turned 270 brass into 7mm08 brass?

[ironworkerwill]

A couple of weeks ago I picked up some 270 brass form a shooter at the range who didn't reload. I was going to srcap it but I desided to try and make 7mm08 brass.

After annealing, the process was rather easily done other than having to trim. I was rather pleased with the outcome! The brass weighed 186grns and IS the most consistant brass I own. Most of my other brass is around 160 with lots of variation.

I know I have decreased volume and increased neck thickness and a dummy round chambers fine, but it is a bit tight in the throat.

My question is: Will I need to turn the necks or will it fire as is with no issue? Also will a slower,lower pressure powder with a light 130grn bullet work best in the inital load?

 

[rsnell]

The 270 is based on the 30-06 case and the rim thickness is 0.049 inches. The 7-08 is based on the 308 case and the rim thickness is 0.054 inches. You can use a 308 case to form 7-08 cases but you will have trouble using a 30-06case to form 7-08 brass.

 

[ironworkerwill]

I've already formed the brass, and it cycles fine. The bolt head of my Savage is the same for .308 and .30-06 based ammo.

 

[steveno]

measure the neck of a 7mm loaded round that started life with a 7 mm case and compare it with one that was made from the 270 formed case. if they are the same then you don't have to turn the neck.

 

[ironworkerwill]

Yes, the neck is .321 and the other ammo I've loaded is around .313. It chambers snug. I may need to turn it a bit. I'm a little worried. I would like to see how it shoots and take advantage of the thick brass.

Since there is 15percent more brass should I use 15 percent less powder on my inital load?

 

[steveno]

it wouldn't hurt to turn the necks a little bit and yes you will have to work up a different load for the brass formed from the 270 brass. that is a problem when you have to do too much forming to make a case. in this case I wouldn't have done it. I would keep the load you use for the original 7 mm brass and come up with a totally different load for the formed brass.

 

[GLOOB]

I know I have decreased volume and increased neck thickness and a dummy round chambers fine, but it is a bit tight in the throat.

I assume you meant "tight in the neck" not the throat. This is worrisome, to me. This could mean higher pressures.

 

[ironworkerwill]

Gloob: Yes, the neck.

I turned all my necks last night and polished them with 000steel wool. I then measured the loaded neck dimention at .317. After marking and chambering the necks I see no radial scuffs around the necks.

15percent less case capacity will increase pressure. Will 45grns of Re17 and 130SieMK's do it?

 

[steveno]

you will have to low and work back up. most manuals say if you change components to back off 10 to 20 %. since you say there is a change in case weight I would back off 20% and work back up

 

[ironworkerwill]

It worked great. No pressure signs!