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Old 08-06-2012, 01:17 PM   #11
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Default 8mm Rem Mag & Range Report

8mm Rem Mag Range Report - 220gr Sierra SBT, RL-25 and RL-22, Rem brass, Rem 9 1/2M primers, OAL 3.600", Velocity 3009fps



It was an awesome and interesting morning to say the least and the 8mm Rem Mag is a beast at both ends. Anyone who says he likes to shoot an 8mm Rem Mag at the bench for more than 21-25 rounds has something truly wrong with them. Now that said, I am use to a 340Wby without a break shooting 225gr bullets which generates 43.0ft pounds of free recoil. The velocity of recoil though is just a tad slower than the 8mm Rem Mag even though marginal I felt the difference. Here are the stats on the free recoil and velocity of recoil for the 8mm Rem Mag with a 220gr Sierra SBT moving 3009fps on the average.

Cartridge: 8mm Rem Mag
Firearm: Remington 700
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): 86
Barrel Length (in): 24
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 0.14 in (3.6 mm) of travel
Recoil impulse is 4.7 lbf-sec (21 Newton-sec)
Powder gases generate about 38 percent of the total recoil impulse & velocity

Now the recoil thing out of the way - I found RL-25 to give me higher velocities for max load in my rifle over RL-22. Also, it gave me better accuracy, better extreme spread and better deviation. Now this is not a bench gun, it is a purer hunting rifle. My last group was actually the fastest velocity wise and also the best accuracy. Temps were low 80's with 91% humidity and my elevation was 105ft above sea level.

Here is the average velocity and group size of the max load of RL-22 in my 8mm Rem mag. and group size was 1.2"





Here is the average velocity and group size of the max load of RL-25 in my 8mm Rem mag. and group size was .866", Extreme spread 20 Deviation 10
Note: (this was my last group shot for the day, and recoil was taking its toll and I was still getting use to my trigger, so this is in my opinion a good load for hunting)




top velocity of the day


All and all I am very excited about the 8mm Rem Mag in a fine rifle to use on big game. It is evident that anything hit with this 8mm Rem Mag will die quickly if not immediately depending on shot placement, but this beast will end the life of any beast hit with it and more than likely be DRT. Very impressive cartridge. Yes I can't wait to hunt with it.



Changed my mounts and rings. The Quad Rings were not keeping my scope from turning with the significant recoil of the Big 8 and I was afraid if I tighten them more than I had them I might strip a tread in the aluminum rings. So I went to a real traditional look with steel Leupold mounts and rings.

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Old 08-06-2012, 01:18 PM   #12
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220gr Sierra & 200gr Accubond - 8mm RM bullet & load test

Well, it was a long wet, rainy morning and my 220gr SBT still showing great accuracy and velocity wise but the bullet does not hold up at 25yds with 4287.3 ft pounds of energy. The 200gr Accubond is shooting ok at 1 1/4" using RL-25, MRP was great velocity but poor accuracy, RL-22 poor velocity and poor accuracy and I did not have enough IMR7828ssc to finish three rounds so will do that later. RL-25 was not a max load for my rifle or nor was it a book max load, but was giving me 3117fps on average and it did as all Accubonds are intended to do, it held up at 25yds hitting the water jugs with 4183.7 ft pounds of energy.

Frist - here is the test with the 220gr Sierra at 25yds hitting the jugs with 4187.3ft pounds of energy.


Note: 8 jugs of water and I had to use a bungee cord to hold them on the short table.



There is no bullet to show you because it went through five jugs and barely marked the 6th jug with a small fragment and bounced off. I could not find any pieces of the bullet, that is right, it totally after five jugs disintegrated. I did this test a second time and the same results, five jugs a small mark on the 6th jug from a fragment and I could not find any pieces of the 220gr Sierra. I looked all in the grass to try and find just a piece but couldn't. Needless to say, the 220gr Sierra is not for up close in the 8mm Rem Mag. It is obvious a 100yd to 600yds on deer and elk size game, but not for dangerous game. I would only use a 220gr A-Frame on dangerous game out of the Big 8 or if it existed a 220gr Accubond.


Second - here is the test with the 200gr Accubond moving 3117fps hitting with 4183.7 ft pounds of energy at 25yrd, going through 7 jugs ending up in the 8th jug knocking the 9th jug off the table.














Needless to say I will be working on tweaking the RL-25 load for the 200gr Accubond because I was not at max yet for my rifle nor at book max. The 220gr gr load will still be a long range load, but at the moment I will be working on the 200gr Accubond as an all around load and will later work on the 220gr A-Frame as my dangerous game load until Nosler sees fit to produce a 220gr .323 bullet.
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Old 08-06-2012, 01:21 PM   #13
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Today was an interesting morning but you talk about hot and humid. Once again to remind everyone, this is an out of the box rifle with no glass bedding or pillar bedding and this rifle uses a pressure point up close to the end of the fore end. No, I do not have any intention of changing it at the moment. But today was a very good day of discovery. First, 200gr Accubonds give me great velocities but the accuracy is very poor. I have tried now different loads with RL-25, RL-22, MRP, Magnum and IMR7828 and the groups are embarrassing to say the least. My rifle simply does not like them. I have 100 200gr Accubonds left and will trade them for some 200gr Partitions if someone is willing to do so, and if you are willing please pm me about trading.

Magnum powder preformed well, my barrel did not get as hot to the touch as with the other powders and accuracy was fair to good but average velocities were 2951fps with the 220gr and that was disappointing. Now IMR7828 did very well in velocity with the 220gr SBT and accuracy was good and this was with one grain under book max. I am very please with this powder and the Sierra SBT. I will be soon testing 250gr bullets and also some 200gr (forgive me for even using these words and don't remind me of my dislike for terminal results I get with the :mrgreen: - Barnes TSX).


220gr SBT, 83.0grs IMR7828, Rem brass, Rem 9 1/2M primers, 3016fps, OAL 3.600" .964 minus first round which was first round out of a clean barrel. After ten shots this group should tighten up a little more once the barrel is fouled good.



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Old 08-06-2012, 01:22 PM   #14
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Man, this 250gr Barnes orginial in 8mm sure makes the Sierra 220gr SBT look anemic. Can't wait to work with this bullet, but that will be when the weather get just a little cooler.


What a cool looking beast, and at 2800fps WOW!!! 8)

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Old 08-08-2012, 11:26 PM   #15
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Allot of 8's really like flat based bullets. Try some 175gr Sierra hunters for an off chance they work. Here is a good 200gr to try.
http://www.speer-bullets.com/ballistics/detail.aspx?id=111

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Old 08-13-2012, 04:07 PM   #16
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jpattersonnh, I am going to try the the 200gr speer later on but not the 175gr Sierra.


Well, I did some more range work with my 8mm Rem Mag and I have discovered that my rifle does not like 200gr Accubonds or Partitions, but does like 220gr Sierra and 250gr Barnes Originals.

First: The 200gr Accubonds will give me 3154fps and the Partitions will give me 3137fps. These are awesome velocities but accuracy is not acceptable to me running 1 ¾” at best to 3 ¼” for most groups.






Second: The 220gr Sierra SBT gave me last time I was at the range working with this bullet 3016fps on the average. This time 3018fps on the average with 21 Extreme Spread and 9 Deviation and a three shot group size of .487” – This was the seventh and last group I fired and still had this level of accuracy after all that recoil. The first group I fried was after one fouling round from a clean barrel and it was a three shot group that was .849” and it had an Extreme Spread of 20 and a Deviation of 9 giving me 3017fps.

Three shot group .487", 220gr Sierra SBT, 3018fps average


Three shot group .849", 220gr Sierra SBT, 3017fps






Third: There were the two groups I fired using the 250gr Barnes and was 5% with below published max with one group and 4% below max with the other group, giving me from 2701 – 2720fps as I was testing in the margin of safety to make sure I did not get close to max pressures with this very soft bullet. Of course I will now increase my charges moving toward max hoping to be over 2750 – 2800fps with an accurate load. Group sizes were as follows as I increased the powder charge from 5% to 4% below max. Best group was .447” with Extreme Spread of 22 and Deviation of 11, and worst group was .8485” with Extreme Spread of 22 and Deviation of 11.

Three shot group .447", 250gr Barnes Original 2720fps


Three shot group .8485" , 250gr Barnes Original 2701fps

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Old 08-13-2012, 04:13 PM   #17
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Good write up. Thank you.

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Old 09-21-2012, 04:25 PM   #18
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tacticalfun, thanks - I decided to test my extended load work with my hunting load for my 8mm Rem mag and also looking for better velocities for my 250gr Barnes Original. My average today with the 220gr Sierra was 3003fps and this is due to me using after I full sized my brass an expander mandrel expanding the diamater of the neck .002 and then using the regular mandrel for my Sinclair neck turner. This reduced the neck tension which also reduced my pressures and velocities from 3018fps on average to 3003fps but group is much tighter. Was able to get the 250gr Barnes Original to 2749fps and what was amazing today was all three of the rounds were 2749fps.









Remington 700BDL 8mm Rem mag, Leupold FX 6x36mm LR Duplex.

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Old 09-25-2012, 04:15 PM   #19
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According to Q/L the 180gr GS Custom has a BC .463, 4175ft pounds of energy at muzzle using IMR7828, still 2000ft pounds of energy at 560yds, 2.4" high at 100yds with a zero of 270yds, -5 at 350yds not bad not bad at all - plus still moving at 2174fps at 600yds and the GS will open up at 1500/1600fps (these ballistics are calculated at 4,000ft the lowest elevation I will encounter in Arizona where I am thinking about using them).

Now if GS will return my email about a USA distributor since they are setting up shop in the USA to manufacture the GS Custom I will get them faster. The GS out performed the TSX and TTSX in my 257Wby and 30-06 on terminal results on deer when I used them alternating between the two bullets during a 3yr period. Also, I have been able so far with 200gr, 220gr and 250gr bullets to duplicate with my Big 8 the velocities Q/L estimated and in one case even higher velocities. This will be truly interesting when I get some.

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Old 09-26-2012, 03:10 PM   #20
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Well, I have my name added to GS Custom Bullet list to notify when they start production in the US. I will wait till then, the prices are to high for the bullets shipped from South Africa. Including shipping from South Africa for a box of 180gr is 87.00 and one box of the 170gr is 83.00 and I would need at least two boxes of either one to do proper load work and have enough for practice at distance and final sight-in. I will wait!

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