Maks lading 300 win mag 212 hornady eld x

[Jessie]

Naand Manne

Ek wil graag Hornady se 212 grein Eld X probeer in my 300 win mag met Vihtavuori N570. Ek het op Vihtavuori se website gekyk maar hulle het nie laai data met N570 vir 212 grein punt nie. Ek Sal dit opreg waardeer as een van die quick load manne asb kan loser wat ek as die maximum spoed moet beskou met die data hieronder dat ek nie myself in die moeilikheid kry nie.

Kaliber. 300 win mag
Punt. 212 grein Hornady Eld X
Primer. CCI 250
Kruit. Vihtavuori N570
Doplengte. 66.40mm
Dop. Norma
Dopvolume. 93.80 grein
Looplengte. 656mm
Maks TPL. 94.10mm
TPL gelaai. 92.77mm

Ek het die volgende ladings geskiet en spoed is gemeet 4.8m van die loop. Spoed is gemeet met chrony.


76.20 grein - 2778 en 2772
77.40 grein - 2854 en 2887

Baie dankie

[Dale SH]

92.77mm TPL ?
Is that correct or a typing error ?

[Jessie]

Hi Dale

It is correct. I just measured a loaded round. It does not fit in the mag but shoot it as a single shot rifle. I also measured one of the bullet heads and they measure just over 40mm. Appreciate your assistance

[Dale SH]

Jeez thts some long freebore you have on your rifle.
Is it a Weatherby ?

As things stand with your current batch of powder and components and with the infomation supplied the highest node potentially achievable is

Node 5
79.3 grains
2958 fps -15 fps on the chrony at 5 meters
59500 psi so approach this load with caution

[Jessie]

Hi Dale

Thank you for the information.

No it is a winchester M70 supergrade. I still measure the max TPL with bullet in the barrel and cleaning rod. I measured the max TPL again three times after your previous reply and it measured 93.90mm. There is a 0.20mm differences from what I measured originally, don't know if that will make a huge difference? But the total length of the rounds that I loaded is correct.

Based on your calculations where about will node 6 be. Will be happy if I can get something around 2800 a 2850. Thank you for your assistance I really appreciate it.

[Dale SH]

Based on your calculations where about will node 6 be. Will be happy if I can get something around 2800 a 2850. Thank you for your assistance I really appreciate it.

I am going to recommend 76.8 grains for an average of 2839 - 15 fps (2824 fps on the chrony)
51800 psi

Lets us know how that works out.

[Jessie]

Thank you for the info. Will let you know after being at the range. Thanks again for the help

[Jessie]

Hi Dale SH

I will appreciate if you can assist with this load. This bullet and powder are driving me crazy. I have tried various loads around the load that you suggested and it work to a certain degree. The best grouping that I could manage was 2.25 inch and I got this type of grouping between 76.3 and 76.9. Every time I shoot between 76.3 and 76.9 it shoots 2 next to each other and one it chucks 2 inches away. I first thought it was the peanut behind the gun but asked a friend to shoot and the same happened to him - two next to each other and one two inches away. The one two inches away is always horizontal. I then tried my current hunting load - 200 grain Nosler partitions and with 4 shots the group is below 20mm at a 100 meters. I am nearly through the powder tin and I was at the range today and the same happened. I loaded some reduced loads also. Below is the results of today shooting. chrony was 4.8 meters from barrel. I tested the capacity of the brass now and it measured 94.8 grain. I know that is 1 more grain as indicated above. The capacity that I gave originally was after 1 shot. What I measured today was after three firings.

75.60 grain - 2846, 2844, 2852
76.50 grain - 2893, 2890, 2887
76.80 grain - 2887, 2894, 2896

Grouping of bottom two was better than the first one. I will appreciate if you can maybe adjust the case capacity and the speed measured above and see where the node is. I don't need the highest node. Something around 2800 is 100 percent. Your assistance will be appreciated.

Thank you

[Dale SH]

Jessie.

Flyers are always really difficult to explain as there are so many contributing factors and some questions need to be answered.

The most common cause of flyers is the barrel touching the stock.
1.Did you allow enough time for the barrel to cool between shots or did you shoot a string of shots ?
How much clearance is there between your barrel and stock ?
Are you shooting off a bipod or rest/sandbag ? If so is the barrel touching on the rest and are you loading the bipod correctly ?
Are you applying pressure to the barrel with your hand at all whilst shooting ?
Are your action screws tight and torqued ?

Shooter fatigue
How comfortable are you shooting the third shot ?
A 300 Win mag with a heavy bullet generates some recoil and is not pleasant after a few shots ?
Are you shooting with a silencer and if so are you getting a heat mirage in your scope ?
Is your scopes parallax set correctly for the distance you are shooting ?

If there are two shots touching each other then this tells me that the load is accurate.
My first reaction is that the stock to barrel clearance is not sufficient and your barrel is touching the stock when it warms up.

Was there any noticeable difference between the velocities of the 3rd shot in comparison to the first two ?

[Jessie]

Dale SH

Thank you for the reply.

The actions is glass bedded and the barrel is free floated. Tested this morning again with R10 note. I give 2 to 3 minutes between shots and then after three shots I wait for 5 minutes before shooting again. I am shooting over a Caldwell 'the rock' front rest and a small sand bag for a back rest. Originally I did not hold the rifle with my front hand but after I was struggling to get groups and read on the Internet regarding shooting technique when shooting high recoiling rifles. After reading I started using my front hand also pulling the rifle back into my shoulder. I use this method with my big bore rifles and works for me. I will not advertise myself as the world best shooter but I am not scared of recoil. My go to hunting rifles is a 404 Jeffery or a 458 express. I am not using a silencer. There is no material variance in the speed of the bullet if you look at the last two loads that I provided in my previous post.

I am now considering using 76.6 grain and adjusting the seating depth. For the same load seating out to 93.10 mm and with the same 76.60 grain seating the bullet deeper to 91.80mm. Does it make sense to tries this or do you think I should keep everything the same and try with a bipod?

Thank you

[Dale SH]

I really do not believe you have a reloading accuracy problem.
The fact that your first two shots touch each other tells me this.

The only way you going to resolve this is too shoot one shot and wait for the barrel to cool completely before you fire another.
Also try using a softer front rest and make sure there is no pressure on the barrel whatsoever.
Do not rest the barrel on the rest and do not apply any pressure on the barrel with your hand.

How many times can you fold a piece of paper and run it between the barrel and stock before you feel any friction between the paper and the barrel ?

Did you torque your action screws or did you perhaps over tighten them ?