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.