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8mm SLT Swaged Bullet Load Workup
Old 05-04-2015, 02:39 PM
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Default 8mm SLT Swaged Bullet Load Workup

I've been doing some swaging calcs which got me to thinking about swaging (imagine that), and I decided that I needed to find a "standard" and make that work.

Sparing you the gymnastics of how I arrived at the number, I have decided on a 136.3-grain bullet as my light-for-caliber (LFC) bullet from these jackets. This puts it in the category with the 115-grain 7mm HP and the 130-grain .308 HP bullets that I like so much. I decided to make it a "spitzer" with exposed lead tip. I'm not real happy about that, but I can't get enough bearing surface if I go lighter, and going lighter is required if I want HP unless I change the core material. I swaged up 35 of them.

The bullet weighs 136.3 grains, +or- 0.1 grain.
The bullet is 0.900" long.
The meplat is 0.100" in diameter.
The bearing surface is 0.315" in length, (bore diameter but essentially only 1/3rd of the total length That 8R ogive is a pain).
The theoretical BCs are:
3450 and above: .290
3000 to 3450: .276
2000 to 3000: .270
1000 to 2000: 266

Using 71.3 grains of Reloader-17 in my 8mm SLT, I can get it (theoretically) right on the 3rd timing node at 3350 f/s for the 23.352" barrel with an estimated max pressure of 55k PSI. Here's a picture of the trajectory table specs:

From my perspective, it's 'good'. 3400 ft-lbs at the muzzle is as high as I want to go. In the 11.0 lb rifle, that's not unpleasant. (100 ft-lbs less than my .338 Win Mag shooting 225-grain bullets at 2650 f/s which I find "fine", and the .338 weighs 2 lbs less.)

About an inch and a quarter high at 125 yards, six inches low at 300 yards, and carrying 1500 ft-lbs out to 330 yds. "My kinda bullet/cartridge/rifle."

Considering how well this rifle shoots the 220-grain Sierra, I have SOME hope for this bullet. HOWEVER, this Steyr LONG Throat rifle wasn't "made" to shoot LFC bullets. I have made another rifle, the Steyr SHORT Throat, specifically for shooting LFC bullets. That rifle will, (I have to put a new barrel on it), have a barrel of at least 26" length. If I can get one to 28" I will.

I'm going to get a range report on this as soon as I can. 'The new local range is closed for "renovations" until late June or early July. I might be able to get to a 100+ yard range before then. If I do, I'll 'report' here.

Then you will know the truth, and the truth will set you free. John 8:32

"We make men without chests and expect of them virtue and enterprise. We laugh at honor and are shocked to find traitors in our midst. We castrate and bid the geldings be fruitful." ~ C.S. Lewis.

Do not confuse technical skill for wisdom and do not confuse strength for skill. Paul Skvorc
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8mm slt, 8x57, load work-up, swaged

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