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8mm rem mag 24" barrel 220 gr sierra 3200 fps, where to stop?


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#1 Dang Dawg

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Posted 28 February 2021 - 02:55 PM

HUMM think it's OK?

We where out today trying some 8mm RM loads.
I have some original Rem Factory 220 gr rounds.
We ran them over our Speedometer and got 2750 FPS.
Just forward of the "Band" we mic'ed it at .505 before shot and .512 after.
I shot A one 1 1/2 " group ( dang windy today).
I have a load we worked up with the same sierra bullet.
Speed runs right at 2990 to 3000 fps.
I shot a 1 inch at 120 yards. It Mic'ed at .512 and did not expand.
No sighs of presser.
I was looking for more, don't know what but always looking, like 5000 FP energy is lacking.
We got some reloader 26 ( finally), it is supposed to be great stuff. There is little to NO load info, so I'm not going to list the charges.
I had a guy do a Quickload work up on it and got some data.
At the Minimum load we got just under 3000 fps, on sign of presser
and no expansion. Groups where over an inch.
At About 25% over min we got right at 3100 fps, about the same for groups, little more then our worked up loads.
Then we tried a charge about 2 GR under max.
We got a smidgen over 3200 fps and only slight sign of presser, primer a little flat but still very easy bolt lift, the explanation went from .512 to .5125.
Still safe in my mind at 20* but I don't know what it would be at 90* Is 200 fps increase over any published speeds out of line?

The group did open to just under 2 inches.
That is still better then the published groups.


Here are some published loads for a sierra 220.
220 Sierra SBt Alliant RL-25 2965 FPS 2.95 inch groups
220 Sierra SBT Ramshot Magnum 2825 Fps 2.97 Inch groups.



Should I go on?
How fast is to fast?
If I go on I would want better groups then 2" at 120 yards.
Maybe have to adgust the "Jump" to see an improvement.


Like the shooting ,Love the Hunting


#2 hassell

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Posted 28 February 2021 - 04:18 PM

Interesting, consistent accuracy is more important than speed in my opinion.



#3 youngdon

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Posted 28 February 2021 - 10:46 PM

Interesting, consistent accuracy is more important than speed in my opinion.


Truth. A fastball off the plate in hunting is likely a wounded animal.

                          Tree Branch Calls

      

 

Never kick a dead coyote, especially one that ain't dead when your gun is still in the kitchen. Just ask your favorite Yooper what will happen. But if its a bobcat in a 330 coni and you think he's dead,,,,,Think again.. And we know you were wearing less than your PJ's on the last one you shot !

                                                       

                                                         

20 years ago we had Johnny Cash, Bob Hope and Steve Jobs. Now we have no Cash, no Hope and no Jobs. Please God, don't take Kevin Bacon !

 

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#4 knapper

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Posted 28 February 2021 - 10:56 PM

I don't know what you plan on hunting with it but that is a lost of rifle! Stick with a slower velocity and you may get better groups.



#5 glenway

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Posted 01 March 2021 - 03:29 AM

Shooting a behemoth like that with groups that small is very good considering the size of kill zones it's designed for.  You could probably get the groups to shrink a bit with a high-quality target scope, but then it wouldn't be a hunting rig.



#6 Dang Dawg

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Posted 01 March 2021 - 06:23 AM

I know.

Groups are more important.

The speed is still 200 feet per second faster than factory shells with my already worked up load.

I'm just looking.

I still have 2 full gr I can go up maybe i will find something at the upperend.

Or with the seating I can still do.

If not I still have a load, with my normal powder, I can shoot a 4" group at 500 yards with a bullet that is still supersonic at 1000 yards...

I do kinda wish for better times in the component world. Even reloading it cost me $1.50 not counting brass to test each shell, IF you can find components.


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#7 hassell

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Posted 01 March 2021 - 03:59 PM

Wow, probably 10 x's that up here.



#8 glenway

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Posted 02 March 2021 - 03:23 AM

Today's component costs are going to seem like a bargain in Joe's Utopia.



#9 youngdon

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Posted 03 March 2021 - 06:48 AM

I’ve considered removing my guns from the safe and putting the primers in instead.

                          Tree Branch Calls

      

 

Never kick a dead coyote, especially one that ain't dead when your gun is still in the kitchen. Just ask your favorite Yooper what will happen. But if its a bobcat in a 330 coni and you think he's dead,,,,,Think again.. And we know you were wearing less than your PJ's on the last one you shot !

                                                       

                                                         

20 years ago we had Johnny Cash, Bob Hope and Steve Jobs. Now we have no Cash, no Hope and no Jobs. Please God, don't take Kevin Bacon !

 

If you want to be successful, Be like a postage stamp, Stick to it until you get there

 

 

RIP Chris Miller

 

 





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