Introducing the 300 Tyrant

[Tumbleweed]

I’m looking at a tikka 22” build and have been annoyed that the 300 prs is too long. This looks like the ticket! Keep us updated on the progress. I’m looking at shooting 212 eldx for long range elk so I’m guessing it would require a different reamer with a shorter throat than the one you used?

You certainly could run it with this freebore but you'd be jumping quite a ways...which isn't necessarily a bad thing. Optimized length for the 212 though is probably gonna be .050" shorter freebore. I'd have to look at notes when I get home


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[Tumbleweed]

I’m looking at a tikka 22” build and have been annoyed that the 300 prs is too long. This looks like the ticket! Keep us updated on the progress. I’m looking at shooting 212 eldx for long range elk so I’m guessing it would require a different reamer with a shorter throat than the one you used?

After checking my notes...required freebore for the 215 Berger is around .150" and for the 210 VLD about .215" with both of those bullets in optimal position in the neck. I would think the 212 ELDX would be somewhere in between the two. I did leave the longer neck on this cartridge which would allow a guy to really get the boat tail up high in the neck if needed. Depends on what your OAL restrictions are. Could be a reamer adjustment or just jump them a bit farther

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[Woodsman44]

Great - thanks!

 

[Tumbleweed]

Hi all! Hope you've had a great Thanksgiving with your families. All the hunting is done around here and I got a chance to go do some real load development with this thing today. Thought I would give a quick update!

I got an 8lb jug of Retumbo and loaded up 21 rounds for a seating depth test at a very low charge. I've done seating first for a lot of years with good results. I've found best seating doesn't change much, if at all...once you move up to powder testing. I tested .015" jump through .045" in .005" increments shooting 3 shots each

The worst group was MOA at .015" and the rest averaged about .6MOA. The winner was .040" as I suspected. Note that there is a fouler shot low left next to this group. I moved the scope after this and started the test at .015". That bullet is not part of the .040" group...should have used a different point of aimThis is the third, 30 cal Magnum I've loaded the 225's and they all wanted to be close to .040" jump.

Next, I loaded 5 rounds for a pressure test with this new lot of powder. It required 2 grains more to equal the energy of the first test lot, however it seems to have a higher pressure ceiling. I ran 80-85 grains. Easy extraction and no sticky bolt through 84 grains which produced 3055fps! I went ahead and shot 85 grains which hit the infamous Retumbo spike as it jumped to 3125fps. STILL, did not have heavy bolt lift. Obviously I stopped here. Sharpie marks on the head of the case showed no extractor hole marks until 85 which is so faint, you can't really see it. I popped primers and checked the fit of the pockets with .209" and .210 pin gauges. All cases were factory tight through 83 grains. 84 and 85 loosened by MAYBE .0005".

I decided 83 grains would be my max. I loaded up 21 rounds for a charge test all seated .040" off...81.8 - 83 grains in 2/10 increments. As you'll see in the pic, groups hovered just sub MOA until I hit the sweet spot at 82.4 and 82.6. This "node" looks to be about .5 grain wide. It's a great sign, but it will have to repeat. ES was higher than I like with these two groups running in the 30fps range. There will be a little testing involved to see if I can get that down under 20. Shooting at distance will tell the story as well. Pretty impressed so far! I'll keep you updated as I progress on this.

 

[Kentuckycoyle]

Super excited to follow your journey. I just bought a Seekins PH3 300PRC, but wanting a 7 something next. I’m very interested in your 7 Tyrant and how it performs. I’d definitely want to order dies from you so you can be somewhat compensated for all your work and research. I saw your post on FB and started following this forum. Thank you!

 

[Tumbleweed]

Super excited to follow your journey. I just bought a Seekins PH3 300PRC, but wanting a 7 something next. I’m very interested in your 7 Tyrant and how it performs. I’d definitely want to order dies from you so you can be somewhat compensated for all your work and research. I saw your post on FB and started following this forum. Thank you!

I appreciate that! I don't plan to stock any components at this time or try to make a small business out of it. I'm happy to provide guidance on projects, where to buy components and tooling and even some freebore lengths on the reamers. Feel free to PM with questions.

 

[babayaga2440]

Solid work. I’m gonna be finishing up burning the barrel out of my 6.5/7PRC this month. Would be interested in a 6.5 Tyrant

 

[Tumbleweed]

Solid work. I’m gonna be finishing up burning the barrel out of my 6.5/7PRC this month. Would be interested in a 6.5 Tyrant

Yep. That would be on par with a 26 Nosler....but shorter

 

[SlimCreaper25]

Don’t you dare threaten me with a 25 Tyrant. I have plans to do a 25-7PRC with a barrel that will be here in a few days…


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[khuber84]

Yep. That would be on par with a 26 Nosler....but shorter

On par? The 26N holds 102gr powder, your tyrant holds 92-93gr, a 65 version would be 91ish, that's a massive difference.

I do like your thoughts on the mag restriction, the 33nos to 30 makes sense. Buddy of mine wanted a 300rum with long freebore to mag feed, it wouldn't, so he took the 338 rum, and made it 30cal, worked great!

 

[Tumbleweed]

On par? The 26N holds 102gr powder, your tyrant holds 92-93gr, a 65 version would be 91ish, that's a massive difference.

I do like your thoughts on the mag restriction, the 33nos to 30 makes sense. Buddy of mine wanted a 300rum with long freebore to mag feed, it wouldn't, so he took the 338 rum, and made it 30cal, worked great!

My understanding is the 26 Nosler is in the 95 ish grains of water capacity from a couple sources…unless I’ve been misled. That’s why I made that statement. I could be wrong. I’d guess it would still be nipping at the heels of the Nosler

And measuring water capacity up into the neck is misleading when we don’t care about the neck’s capacity anyway. I wish there was a method to consistently and repeatably measure up to the bottom of the neck for comparison purposes between cartridges.


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[Tumbleweed]

Don’t you dare threaten me with a 25 Tyrant. I have plans to do a 25-7PRC with a barrel that will be here in a few days…


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Man that would be overbore…but pretty nasty!


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[khuber84]

My understanding is the 26 Nosler is in the 95 ish grains of water capacity from a couple sources…unless I’ve been misled. That’s why I made that statement. I could be wrong. I’d guess it would still be nipping at the heels of the Nosler

And measuring water capacity up into the neck is misleading when we don’t care about the neck’s capacity anyway. I wish there was a method to consistently and repeatably measure up to the bottom of the neck for comparison purposes between cartridges.


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26nos and 28nos have same shoulder position, so basically same usable capacity. Fired adg 28Nos holds around 103.5gr of water. Water capacity, is different than powder as water is more dense obviously. But water capacity is the standard at which cases are measured.

 

[Okie_Poke]

Cool project. Thanks for sharing!

 

[Tumbleweed]

26nos and 28nos have same shoulder position, so basically same usable capacity. Fired adg 28Nos holds around 103.5gr of water. Water capacity, is different than powder as water is more dense obviously. But water capacity is the standard at which cases are measured.

Yep. I’ve used QL for years with the standard of water to the top of a fired case for capacity. You got my wheels turning on a method to measure useable capacity to the bottom of the neck. Got an idea


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[Mike D Texas]

26nos and 28nos have same shoulder position, so basically same usable capacity. Fired adg 28Nos holds around 103.5gr of water. Water capacity, is different than powder as water is more dense obviously. But water capacity is the standard at which cases are measured.

Yep, here is new unfired ADG 28 Nosler necked down to 26. I wanted ADG brass for my 26 Nosler so I neck down 28 Nosler.

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[Choupique]

wish there was a method to consistently and repeatably measure up to the bottom of the neck for comparison purposes between cartridges.

Sacrifice a case and mill the neck off and then measure it?

If you dont have a mill or lathe to do that, you could cut the neck off with a cutoff wheel a little bit long, file it down to as good as you can do base of shoulder, and measure that way. Im sure that would be plenty good enough for comparisons sake.

Alternatively if you want to get REALLY technical, drill a vent hole in the base of the case, seat a bullet without a primer, flip it, and fill it with water through the primer pocket. Even drill the primer pocket out if you want. That would allow for some comparison accounting for bullets that seat past the neck. If a comparison is what you want more than an actual capacity, that would be very accurate.

 

[Taudisio]

Had this same idea years ago and changed directions. I have some unused 33nos Peterson brass (98 total) and a 33nos bushing die with the 7mm bushing if someone is interested, pm me an offer.
I am glad it is working out for you OP!

 

[turbobrick]

Had this same idea years ago and changed directions. I have some unused 33nos Peterson brass (98 total) and a 33nos bushing die with the 7mm bushing if someone is interested, pm me an offer.
I am glad it is working out for you OP!

I'm potentially interested in the brass.

 

[Tumbleweed]

Sacrifice a case and mill the neck off and then measure it?

If you dont have a mill or lathe to do that, you could cut the neck off with a cutoff wheel a little bit long, file it down to as good as you can do base of shoulder, and measure that way. Im sure that would be plenty good enough for comparisons sake.

Alternatively if you want to get REALLY technical, drill a vent hole in the base of the case, seat a bullet without a primer, flip it, and fill it with water through the primer pocket. Even drill the primer pocket out if you want. That would allow for some comparison accounting for bullets that seat past the neck. If a comparison is what you want more than an actual capacity, that would be very accurate.

Great ideas! A comparison would be the goal. Then you could come up with a percentage of differential.


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