H4895 reduced loads 175gr 7mm instability

[Ringostar]

If you seriously want reduced loads, you should also use lighter bullets. Look at 140 and lighter. Midway has blems in that range also.

 

[crustyrusty]

If you seriously want reduced loads, you should also use lighter bullets. Look at 140 and lighter. Midway has blems in that range also.

so what do i do with the 1200 bullets that i have?

 

[dellet]

so what do i do with the 1200 bullets that i have?

First determine exactly what you have. Then you can make some sort of decision.

Knowing length, construction and color of tip might help I’d them. Maybe even a part number from Midway. At that point you can decide if they are something you can use, or if you want to sell them, you will know what you are selling.

The problem is that a decent bullet 1.450” long, 175 grains at 2000 fps in a 1/9.5 twist, in theory should be making oblong holes at 100 yards at worst. Not hitting sideways. If it has a plastic tip, It should be even better. They would be perfectly good as steel target shooting within a couple hundred yards, unless you are using a suppressor. Figuring what’s going on with these might save some frustration in the future. Part of that will also be getting an accurate velocity as well.

Some short range, carefree shooting with a light load would probably help your flinch a lot. These might end up being perfect for that.

 

[crustyrusty]

First determine exactly what you have. Then you can make some sort of decision.

Knowing length, construction and color of tip might help I’d them. Maybe even a part number from Midway. At that point you can decide if they are something you can use, or if you want to sell them, you will know what you are selling.

The problem is that a decent bullet 1.450” long, 175 grains at 2000 fps in a 1/9.5 twist, in theory should be making oblong holes at 100 yards at worst. Not hitting sideways. If it has a plastic tip, It should be even better. They would be perfectly good as steel target shooting within a couple hundred yards, unless you are using a suppressor. Figuring what’s going on with these might save some frustration in the future. Part of that will also be getting an accurate velocity as well.

Some short range, carefree shooting with a light load would probably help your flinch a lot. These might end up being perfect for that.

yeah I have a subscription with AllData.com and I just found data for the 175gr bullet (generic) that uses 32gr of IMR 4320 for 2150fps start load..so I will try that!! if it pans out that will be my goto powder combination...the only thing that AllData doesn't do is give either PSI or CUP pressure with there data

 

[crustyrusty]

yeah I have a subscription with AllData.com and I just found data for the 175gr bullet (generic) that uses 32gr of IMR 4320 for 2150fps start load..so I will try that!! if it pans out that will be my goto powder combination...the only thing that AllData doesn't do is give either PSI or CUP pressure with there data

oppps just realized i said alldata its actually LoadData.com!!

 

[crustyrusty]

well after a lot of load development of laddering up until these super long bullets get stability it took full power loads to get fully stabilized ,, starting at roughly 2600 fps and above... so I gave them all away to my buddy to use in his 7 mag. my 175gr round nose are just beautiful accurate at 1800-1900fps and so are my 174gr FMJ Prvi-Partizan bullets....so I am putting in a order for 400 more 174gr FMJ and I have 600 of the round noses on hand

 

[expiper]

hey guys since my first post looking to Slow my rounds down so I could better enjoy my shooting experience with my 280 Remington all of the great information gleaned from here was a total wonderment and awe as to the knowledge and intelligence the collective we have here on this forum
is just staggering.. so I come to you once again looking for understanding and insight as to what I have come across.. Ok first thing first while on Loaddata .com researching good loads with H4895 for 168gr and 175gr bullets for my 280 was a slim picken at best …. but there were loads for them nonetheless and I used the 60% rule to establish my rock bottom load.. from there I added 2grs just for G.P. that turned out to be a total of 30.5gr of H4895. so I put together 20 rounds of 175 gr Hornady round noses and 20 rounds of 175gr Hornady SST's. When I got to my range to shoot,, My first target was at fifty yards and bullet of choice was my round nose.. the first 5 rounds printed a nice 3/4 inch maybe 1 inch group and I took it to 100 yards. first group was 1-1/2 5 round string...ok round noses did just fine,, Next up are the SST's When driven to 2700fps out of my rifle I get really good groups of 3/4 inch at 100 yards So now I pull the trigger on the SST's and I actually hear a THUMP.. so I go look at the target..... every round was a KEYHOLE on the target at fifty yards!!! ok so here is the question.... why would this projectile be so accurate at 2700fps and keyhole at 2100fps? it doesn't make sense the round nose didn't care what speed it was traveling it performed flawlessly fast and slow but the SST? not so much,,,, has anybody ran into this issue before?

turn the bullet around backwards and it should stabilize,,,,,Roger

 

[crustyrusty]

turn the bullet around backwards and it should stabilize,,,,,Roger[/QUO
You know I actually saw a you tube video that did just that!! that was a great video!! that bullet was greatly more dangerous backwards than frontwards thats for sure.. I found a solution to my problem,,,,,,I pulled All of those bullets and just gave them to my shootin buddy who has a 7mm Mag... there good riddence now I can move on to other bullets that will work

 

[crustyrusty]

so I went to lymans 49th edition and they list a lead gas check 168gr at 1800fps with 30gr H4895 and thats where I "barrowed" the data to use with the 175gr stuff. so according to that loading I actually need to go up several grains to get to my target speed of 2200-2300fps

since this posting I have come across published H-4895 data for the 175gr spitzer and Quick Load data as well using H-4895

 

[Zero333]

Higher velocity equals higher RPM.

The Higher the RPM the more stable the bullet.

So, slower velocity means the bullet is not spinning as fast and is not as stable.


How long are these 175 grainers ???

Have you confirmed the twist of the barrel with a cleaning rod and nylon brush ?

 

[crustyrusty]

yep! the 175's that I had a problem with were extremely long.. I dont have any left to measure but according to the calculator um jbm or jbl anyway 1.3 was minimum for a stabil bullet and these ran 1.35 according to the calculator. so they were marginal at best,,, I had like 1100 or 1200 of the darn things and I wasn't gonna spend anymore time in trying to make them fly slow... they worked great at top speed tho!! the recoil was tough and thats the reason why I wanted to go slow. a 175gr at 2200fps is actually a joy to shoot, and my supply of 174gr FMJ flew just great at 2100-2200fps..... now I have a new barrel to break in when they get done with it and I will still shoot slow but I will also shoot velocity to hammer targets at 600yards and beyond.

 

[crustyrusty]

I gave away all of those long bullets to a buddy of mine he has a 7mm magnum and he reports that they are very accurate out of his gun