OAL Paulo would be a great go to guy. I have been seating my 110 gr BTHP's at 2.275 and no problem fitting in the mag or feeding issues.

 

[paulosantos]

Okay gotcha.

It seems everytime I read post from you, I get more questions. I hope you don't mind.
What are "Short stroking issues"?

Kip

No problem at all. Short stroking is when the AR doesn't have enough gas to cycle the upper. It is caused by a weak or underpowered load or if your buffer is too heavy. And it can also be caused by you gas port being too small.

 

[kipkipkip]

For reference I have some issues lately with not resizing new SSA brass and having headspace issues. I now resize even the new stuff. After resizing the new brass and bumping the shoulder back the rounds seat in chamber fine (but not before).

As far as OAL Paulo would be a great go to guy. I have been seating my 110 gr BTHP's at 2.275 and no problem fitting in the mag or feeding issues.

Yeah but Fastowl, Is your upper 1/10 SAMMI? I am wating for reamer to go to SPCII. Would it be a good idea for cartridge length to be 2.275 ins SAMMI?

Kip

 

[paulosantos]

Yeah but Fastowl, Is your upper 1/10 SAMMI? I am wating for reamer to go to SPCII. Would it be a good idea for cartridge length to be 2.275 ins SAMMI?

Kip

The SMK bullets are one of the few bullets that you cannot load too long. We had a chart with the recommended max but we took it down because of the different variables in chambers. I wouldn't load past 2.260" until you get the chamber converted. I'll check some when I get home tomorrow.

 

[Fastowl]

Mine are DMR chambers with 1:11 twist (ARP XT's) thanks to Harrison.

 

[EWP]

I load Nosler 110gr Accubonds to 2.285' in my DPMS SAMMI 1/10 chamber with the shoulders on once fired brass bumped back .004-5" with no problems or pressure signs.

I did have some slight swipes on some of the Hornady 110gr BTHP loads I had loaded short (2.245") with 28 Gr's of H322 but they went away on the ones I tested at 2.255".

I think I'm going to take them out to 2.285" as well because the accuracy on the Accubonds was great, but not so good on the shorter loaded BTHP and see if they do better.

Should I bump the charge up on the Nosler loaded at 2.285" to 28.5 Gr's and see if they do better since there are no pressure signs at 28 Gr's?