Beautiful build! How much did the barrel weight come in at?
338 Mega
- Thread starter Idaho Trecker
- Start date
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I didn't weigh it, but if I had to guess it is in the 3 lb range.
That is based on the fact that the total weight is right around ten pounds and the stock is right around three of that. The scope and mounts are right at 2.
It also feels very similar to my 7-08AI build that has a 20" rem varmint profiled barrel that weighs about 3.5.
That is based on the fact that the total weight is right around ten pounds and the stock is right around three of that. The scope and mounts are right at 2.
It also feels very similar to my 7-08AI build that has a 20" rem varmint profiled barrel that weighs about 3.5.
Well, I finally had a chance to get it to the range and fireform that brass. The load did pretty well (68.3 grains of Vectan Tubal 7000, a Speer 200 grain SP seated way out to get some jam, and Wolf LRM primers). I was able to shoot out the one inch orange dot I had for an aiming point with about 30 rounds. The last 15 rounds I took it to the 300 yard line and went 14-15 on a 6" gong without dialing at all, just using the holdover hashes. I shot just over the top on the one I missed. I am confident that with the right load this gun will shoot.
I will say one thing. While that SRS brake makes the recoil a cake-walk, the muzzle blast is pretty heavy. Especially when you have the bullet baffles out in front of you. I think that until my suppressor gets out of jail, I will be shooting this one up at the property out in the open.
I will say one thing. While that SRS brake makes the recoil a cake-walk, the muzzle blast is pretty heavy. Especially when you have the bullet baffles out in front of you. I think that until my suppressor gets out of jail, I will be shooting this one up at the property out in the open.
elkaholic
Well-Known Member
good start. Keep us posted!
Tidesloe
Well-Known Member
Is this with the long reamer, and what is your freebore?
elkaholic
Well-Known Member
Great looking rifle!
The 338 bullets, as you mentioned, are vastly different in length. You have the LA FB which is designed for the heavies. For those wanting to shoot the 250 Berger and shorter bullrts, my .100" FB reamer is what you want.
Finally got my suppressor out of jail and my Manners shipped the week before, so mine is now in its final configuration.
Well, I was able to start in on load development today. I loaded up some 225 grain Accubonds as we have our annual Nilgai hunt coming up in Feb, so I would like to find a load for that hunt first. I started low and am working my way up. As you will see below, I still have some room to continue upwards.
Load specs are: ADG brass, fireformed only, Rem 9.5M primer, 3.160 COAL
Hybrid 100V
68.5 - 2694 fps, 14.5 SD
69.0 - 2711 fps, 13.3 SD
69.5 - 2739 fps, 7.4 SD
70.0 - 2776 fps, 9.6 SD
VV550
68.5 - 2775 fps, 7.0 SD
69.0 - 2780 fps, 7.5 SD
69.5 - 2801 fps, 7.0 SD
70.0 - 2827 fps, 9.5 SD
Load specs are: ADG brass, fireformed only, Rem 9.5M primer, 3.160 COAL
Hybrid 100V
68.5 - 2694 fps, 14.5 SD
69.0 - 2711 fps, 13.3 SD
69.5 - 2739 fps, 7.4 SD
70.0 - 2776 fps, 9.6 SD
VV550
68.5 - 2775 fps, 7.0 SD
69.0 - 2780 fps, 7.5 SD
69.5 - 2801 fps, 7.0 SD
70.0 - 2827 fps, 9.5 SD
What is your bbl length? Normal or long reamer?
Barrel length is 21.5", long reamer. Those 225 Accubonds are jumping around 0.090" when I have 2X diameter seating depth.
I have some 250-270 grain bullets that I will start working with as well.
Awesome, thanks! Just picked up the 250 NAB and want to start the load test. Did you have any pressure at 70.0?
None at all with either load. I am pretty sure I can go up a few more grains with both powders.
I decided that H100V wasn't going to give me the velocity I wanted before hitting pressure, so I continued upward with the VV550.
Here is what I shot today.
Load specs are: ADG brass (fireformed only), 225 grain Nosler ABs, Rem 9.5M primer, 3.160 COAL
VV550
70.5 - 2875 fps, 5.3 SD
71.0 - 2894 fps, 5.0 SD
71.5 - 2922 fps, 15.7 SD
72.0 - 2946 fps, 12.4 SD - slight bolt lift stiffness
Interestingly enough, the 71.5 5-shot group measured 0.640" and the 72.0 group measured 0.876". The other two groups were over an inch. I will load up a few more in the 71.5 range to shoot some more groups. If it continues to shoot those groups, I will use this load for my Nilgai hunt in Feb.
I also have some 250 grain Accubonds and some 250 grain Lapua Scenars that I will load some ladders for and see what happens with those as well.
Here is what I shot today.
Load specs are: ADG brass (fireformed only), 225 grain Nosler ABs, Rem 9.5M primer, 3.160 COAL
VV550
70.5 - 2875 fps, 5.3 SD
71.0 - 2894 fps, 5.0 SD
71.5 - 2922 fps, 15.7 SD
72.0 - 2946 fps, 12.4 SD - slight bolt lift stiffness
Interestingly enough, the 71.5 5-shot group measured 0.640" and the 72.0 group measured 0.876". The other two groups were over an inch. I will load up a few more in the 71.5 range to shoot some more groups. If it continues to shoot those groups, I will use this load for my Nilgai hunt in Feb.
I also have some 250 grain Accubonds and some 250 grain Lapua Scenars that I will load some ladders for and see what happens with those as well.
Tidesloe
Well-Known Member
What are you guys doing as far as fireforming, if anything at all. I'm experimenting with this round on fireforming brass before load development. What I'm seeing and did not expect is after one fireforming load, I'm having to bump shoulder back .006 for that brass to chamber with no resistance. Not sure if maybe growing in the web area is causing this, or what exactly is going on.
