Go Back   The Hunter's Life > GUNS & AMMO > RELOADING
Thread Tools Display Modes
Prev Previous Post   Next Post Next

Range Report on the 8mm Steyr Long Throat
Old 10-16-2008, 03:02 AM
gitano's Avatar
gitano gitano is offline
Join Date: Oct 2004
Location: Wasilla, Alaska
Age: 69
Posts: 19,474
gitano is on a distinguished road
Default Range Report on the 8mm Steyr Long Throat

I wasn't pressing too hard for this rifle to be ready to make the Colorado trip, but since I was going to the range anyway, I thought I'd see if the barrel was at least "OK". I bought this barrel off of EBay a couple of years ago. It is a Carl Gustav custom barrel that was initially chambered in 8x68. I had to turn off the existing threads, re-thread and re-chamber it. It is a "bull" barrel of sorts, and in addition has a "choke" - an enlarged area for the last 3" of barrel. After finishing, the barrel ended up 23.25" long. I kinda had high hopes for it.

While I fully intended to put a 'scope on this rifle, I had yet to get the mount, rings, or 'scope. So... this range session was really just to get a 'feel' for the thing and make sure the barrel wasn't a piece of garbage.

The whole point of making the rifle with a "long throat" was to be able to shoot heavy-for-caliber bullets - Hornady 195s or Sierra 220s - from the necked-down .376 Steyr case. So, based on Optimal Barrel Timing theory and using Quickload, I came up with a range of charges for the Sierra 220 BTSP. The charges chosen ranged from 65.88 grains, -1% down from the node charge, to 64.55 grains, -3% down from the node charge. The powder I chose was Reloader-22. I also loaded up three 195-grain Hornadys, just to use to 'get on paper'.

As I did with the .375x.284 Win, I shot the bullets "round robin". Meaning that I shot one bullet from each charge in each of 5 'rounds'. That minimized the effect of "order of firing".

A quick check at 25 yds, and I moved the target to 50 yds and started shooting the 220s. Here's the target:

As I saw on the .375x.284 Win loads, the first shot out of a cold barrel on a cold day was predictably an 'outlier'. The only group where this doesn't look to be the case is the 65.55-grain group, however, the upper right shot of that group was a 'called' flier. Keep in mind, that these shots were shot with open sights. So... the crappy groups shot at 100 yards with the 'scoped .375x.284 Win can't be blamed on "the nut behind the butt". At least not this time. Actually, "it" gets better. All I wanted to do was "check the barrel out". Yeehaa! It lookes like there are only three shots in the 64.89-grain group. Let me assure you that there are actually 4! Two bullets in one hole is not too uncommon, but these two are almost exactly on top of each other.

From lowet to highest, the average muzzle velocity for each group is: 2556, 2569, 2587, 2601, and 2613 f/s. All of the 3-shot groups (excluding the cold barrel first shots of each), except the 65.88-grain group are GREAT as far as I'm concerned - even if they are at 50 yards.

From lowest charge to highest, the 3-shot group sizes are:

64.55-grains = 1.137" x 0.594",
64.89-grains = 0.535" x 0.202",
65.22-grains = 0.462" x 0.521",
65.55-grains = 1.146" x 0.790", and
65.88-grains = 1.125" x 1.695".

Now I gotta tell ya folks, I'da been happy as a clam with the size of the last group. But four of the five groups are darned respectable even at only 50 yds considering the sights. Again, I haven't "cherry-picked" the shots. All of the 3-shot groups exclude ONLY the first shot from a cold barrel.

So, I think I'll focus my attention on the 65.22-grain charge, and see how that shoots with a 'scope.

I'm stoked about this rifle and this bullet. AND IT'S A BOAT-TAIL TO BOOT!

Oh yeah, I forgot to tell ya - the sights were just taped on with electical tape.

This thing might be scary accurate once fitted with a 'scope.


PS - I just noticed that the annotation on the target indicates it was shot at 100 yds. That's wrong. It was 50 yds. I was "cutting an pasting" from the 375 target and didn't make the change.

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

Last edited by gitano; 10-20-2008 at 09:36 AM.. Reason: Correct 100 yds
Reply With Quote

8mm, 8mm slt, obt, quickload, range report

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Steyr M95 8x56R Range Report gitano RELOADING 21 12-10-2008 10:20 AM
Long range performance sakorick RELOADING 13 07-28-2008 08:07 PM
1912 Steyr Chileno range report sakorick FIREARMS & OPTICS 2 07-15-2008 06:31 PM
Short-throated Steyr Range Report. gitano RELOADING 4 03-25-2008 01:48 AM
My Day At The Long Range. Steven Fletcher VARMINT/PREDATOR 2 01-29-2006 09:36 AM

All times are GMT -5. The time now is 05:32 PM.

vBulletin skin developed by: eXtremepixels
Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.