Any one got data for 7mm Dingato (7x300 WM)

[Jamie]

Just picked this up and looking for some load data or suggestions. The little I have found so far seems to be 75-77 grains of H1000 with the 180 Bergers. Anyone got anything else? Thanks for the help.

[yobuck]

finding load information for a wildcat cartridge can be difficult jamie.
i know nothing about your cartridge but i can tell you how i go about
finding loads for wildcats.
first off its best not to pay much attention to information you receive about
loads unless your sure of the source.
your gun will always be the beast source of information.
that said pick a powder/bullet combination you want to try.
load 1 round on the low/safe side of what you think will work.
then load others in 1 round i grain increments higher.
mark your cases with a marker so you dont mix them up.
shoot from the hip into a safe backstop and listen to your gun.
when you feel signs of a sticky bolt stop.
backoff the load and work from that point.
you now know the max load for that powder/bullet and havent wasted
your time and barrel finding it out.
try the same with each other combination you want to try.
that method also works with factory cartridges for those interested in getting
fast information on max loads in their gun.

if your cartridge is of similar capacity you might look at 7stw load data as a place to start.

[Jamie]

Thanks for the information. This isn't the first time I have messed with a wildcat but it is part of my process. If I get 5 people loading really close to the same then that may be a good place to look at the math and work with. I never take any one (especially on the interwebs) data source as fact.

[BobT]

There have been a lot of 7mm designs on the .300 Winchester case, you might look at the case capacities on the the ones with good, known data and start from there. I have been flirting with a 7mm Mashburn Super lately, there is quite a bit of information on it but some of the data is 50 years old :)

[yobuck]

ive been using a 7x300 weatherby for about 45 years and it is probably similar also.
early on h870 was one of the very few suitable powders. now however there are quite a few
that are better. ive only used the 162 hornadys in mine for long range hunting. for about the last
decade or more ive been using 7828 powder which gives me velocity in the 3350 range in my guns.
h1000 works also but i find better velocity with 7828. my guns are 9 twist barrels and that works well with the 162s.
ive not tried the heavier bullets but intend doing so. the 162s work very well on deer and the one long range bear
ive killed with them.

[TC260]

Maybe you already use one but a chronograph is very helpful when working on new loads with little data.

[Jamie]

Just in case anyone is curious, the load I settled on was 77 grains of H1000 pushing Berger 180 grain VLD Hunting at 3095 fps (3098, 3091, 3094 respectively). Tuesday I start working on my drops out to 1K.

[yobuck]

Just in case anyone is curious, the load I settled on was 77 grains of H1000 pushing Berger 180 grain VLD Hunting at 3095 fps (3098, 3091, 3094 respectively). Tuesday I start working on my drops out to 1K.

the spread sheet looks good jamie. it will be interesting to see if the numbers work out with the actual shooting.
what type unit are you using?

[Jamie]

It is a CED M2. I will find out tomorrow if the numbers correlate but I am sure they will.

[BobT]

Hey Jamie,

How are you coming along with this one?

Bob

[big50beowulf]

JAMIE please do tell us more.

[yobuck]

he gave you the velocity numbers with a 180. with that you can get all you need.

[Jamie]

What would like to know? It is like shooting a 243 AI as far as ballistics out to 1200 yards. I did slow it down a little, 3050 range. Simple to reload for.

[calib]

i don't know what version the dingato or what ever came from, but my 7-300 win is just that 300 win necked down to 7mm and fire i am running the 180's out of a 29" 1:9 twist barrel with an even 75 grains at 3170 that is all touching at 100 yards about 1/2 to 3/4 grain under pressure signs. i have shot a group at 1276 that was 1/2 moa great round and a hammer on rocks, i just had a blank made by benchmark with 1:8.5 twist for the big 190's and the 195 berg when or if it ever comes out

[yobuck]

i don't know what version the dingato or what ever came from, but my 7-300 win is just that 300 win necked down to 7mm and fire i am running the 180's out of a 29" 1:9 twist barrel with an even 75 grains at 3170 that is all touching at 100 yards about 1/2 to 3/4 grain under pressure signs. i have shot a group at 1276 that was 1/2 moa great round and a hammer on rocks, i just had a blank made by benchmark with 1:8.5 twist for the big 190's and the 195 berg when or if it ever comes out

75 gr of what may i ask?
i have several 7x300 weatherbys in which ive been using 162 hornadys since the 70s.
and also since i have lots of them. one is getting a little long in the throat so im going to test 175s and 180s in it.
ive been using 7828 with the 162s. im going to try h1000 and retumbo with the 180s also.
the stiff bolt test showed 79 gr (MAX) with retumbo and 77 gr (MAX) with h1000 and 180s in my rem 40x action.
that due to primer failure not the bolt stiffening.

[calib]

h 1000

[Jamie]

H 1000 is what I am using as well.

[big50beowulf]

For those of you doing 7x300 calibers, are you using factory barrels or are you putting something special (Shilen, Mcgowen, Lija, hart???) on the platform.

[yobuck]

barrel legnth can be an issue. most factory barrels would be in the 22 to 24" range.
i would think 26" would be about minimum in order to burn the powder.
i have 2 7x300 weatherbys. one is on a rem 40x single shot action with a 30" hart barrel.
the other is on a 700 rem action having a 26 3/4" factory rem 40x barrel which i lightend
up to make a carrying type sporter gun. i seat the 162 gr hornady bullets so that they fit
in the factory magazine. the gun dosent mind that at all and still shoots very well. i get the same
velocity from both barrel legnths using 162s and 7828 powder.

[big50beowulf]

barrel legnth can be an issue. most factory barrels would be in the 22 to 24" range.
i would think 26" would be about minimum in order to burn the powder.
i have 2 7x300 weatherbys. one is on a rem 40x single shot action with a 30" hart barrel.
the other is on a 700 rem action having a 26 3/4" factory rem 40x barrel which i lightend
up to make a carrying type sporter gun. i seat the 162 gr hornady bullets so that they fit
in the factory magazine. the gun dosent mind that at all and still shoots very well. i get the same
velocity from both barrel legnths using 162s and 7828 powder.

I am trying to understand, am I reading this correctly, the Hart barrel 30" is giving you the same velocity as the 26 3/4" factory barrel?

[calib]

i am running a 29" benchmark barrel and getting 3170 with it. i loaded up to pressure marks and went down 1/2 or 1 whole grain from there and thats where i am at now. i think i am 6 thousands off the lands and it is accurate. i had a cop sniper buddy yesterday shooting it to 540 and they where all right in a softball size area on rocks, but there was stuff flying all over when that 180 hits ill see if i can load it

[scpaul]

Years ago there was a tool similar to a slide rule called a "Powley calculator". I don't know if it is still made or if it has been up graded with the new powders.It would suggest powders & starting amounts for ctgs. Paul

[yobuck]

I am trying to understand, am I reading this correctly, the Hart barrel 30" is giving you the same velocity as the 26 3/4" factory barrel?

yes thats what im saying. which means a 28" barrel will suffice in the large 7mms if using the proper powder. im using 7828 in mine.
that gives me the best velocity/accuracy combination in my guns. we have also tested other bullets including 180 bergers in both the
7x300 weatherby and the 7mm ultramag. we find the 162 hornady will beat the 180 berger to about 1200 yds for trajectory.
energy isnt the factor for us anyway as by that point were using better guns.

[yobuck]

Years ago there was a tool similar to a slide rule called a "Powley calculator". I don't know if it is still made or if it has been up graded with the new powders.It would suggest powders & starting amounts for ctgs. Paul

that would have been homer powley. i knew homer powley having spoken with him numerous times by phone.
he was a balistician who worked at the frankford arsenal in philadelphia. we take so much for granted today
with all the choices we have by way of powders and such. say 40 years ago or more that wasent the case.
there was a fair ammount of "experimenting" that went on. duplexing was the common name for it.
after he retired homer was sort of a go to guy for various wild ideas.

[GaryB]

Years ago there was a tool similar to a slide rule called a "Powley calculator". I don't know if it is still made or if it has been up graded with the new powders.It would suggest powders & starting amounts for ctgs. Paul

I still have mine somewhere. It is online now also...

http://kwk.us/powley.html

Good luck!
GaryB