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Discussion Starter · #1 · (Edited)
Howdy,

I have a Spikes 6.8 spcii barrel in 10.5and a Banish 30 can.

I was attempting to adjust my gas block. I opened to full bore and the handloads were causing short stroking and improper cycling.

I am new to loading for the SPC II chamber and I know that I need a hotter load.

Current load is 28gr of AA2200, Barnes 95gr TTSX, and WSR primer, coal of 2.285.

Western powders max at 30.2 or 30.4 gr (from memory) and I believe that is for the SPC chamber.

Has anyone gone above 30 grains for SPC II?

TC
 

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Discussion Starter · #5 ·
Range report: I changed my load by increasing it to 29gr. The rifle was still undergassed. In route to lunch, it hit me: Gemtech suppressed bcg was bleeding out too much gas. I removed the Gemtech and swapped to a milspec BCG. Problem solved!

Spikes SPC II, 10.5, Banish 30 can.
87 degrees
67% humidity
29.88 pressure

Barnes 95grTTSX
29gr AA2200
WSR - Hornady brass
Col 2.285”

3 shot group at 50 yds = 3/8” group.
 

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Range report: I changed my load by increasing it to 29gr. The rifle was still undergassed. In route to lunch, it hit me: Gemtech suppressed bcg was bleeding out too much gas. I removed the Gemtech and swapped to a milspec BCG. Problem solved!

Spikes SPC II, 10.5, Banish 30 can.
87 degrees
67% humidity
29.88 pressure

Barnes 95grTTSX
29gr AA2200
WSR - Hornady brass
Col 2.285”

3 shot group at 50 yds = 3/8” group.
 

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Good afternoon guys, quick question. Are you all loading Thea rounds long? If so how are they fitting in the magazine? All of my 6.8 spc mags are Barrett 6.8 mags and my rounds are at 2.260 coal. Please advise
 

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Discussion Starter · #8 ·
Capo: I load for the SPC II at a coal of 2.285.” I can load out to 2.300” but my mags do not like it. PRI and ASC allow you to use a longer coal.

Many 6.8 mags are better for 2.240 and 2.260.

I am fairly new to reloading for the SPC II. I started using 2.285” around 2018/2019. I started reloading for the SPC in 2012.

TC
 

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I'm setting up a 95GR TTSX aswell but i'm using H322 from an 11.3"BBL. At 31.0 grains i'm getting 2675 FPS.

I thought about going to A2200 but according to QL it's only in the 80% range for burn rate, H322 is above 90% and I've tried to consolidate alot of my reloading to H322 so that works for me.

I did have to open up my gas block a touch to get these to cycle.
 

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Here is SPC load data for AA2200. In cooler weather I can load about 0.3 grains higher, but everyone's rifle and components are different.

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H322 is temperature insensitive but worked the best for me with 110gr bullets, e.g., no shift in POI at 200 yards if a hot or cold day. Lighter bullets, 100 and below, velocities would be slightly faster in colder temps and POI would shift up to 5" at 200 yards. AA2200 has mild temperature sensitivity, but I have never found H322 to be able to compete with AA2200 for MV even when I use a drop tube to get as much 322 into the case as possible. Check the Hodgdon data, compressed H322 loads barely get above 53k psi where 58K is max SAAMI chamber pressure. You can't get enough H322 to be overpressure in the 6.8 for the bullets Hodgdon lists.


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H322 is temperature insensitive but worked the best for me with 110gr bullets, e.g., no shift in POI at 200 yards if a hot or cold day. Lighter bullets, 100 and below, velocities would be slightly faster in colder temps and POI would shift up to 5" at 200 yards. AA2200 has mild temperature sensitivity, but I have never found H322 to be able to compete with AA2200 for MV even when I use a drop tube to get as much 322 into the case as possible. Check the Hodgdon data, compressed H322 loads barely get above 53k psi where 58K is max SAAMI chamber pressure. You can't get enough H322 to be overpressure in the 6.8 for the bullets Hodgdon lists.
Good info on the chamber pressure with H322, i'll have to try out some AA2200.
 
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