300 Norma Improved 35 degree

[Ledd Slinger]

I guess I should rephrase that. I found the Piercision brake much more pleasant as it has no noticeable muzzle blast towards the shooter. The beast is more effective at straight up recoil reduction though. I just thought that it had too much concussion for the shooter. My rifle came out at about 9.5lbs and is a dream to shoot with Ryan’s break.

Very true on the concussion. The Beast really throws it right back at ya! Hate it when I forget to close the lid on my ammo box shooting prone. The blast fills it full of dirt, sticks, and grass. Lol.

And while the Beast brake is very effective, the rearward concussion is a big reason why I started searching and finally found something different that had a similar design for recoil reduction, yet less concussion and at a price that was reasonable like the mbm brakes. The Terminator brakes are supposed to give great recoil reduction and not have excessive muzzle blast back at the shooter but it’s hard for me to pay those high prices when I know there’s no extra work that goes into them than any other good brake. And now knowing how effective the $35 brake is that I purchased from “Tactics” on eBay, I’ll probably never try a Terminator.

Tactics on eBay also makes a style that basically mimics the Terminator brakes if that’s the look you’re going for (see photos of listings below). I drilled the bore on the brake, timed it on my 338 rifle so it doesn’t use the nut or crush washer, and bead blasted it. But of course a person could use them as they come if they want.

I think this is a great piece of discussion to add to this thread because a good brake is very important on the 300 NMI as well as other big rounds.

 

[Dm6]

I have been very pleased with more than a few eBay brakes but I may have to get one or two of those to try as well. I can try them all for less than the price of a terminator.

 

[nakneker]

I tried the terminator on my 338 Lapua a few years ago after watching the inventor on YouTube where he compared it to many other brakes. Looked good, so I tried it. Couldn’t be happier, my wife and daughters shoot that rifle without issue. Im using another terminator on 300 NMI being built now by Alex, hopefully it does just as good a job. That being said they are expensive. That Ebay brake looks a lot like it, I’m gonna watch this and look for future comments/feedback. Interesting.

 

[Alex Wheeler]

So, I went down this road a couple years ago. Looking for a brake with less concussion but still effective. I kind of ended up where I started. I do not like jumpy rifles. I want to spot my impacts without loading the rifle on its bi pod. You can dig your bipod feet into the dirt and load the rifle hard and make any brake work at the range, but I have never had the opportunity to do that when hunting. Normally its a less than ideal position your in. I did ask Nathan at MBM to make a brake with 90 degree ports but keep his radiused port design. Mostly so they will be legal in Benchrest but also for a more pleasant brake on hunting rifles. Hes busy and so am I so its still a work in progress, but if one of you guys wants to test it vs some other brakes I can fit it for you. So far in Br its worked well, just have not got to the hunting side of it yet.

 

[Ledd Slinger]

For anyone wanting wanting to try 300 Norma ADG brass, I picked up 100 pieces for testing on my next 300 NMI build. Currently have Lapua brass.

The 300 Norma ADG brass consistency is phenomenal as it is in my 300 PRC and 6.5 SAUM cases from ADG.

The neck thickness on virgin cases is identical to the neck thickness on virgin Lapua cases which is .015” +/- .0005”

Case length on ADG is a little longer at 2.484”-2.486” vs Lapua cases which run at 2.481”-2.483”

Shoulder diameters are the same between ADG and Lapua at .559”

At the .200” line, ADG brass measures .5825” then carries that back to a diameter of .583” at the base of the body.
Lapua measures .5785” at the .200” line then .5825” at the base.
So ADG does a nice job of carrying a uniform diameter from the 200 line back which is something I like to see.

Didn’t check case H2O volume since in this thread we are improving the rounds and a few fps here or there probably won’t matter as long as the volumes are consistent for accuracy.

Hope this helps anyone who was wondering how the ADG brass would match up to their dies and chambers.

 

[Alex Wheeler]

I'll be forming some 338 lapua ADG in my 338 Lapua improved soon. Its supposed to have a little more capacity than Lapua and I will bet it will take more pressure too. Im sure you'll like the ADG in the Norma. If I was not stocked up on Lapua Id go ADG as well.

 

[tom]

I got back on the bullet shredder project today. Never hit pressure, so probably will fool with neck tension right around 91.5. 245 bergers, v570

 

[Bodhisafa]

I got back on the bullet shredder project today. Never hit pressure, so probably will fool with neck tension right around 91.5. 245 bergers, v570

View attachment 1276327

View attachment 1276328

Specs on the build?

 

[tom]

Specs on the build?

It's back a bit in this thread somewhere, but it's a 34" brux 8" twist 1.450" barrel. The platform is my Lawton 8000 right bolt, left port, right eject, that is glued and screwed in the cerus stock. The platform has performed very well with the 338 lapua improved barrel it started with. IOR terminator with 1/8 moa clicks sitting on top. Alex's reamer, I forget the free bore, but it handles 250 a tips above the bushing line so it's out there.

Tom

 

[tom]

 

[Ledd Slinger]

Using that .336” bushing, you should run a seating ladder with the 245s somewhere between .080” to .120” jump.

I know that sounds odd for what we normally test with Berger bullets, but I’ve had really good luck in a couple cartridges (7mm and 338) jumping them a long ways out to .120”. And now I’ve been reading where some people are finding that the longer seating jump range is much more forgiving in ladder testing than the shorter .040” to .000” (touch) range.

 

[tom]

Using that .006” neck tension, You should run a seating ladder with the 245s at .080” to .120” jump or so.

I know that sounds odd for what we normally test with Berger bullets, but I’ve had really good luck in a couple cartridges (7mm and 338) jumping them a long ways out to .120”. And now I’ve been reading where some people are finding that the longer seating jump range is much more forgiving in ladder testing than the shorter .040” to .000” (touch) range.

The .336 was giving me about .0013 tension. I've played with longer jumps, and what I typically see is a more forgiving/bigger window for sure. The smallest groups however still live in the smaller windows either/both sides of touch. Or at least in the barrels I've tuned anyways. It will be something else if this is repeatable, 245s north of 3150 should give my 338s a run for their money.

Tom

 

[Ledd Slinger]

The .336 was giving me about .0013 tension. I've played with longer jumps, and what I typically see is a more forgiving/bigger window for sure. The smallest groups however still live in the smaller windows either/both sides of touch. Or at least in the barrels I've tuned anyways. It will be something else if this is repeatable, 245s north of 3150 should give my 338s a run for their money.

Tom

If anyone will be able to keep a rifle in tune to rip off 5 shot groups like that consistently, you’re definitely the guy for the job

 

[tom]

Went out yesterday and noted about a 20 fps speed up, but she hung in there.



I followed up with some 5 shot groups and was a bit let down, but the 10 off was best. Got 140 rounds on the brux now. And .006" movement on my touch number since new, yikes!

Tom

 

[Ledd Slinger]

Interesting the 245 is liking a jam. Looks really consistent there. I have good luck in 6.5 with the 140s jammed.

Haven’t tested the 220s jammed yet but might have to give it a go. Current load is shooting -.015” off touch. Accuracy was plenty good enough for hunting last year but definitely has room for improvement.
I loaded a couple ladders with 3 shot groups set up for 92gr, 92.3gr and 92.6gr of N570. One ladder with -.020” and the other at -.025”. If that doesn’t pan out then I might try a jam.

Last time I checked 220gr speeds with these charge weights, 92.3gr gave an average of 3184 fps and 92.6gr averaged 3197 fps both -.015” off. But I think the barrel has sped up a bit since then so might get a little better numbers this time around.

 

[Nude nut]

I got back on the bullet shredder project today. Never hit pressure, so probably will fool with neck tension right around 91.5. 245 bergers, v570

View attachment 1276327

View attachment 1276328

Could you give me an honest opinion off the ior terminator I was considering purchasing one.
You can private msg me ifyou like.

Cheers Trev.

 

[tom]

Could you give me an honest opinion off the ior terminator I was considering purchasing one.
You can private msg me ifyou like.

Cheers Trev.

Pretty awesome when kept around 36x and under, and mechanically solid. Like every scope I've handled since the industry tried bigger than about 3.5 multipliers, it struggles at the top end.

Tom

 

[Nude nut]

Pretty awesome when kept around 36x and under, and mechanically solid. Like every scope I've handled since the industry tried bigger than about 3.5 multipliers, it struggles at the top end.

Tom

Thanks Tom.

Cheers Trev.

 

[X-Caveman]

26” Proof 9 twist, suppressed.

91.5gr N570
230 A-Tip @ .02” off lands
CCI 250

Went to a new range where I had to get zeroed at 100 then qualify on steel by making first shot hits at 400,500,600 & 700. Labradar on zeroing shots:

3,074
3,082
3,078
3,079

Qualified no problem, walked it out to 1,500 no problem. Left me 3 rounds for 1,750. 3 hits on 1 MOA steel square with 49.25 min from 100 zero, holding 3 min into a 7 o’clock wind. I’m impressed. Thanks Alex!

 

[h24]

Posted this on the 300 Norma Imp thread also, but I was curious on how wide your nodes were, and with which powder? I am seeing approx. .3gr on the low node and appox. .6 on the high node. Rl 50 powder. Seems a little narrow. What are you guys seeing?