154HHT, 163HHT and 168HHT in a 300 RUM

[BFD]

When it comes to efficiency, inherent accuracy potential, adequacy of power, and lethal distance...the 308 capacity cartridges (and smaller) are hard to beat ! This class of cartridges is an excellent choice

With FMJ even, but then the Hammers just force multiply the lethality. Like, 9mm handgun was a joke until bullet technology made leaps & bounds and now a 9MM defensive ammo is no joke.

 

[Mountainman]

My 132 HHT for my 280 AI came in, now to decide what powder to use.
Mountainman, I will be interested in your results as won’t be getting to mine for a few weeks

Tried 2 loads in the 280 AI this morning both with 132 HHT's. Had 5 rounds loaded with Ram Hunter and 5 loaded with Hybrid 100v each increasing in 1/2 grain increments. At 62 grains of Hunter I had a barely perceptible bolt click and was running 3319 fps. With the Hybrid powder I think I started high at 62 grains. Had a slightly stiff bolt right there and ran 3454, 62.5 grains stiffer bolt and ran 3467 and 63 grains ran 3488 with stiff bolt lift. I stopped there and will pull the other two. Velocities with Hybrid 100 are very high, bullets with both loads were all touching at 100 yards. I think I'm going to back the Hybrid down to 60 grains and do over.

28 Nosler with the 145 HHT's ran 3488 with 89 grains of N570. Going to switch to faster powder here. I don't think I can get enough N570 in there to reach best velocity

Regards,

 

[Beeman]

Mountainman, what is the barrel length of the 280 AI? I was looking at the 132. But right now I’m running the 140 AH at 3300 FPS out of a 23” 280 AI with H100V.

 

[Steve Davis]

My 132 HHT for my 280 AI came in, now to decide what powder to use.
Mountainman, I will be interested in your results as won’t be getting to mine for a few weeks

If start with something in the 4350 range. Maybe Varget.

 

[Mountainman]

Mountainman, what is the barrel length of the 280 AI? I was looking at the 132. But right now I’m running the 140 AH at 3300 FPS out of a 23” 280 AI with H100V.

It is a 26" 9 twist.

 

[joe16]

In between thunderstorms yesterday, I was able to safely get two more grains of Rx26 under the 154s and the 163s. Going to load up 4 of each and see how they group. Also interested to see the velocities across the chronograph too.

101.0 grains of Rx26 is the powder charge that I use for the 137s. Being able to get this safely (possibly 102, max safe for 137s) under the 154 shows me that there is a reduction in pressure and bearing surface with the wider PDR bands.

 Joe

 

 

[joe16]

Now I have to know if the 168s will outrun the 163s.

 

[gltaylor]

I LOVE all this testing!
Soon as I get enough data, I'll start posting the HHT spreadsheet

 

[joe16]

Rem 700
300 RUM
30 IN 11 Twist
Bert brass
GM 215
85°

154 HHT
CBTO 3.995.
1/2 FCD. top valley
Rx 26
101.0 avg vel 3910 Max (a little hot)
3887
3887
3933
3933
Two 2 round groups 5/8 & 1 3/4 x3 11/16 on hold. Try 100.0

163 HHT
CBTO 3.995.
1/3. shouder
Rx 26
99.0. avg vel 3766. Max at 85° safe
3755
3777
3777
3755
Two 2 round groups. 1/2 & 1 1/8. x3 5/8
On hold. Will back down to 98.5 and revisit

Going to order the 168 HHT. I just got to know.

Joe

 

[gltaylor]

Don't forget to post loads on Share your Hammer Loads. That'll keep me from having to search high & low - and maybe missing loads

 

[joe16]

Not there yet George but I'll get you something when I'm done I promise.

 

[gltaylor]

I've already posted your partial data.
You have the honor of being the first person to submit data on the HHTs!
For that you get (1) attaboy!

 

[joe16]

Love you GL

 

[joe16]

I edited the title of the thread to add the 168HHT.

I had my day all planned out. I was going to spend the morning figuring out the 168 in my 300 rum. I loaded up three of '98 grains of reloader 26 and one at 99 grains of reloader 26 and headed to the Orange Grove. after we had a short cloudburst at 10:00 a.m.

There was no work up. I didn't feel any needed after looking at the very slim bearing surface of the 168 I knew 98 grains would be a good place to start. The average velocity for the three shots was 3717 the extreme spread was a little disappointing at 41.
1/2 FCD at 3.995 CBTO
3734
3724
3693

The 99 grain registered no velocity on the chronograph. It had a small ejector swipe with no bolt lift restriction. I think this load could possibly be run too 101 grains. I'm going to find out. Interesting thing is that would be the same powder charge that is Max for the 137 HH.

I got back to the house and proclaim to the wife that I was done and extremely happy and satisfied with today's shooting. She looked at me and said "good it's time you take me to breakfast" I think Steve owes me a breakfast just saying.

This was the three shots of 98 grains. I did not shoot the 99 grain load at this target. I did not want to screw it up. But interesting thing is that it's point of impact on another Target show that it would have hit somewhere inside that ragged hole. I love Hammer bullets!!!

Joe

 

[MeatBuck]

3993 or 3693?

 

[joe16]

3693

Thanx

 

[mtmuley]

The .300 RUM is a fantastic cartridge. I remember when the internet said it would fade away. Ha! mtmuley

 

[gltaylor]

Dang joe,
Did you figure out how to "edit" a group????


(Good job!)

 

[joe16]

YEP!

 

[joe16]

I ran the 168 to pressure yesterday with reloader 26. Using the same Bertram brass in the same Federal Gold Medal 215 primer loaded the bullets all too 3.995 cbto. Using a 1/2 FCD

98.0. Two shots with an average velocity of 3703 and a group of sub 1/2 in. A slight swipe was noticed on these two cases

99.0 two 2 rd groups were fired with an average velocity of 3734 group sizes were approximately 1/2 in and 5/8 for all four.
3663???
3766
3755
3755
A distinct ejector swipe apparent on all four cases. A slight increase in Bolt lift.

100.0. Two shots were fired with this powder charge and the average velocity was obvious. The group size was approximately a half inch.
3766
3766
This was definitely Max charge for 85°. There was a definite increase in Bolt tension and an obvious ejector swipe. What was interesting in all the shots fired, the first one each time (cold barrel ) landed true. The subsequent second shot all shot slightly up and to the left. Must research this.

Going to load a half a dozen or so up at 98.5 and give those a whirl next.

Never hit 3800 I'm also going to try some WC 857 see what that military pulled down crap will get me. You never know until you pull the trigger. It was able to get within 35 ft of Steve's 199 N570 load.

This place is special