I decided to start playing around again with my Abolt II medallion 7mag with Boss system. I picked up some 162 ELD-M and H-1000. I have 100 or so R-P brass and just waiting on my primers to come in. Started taking measurements on mag length, COAL, CBTO, etc.
162 ELD-M
3.425" COAL
2.727" CBTO
The browning mag has a max COAL length of 3.390", but can be modified. I ran across another forum where a guy was loading for his original abolt in 300 wm and the newer berger bullets wouldn't fit the mag, however when single fed, drove tacks. So he did this simple modification with a chainsaw file.
This is a pic of my mag with a factory 162 ELD-X Hornady Precision Hunter with a COAL of 3.283"
This is a pick of the modified mag for his 300 wm using 215 berger. Has put about 150 rounds through it with out a problem.
He didn't have a pic of the 215 berger but here is one with 160 AB. You get the idea though.
So, I decided to do a max measurement of my mag.
3.714" from the base to the end of the plastic. Basically file out all the plastic and leave just the metal housing. The plastic could be completely removed but it you notice, they have side ramps that hit the shoulder to keep the round in place. This prevents the round from sliding forward and damaging the tips.
3.714" Max mag length.
3.425" is the max COAL for the 162 ELD-M which would leave me about 1/4" of plastic still to play with.
Question 1, Do these 162 match rounds like jam, .010", .020", lots of jump?
Question 2, In my head, this "should" work. My plan was to start at .010" since my mag allows me to, work up to pressure to try and get max velocity, then use my Boss, which is basically a barrel tuner to tighten my groups. In doing this, I should achieve good velocities as well as groups.
Is my line of thinking correct?
I was going to do this with my Tikka t3 7 mag, but magazine restriction kinda killed that and they both have the same barrel length twist rate of 9-1/2. The Abolt is 24" barrel with additional 3" of boss. So this was a no brainer for me.
162 ELD-M
3.425" COAL
2.727" CBTO
The browning mag has a max COAL length of 3.390", but can be modified. I ran across another forum where a guy was loading for his original abolt in 300 wm and the newer berger bullets wouldn't fit the mag, however when single fed, drove tacks. So he did this simple modification with a chainsaw file.
This is a pic of my mag with a factory 162 ELD-X Hornady Precision Hunter with a COAL of 3.283"
This is a pick of the modified mag for his 300 wm using 215 berger. Has put about 150 rounds through it with out a problem.
He didn't have a pic of the 215 berger but here is one with 160 AB. You get the idea though.
So, I decided to do a max measurement of my mag.
3.714" from the base to the end of the plastic. Basically file out all the plastic and leave just the metal housing. The plastic could be completely removed but it you notice, they have side ramps that hit the shoulder to keep the round in place. This prevents the round from sliding forward and damaging the tips.
3.714" Max mag length.
3.425" is the max COAL for the 162 ELD-M which would leave me about 1/4" of plastic still to play with.
Question 1, Do these 162 match rounds like jam, .010", .020", lots of jump?
Question 2, In my head, this "should" work. My plan was to start at .010" since my mag allows me to, work up to pressure to try and get max velocity, then use my Boss, which is basically a barrel tuner to tighten my groups. In doing this, I should achieve good velocities as well as groups.
Is my line of thinking correct?
I was going to do this with my Tikka t3 7 mag, but magazine restriction kinda killed that and they both have the same barrel length twist rate of 9-1/2. The Abolt is 24" barrel with additional 3" of boss. So this was a no brainer for me.
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