ALPHA OCD 6 DASHER TEST DATA

[SS GO DEVIL]

Just wanted to share some data that I finished testing on this past weekend. I had recently chambered a .236 bore 7.83 twist 4 groove heavy varmint @28'' muller works barrel with a .272 neck .104 free bore ptg reamer installed in a defiance deviant single shot cone bolt face action. During a recent match this barrel had a 70-80 fps increase in velocity shooting Berger 105vld target @ 32.2 Varget with br4 primers over the course of the match. Shots were #50 to #130 on the barrel, needless to say the impacts on paper were not horrible but also not impressive. In my past barrel 7.5 twist 4 groove .236 bore heavy varmint @27'' Krieger this load shoots 2960 fps with single digit SD. In my quest to finish out load development I loaded 50 pieces of the Alpha OCD @ 31.7 Varget with br4 primers @ .012 in the lands. This load shot extremely well at a local 300-400 match. Velocities were as follows (all loads were .012 jam in the lands)

32.2 varget= 3038 fps with 9 sd for 25 rounds
31.7 varget= 2968 fps with 3.4 sd for 50 rounds

So I am not sure if it was the brass having a different volume or the barrel but thought I would share if anyone else was running into the same issues. Also wanted to share some insight into mullerworks barrels and their quality. This barrel is extremely smooth when viewing it through a digital bore scope. I have read that mullerworks spends lots of time in the lapping process and it shows when looking at the barrel in a borescope and also when cleaning the rifle barrel.

 

[SS GO DEVIL]

Also forgot to mention that this brass is tough as nails and measures/weighs out impressive in the batches sent to me. The 2 batches I have weigh .5 grains from heaviest to lightest for those of you who pay attention to those types of data.

 

[Ranger188]

Was this a new barrel?
You posted shot #50-130
Some barrel will speed up (new) more than others until broke-in.
I had a .236 Rock Creek that was really fast once broke-in.
Every barrel will behave differently. Your previous load is just a reference
point for any new barrel.

 

[SS GO DEVIL]

Was this a new barrel?
You posted shot #50-130
Some barrel will speed up (new) more than others until broke-in.
I had a .236 Rock Creek that was really fast once broke-in.
Every barrel will behave differently. Your previous load is just a reference
point for any new barrel.

Yes, shots 1-49 were shooting what I consider normal velocity for this load (32.2 varget @ 2960). This barrel sped up and has seemed to settle in at a higher velocity. I will update after next 600 yard match after the barrel has another 80 shots on it.

 

[EEP]

You feel good with your powder charge weights and no static issues at the scale impacting those weights, same neck tension, same powder lot, bullet lot? I agree, that’s allot of speed to gain not considering any other variables other than barrel break in. Brass normally in same lot won’t do that at least in my limited experience.

 

[SS GO DEVIL]

All was good on the reloads. I anneal on an amp annealer and full length with .002 neck tension and shoulders bumped .002 every time. It sped up during the match then settled at the higher velocity even after a thorough cleaning and inspection with bore scope. Updates to follow after next long range match.

 

[SS GO DEVIL]

Update: I’ve figured out that every barrel is different. The Krieger shoots both brands of brass with 32.2 varget at speeds within 10fps. The mullerworks shoots 60 fps faster with Alpha. Both chambers were done with the exact headspace and reamer.