338 RPM Range session

[Fotis]

338 RPM …some self-extrapolated data I got to test



six lug Accumark 24" barrel



175 Hammer hunters so far so good.



69gr RL16 3050 fps (same velocity as factory in my accumark six lug, but they used 185 TTSX)

70gr RL16 3065 same hole as above

71gr RL16 3105 1/2" apart from above group
72gr RL16 3159 .3" apart from above shot



64 gr H4895 3220 fps safe max in my mind. just slight cratering.......



70 gr CFE223 3100 fps



Modified Ladder test so I know where I am at with pressures. I had nothing to go one so I did not want to waste a whole day pulling ammo.



Thinking 69-70 RL16 should be very accurate and is not close to max load.

 

[MallardSX2]

How is the recoil?

 

[Fotis]

About a 30-06 or so. It is an MK V Accumark but it is the 6 lug version and weighs 7 lbs bare naked.

 

[BjornF16]

Weird they don’t offer 338 RPM in the Accumark Pro/Elite.

The Apex would be better with shorter barrel.

 

[sndmn11]

Do you have access to Staball 6.5?

 

[Sboliver]

Id be interested to hear more results when you get any. Was looking at building a 338 federal. First time I've heard of the 338 rpm. I'm going to start do research on this round

 

[Fotis]

I just loaded some staball and 748.

 

[Shotzie43]

Fotis, I’ve been watching this thread for a while, hoping you would list some more data for the 338RPM. I’m a newer reloader, and not brave enough to figure this stuff out on my own. I bought the 175 Hammer Hunters and RL16 after reading your post. My gun is a 2.0 TI, 18”, and if I can get a good round worked up, I want to take this on a backcountry hunt where longer shots will come into play. I’ve been playing with 185 gr. TTSX pushed with 70.2 grains of Ramshot Big Game. ES is at 5 fps, but groups are 1” at best. I’m playing with seating depths to try to tighten it up, but I’m really looking forward to trying the RL16/175 Hammer Hunters. Is there any more guidance you can give on load data??

 

[TaperPin]

What a cool combination - just sayin’