The 25 CM is awesome. The Blackjack 131 ACE is incredible. I have been shooting them over the past year and it has been a hammer. It only had one flaw that I could find. The recoil is on par with a 6.5 CM. Spotting shots off a barricade inside of 500 could be difficult. As I got to the end of the barrel I decided to attempt to address this by moving to a smaller powder load and a smaller case. I thought it through and looked at the 6GT. After crunching some numbers I thought about necking it up to take the Ace. I figured if I ran H4350 in a longer barrel the GT case would get the heavier projectile running around 2800 FPS.
Looking at what the 6GT guys were doing it looked like the Ace would run the same or better wind drift than the 6’s but with more drop. The additional benefit would be a cartiridge that was less overbore than the parent and in theory might extend barrel life.
My goals in making this cartridge are:
1. Less recoil
2. Good wind drift
3. Longer barrel life
I mocked up a case and ordered a reamer from Dave Manson Precision Reamers. They were very helpful and took great care of me in making the reamer and then working with me when I needed to regrind it to shorten the free bore.
To start the rifle specs are:
Impact Precision 737r
28” Bartlien heavy varmint 5R 1:7
Silencer Tech 30 cal suppressor
Trigger tech special
Skim bedded Bell & Carlson M5 stock
edited to add barrel twist
Looking at what the 6GT guys were doing it looked like the Ace would run the same or better wind drift than the 6’s but with more drop. The additional benefit would be a cartiridge that was less overbore than the parent and in theory might extend barrel life.
My goals in making this cartridge are:
1. Less recoil
2. Good wind drift
3. Longer barrel life
I mocked up a case and ordered a reamer from Dave Manson Precision Reamers. They were very helpful and took great care of me in making the reamer and then working with me when I needed to regrind it to shorten the free bore.
To start the rifle specs are:
Impact Precision 737r
28” Bartlien heavy varmint 5R 1:7
Silencer Tech 30 cal suppressor
Trigger tech special
Skim bedded Bell & Carlson M5 stock
edited to add barrel twist
Attachments
Last edited: