Back Online With My Big 8
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Old 12-28-2012, 05:18 PM   #1
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Default Back Online With My Big 8

I just could not take it anymore not having my 8mm Rem Mag up and running so I decided to do some work and if I messed it up Lance was going to get the chance to straighten it out.

First: I did a little more sanding work on my full stock bedding I attempted with my wood stock. I was able to get everything really snug.

Second: I did a little more lapping of the muzzle bore area trying not to destroy the crown and final muzzle area as I remove a good deal of the rust pits.

Third: I decided to change scopes using a Redfield with Accu-Trac and also used Talley one piece rings.

Fourth: Since I am only hunting hogs and deer right now I decided to use IMR4350 instead of IMR7828 and Rem 9 1/2M primers, behind a 220gr SBT so I could lower my velocities to 2800fps or a little above matching to a "T" the Accu-Trac on a 4-12x40mm Redfield still giving me 3945ft pounds of energy at muzzle and 2033ft pounds at 500yds, with a 2.1 inch high sight-in at 100yds and as I said matching the Accu-Trac marks on my scope.

Average velocity


First group 1.073"


Second group 0.973"


Up And Running (not a target rifle but good enough for hunting)








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Old 12-28-2012, 05:25 PM   #2
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Nice looking rifle!

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Old 12-28-2012, 05:40 PM   #3
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Very nice.

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Old 12-28-2012, 05:56 PM   #4
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Thanks, taking it to the field for the first time this Monday and then the following week.

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Old 12-28-2012, 07:51 PM   #5
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Great lookin' stick bullet!

You have encouraged me to get my 8x57mm Mauser up and running.

I enjoy your posts and look forward to your harvest report when you finally fire this sweetheart in anger.

Keep us posted.

cane

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Old 12-28-2012, 10:13 PM   #6
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I have decided to back off my max load of IMR7828 and drop one grain which will give me around 2950-2970fps and this I all ready know is a very accurate load and this means that I only sight in at 2.0" at 100 and that put me exactly on the Acuu-Trac settings and give me a good balance between the 2842fps (IMR4350 load) and the 3009fps (IMR7828 max load) and is actually more accurate than the 3009fps load. This will give me 4252ft pounds of energy at muzzle and still 2121ft pounds at 500yds. Lots of power and lots of reach especially with the Accu-Trac. I will fire sight in rounds tomorrow morning early before the wind gets above 12 mph.

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Old 12-29-2012, 11:31 PM   #7
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Reduced Max load by one grain, 220gr SBT, 13ft extreme spread, 5 Deviation, group size 1.197"







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Old 12-30-2012, 12:08 AM   #8
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This ain't good your starting to make me want one a gun shop I go to has a 8mm rem mag rem 700 cdl for a 800 bucks but I'm scared of the recoil it puts out lol

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Old 12-30-2012, 01:20 AM   #9
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It will kick like a 340wby with no break, but that said, I like to shoot this 8mm Rem Mag better than my 340Wby Mark V because the recoil pad is better than the Mark V. If you are shy of recoil you might want to note the following:

Well, lets put the Big 8 in perspective when it comes to recoil. But first, this 8mm Rem Mag of mine feels better and is easier on me due to the recoil pad than my 340Wby Mark V. Now that said, here is the data.

Cartridge:.8mm Remington magnum
Firearm: Remington 700 BDL
Load and Firearm Info:

Bullet Dia (in): 0.323
Case Length (in): 2.850
Case Volume (gr H2O): 93.5
Muzzle velocity (ft/sec): 3009
Bullet Wt (gr): 220
Charge Weight (gr): 83
Barrel Length (in): 24
Firearm Weight (lb): 8.20
Free recoil energy is 42.7 ft-lb. (57.9 Joule)

FACTOIDS:
Free recoil velocity is estimated to be 18 ft/sec. (5.6 m/sec)
(This is equivalent to dropping the 8.20 lb gun from a height of 5 feet.)
The free recoil volocity is gained in only 0.15 in (3.8 mm) of travel
Recoil impulse is 4.7 lbf-sec (20.8 Newton-sec)
Powder gases generate about 37 percent of the total recoil impulse & velocity



Cartridge:.340 Weatherby
Firearm: Weatherby Mark V
Load and Firearm Info:

Bullet Dia (in): 0.338
Case Length (in): 2.825
Case Volume (gr H2O): 93.5
Muzzle velocity (ft/sec): 3035
Bullet Wt (gr): 225
Charge Weight (gr): 83.7
Barrel Length (in): 26
Firearm Weight (lb): 8.50
Free recoil energy is 42.1 ft-lb. (57.1 Joule)

FACTOIDS:
Free recoil velocity is estimated to be 18 ft/sec. (5.4 m/sec)
(This is equivalent to dropping the 8.50 lb gun from a height of 5 feet.)
The free recoil volocity is gained in only 0.15 in (3.8 mm) of travel
Recoil impulse is 4.7 lbf-sec (21 Newton-sec)
Powder gases generate about 36 percent of the total recoil impulse & velocity

For long range shooting with the 220gr Seirra SBT my max load at 3009fps with a .520 BC and a SD of .301(remember I only have a 24" barrel), is not bad at all.

Muzzle energy is 4423ft pounds
Remain energy of 2,000ft pounds out to 614yds

Zero is 255yds
-6" 333yds
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Old 12-30-2012, 01:27 AM   #10
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Is it comparable to a 31/2inch turkey load from a mossberg 835?

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